TIC T-33B Operations Manual

TIC T-33B Operations Manual
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T-33B/C/D
AIR TRANSPONDER
RAMP TEST SET
REV. A
October 26, 1998
"'
TEL - INSTRUMENT
ELECTRONICS CORP.
T-33B/C/D
AIR
TRANSPONDER
RAMP TEST SET
WARRANTY
The Tel-Instrument Electronics Corporation warrants each new product
manufactured by it to be free from defective material' and workmanship and agrees
to remedy any such defect or to furnish a new partin exchange for any pare of any
unit of its manufacture which under normal installation, use and service discloses
such defect, prQvjded the unit is delivered by the owner to us intact for our examination with all transportation charges prepaid to our factory within one year from
the 'date of sale to original purchaser and provided such examination 'discloses,
in our judgment, that it is thus defective. This warranty does not include tubes or
batteries.
This warranty does not extend to any of our products which have .been
subjected to misuse, neglect, accident, incorrect wiring not our own, improper
installation, or to use in violation oJ, instrUctions furnished by us, nor extend to
units which have been repaired or alt\!red outside of our factory, nor to cases
where the serial number thereof has been rem.oved j defaced or changed, nor':to
accessories used herewith not of our own mariufactur'e.
Repair parts will be madeavailabl,e for a minimum period oCfive (5)
years after the manufacture of this equipment has been discontinued.
,
"
This warran ty is in lieu of all either warninties expressed or implied and
no representaci ve or person is au thorized, to assume for us any other liability in
con'neccio'n with the sal~ of our products.
'
ADDITIONAL INFORMATION with regard to the applications and maintenance ~f'th'is equipmeh~ will be llvllilable from time to time. Users of our instruments are urged to discuss their'problems with us and to suggest such modifications as might make them more adaptable to their special requirements.
,THANK YOU
.'
TIC
AVIONIC TEST EQUIPMENT FOR BENCH AND RAMP
MAHU£AcrURERS Of £LECIAOt1lC TEST (QUIPMI:.,HT SINCE 1,!!41
f'non'112011 IiIll·1600
NOT E
This combined manual covers both the Type T-33B and T-33C instruments.
and external appearance of these instruments are identical.
Performance
Due to the fact that manufacturers are discontinuing the 74L series of IC it was necessary to change over to the 74IS series. Since the pin connections on the 74L and 74LS
series are different/printed circuit board changes were required on the Encoder,
Decoder, Translator and Attenuator boards. A change of Model number from T-33B
to T-33C is a logical way to differentiate between instruments using the two different
series of IC' s. We have a sizable stock of 74L series IC' s to take care of repair
requirements for the T-33B.
The circuit diagram in this manual is entitled T-33C; however, a pin connection diagram for the 74L series IC is shown at the right hand top corner of the schematic.
The same circuit diagram is thus usable for both units.
Parts list change for the T-33C i.s as follows:
Page 4 - 26 Encoder Board
,;'
ITEM
-
DESCRIPTION
19
20
·21
22
IC
IC
IC
IC
SN74LSOON:
SN74LS04N:
SN74LS10N:
SN74LS95BN:
T-I
T-I
T-I
T-I
TIC PART #
CIRCUIT DESIGNATION
QTY
IC3
IC2,12
ICll
IC4 - 10
1
2
1
7
CIRCUIT DESIGNATION
m:r.
TIC PART II
1
1
5
TSN74LSOON
TSN74LS04N
TSN74LS95N
CIRCUIT DESIGNATION
QTY
TIC PART II
IC34
IC32,35
IC33
IC37, 38,45
IC30, 31,44
1
2
1
3
3
CIRCUIT DESIGNATION
QTY
TIC PART II
IC52
1
TSN74LS03N
TSN74LSOON
TSN74LS04N
TSN74LS10N
TSN74LS95BN
Jlage 4 - 29 Decoder Board
ITEM
DESCRIPTION
8
9
10
IC
IC
IC
SN74LSOON:
SN74LS04N:
SN74LS95N:
T-I
T-I
T-I
IC13
ICl4
IC15 - 19
Page 4 - 33 Translator Board
ITEM
3
4
7
9
11
DESCRIPTION
IC
IC
IC
IC
IC
SN74LSOON:
SN74LS02N:
SN74LS08N:
SN74LS83AN:
SN74LS86N:
T-I
T-I
T-I
T-I
T-I
TSN74LSOON
TSN74LS02N
TSN74LS08N
TSN74LS83AN
TSN74LS86N
Page 4 - 39 A ttenua tor Board
ITEM
9
DESCRIPTION
IC
SN74LS03N
T-33B INSTRUCTION BOOK ADDE NDUM
The following paragraphs provide additional information fOT use of the T-33B using
the direct connection as outlined in section 2.2 of this manual.
Reference:
Federal Aviation Administration Advisory Circular number 43-6
dated September 19, 1974, paragraph 6.
The transponder receiver sensitivity measurement (MTL) as outlined by Advisory
Circular 43-6 is made with the transponder replying to 90% of the interrogations of
the T-33B. Many transponders tend to delay the timing between P3 and Framing One
pulses as the received interrogation approaches MTL. This shift in timing can be
0.5 microseconds or more, and may be sufficient to exceed the maximum permissible
delay of 30 5 microseconds. Under this condition the T-33B decoding circuitry will
not indicate the correct code or altitude. This is not a defect in the T-33B. The
test set is indicating that Framing One pulse of the transponder reply is delayed more
than 3.5 microseconds after P3 of the interrogation, and the transponder is out of
spec. Note that paragraph 6 of Advisory Circular 43-6 does not require that any code
checks be made when measuring receiver sensitivity.
It is recommended that all checks with respect to codes be made with the REPLY/SLS
switch of the test set set to the LEVE L position. This will provide a signal strength
of several dB above MTL.
The pulse timing between P3 and Framing One pulses can be conveniently measured
by examining the waveform at the Video test point on the front panel of the test set.
The T-33B I. F. circuit has a typical delay time of 0.15 microseconds, and this factor
must be subtracted from the measured delay time to arrive at the actual delay time of
the transPonder. For example, if the measured delay as indicated by the oscilloscope
was 3.3 microseconds, the actual delay time would be 3.3 - 0.15 or 3.15 microseconds.
I AI:S.LI:.
Ut"
L.UI'.! I 1:.l'J I ;:,
T-33B AIR TRANSPONDER
RAMP TEST SET
SECTION 1
1.1
1.2
1.3
SECTION 2
2.1
2.2
2.3
·SECTION 3
3.1
3.2
SECTION 4
4.1
4.2
4.3
4.4
4.5
DESCRIPTION
PAGE
General
Specification
Front Panel Controls
1 - 1
1 - 2
1 - 3
OPERATION
General
Operation Using Direct Connections
Battery Recharging
2 - 1
2 - 4
2 - 5
THEORY OF OPERATION
System
Functional Description
3
1
3 - 1
TROUBLE SHOOTING AND MAINTENANCE
General
Disassembly
Maintenance Adjustments
Trouble Shooting
Photos, X-Rays, and Parts List
Code-to-Altitude Conversion Chart
Altitude-to-Code Conversion Chart
Main Schematic
Readout Schematic
4
-
1
1
4 4 - 2
4 - 7
17
4
-
DESCRIPTION
1. 1
GENERA L:
The T-33B is a battery powered, portable test set which enables one man to perform
transponder operational checks directly from the cockpit of an aircraft. This is
accomplished by radiating an interrogation signal to the antenna of the unit under test
and observing the decoded reply on four Numitron display devices. The T-33B digital
readouts can display the decoded reply in three forms, front panel selected: PILOT
CODE, BINARY CODE, and ALTITUDE in feet.
The'T-33B is also capable of malting transponder receiver sensitivity measurements
by means of a direct conneCtion between the transponder and test set. A BNC connector,
located next to the antenna connector, has been provided for this purpose. In addition,
a video test point has been provided on the front panel which allows both interrogation
and reply pulses to be displayed on an oscilloscope. This feature, together with the receiver sensitivity measurement capability of the T-33B, allows the lmit to be used as a
limited, but valuable bench test set.
The PILOT CODE readout is used on Mode A to enable the T-33B to display the transponder control head setting as set by the technician. It also finds use in Mode C
operation for error checlting. The ALTITUDE readout is used on Mode C when testing the altitude digitizer in the aircraft. In this case, the T-33B will indicate the altitude in feet as received by a ground station interrogating the transponder on Mode C.
The BINARY CODE readout provides a display of the actual A, B, C and D pulses contained in the reply pulse train. The teclmician may select any of the three decoded
forms on all modes, as desired.
In addition to the decoded reply, the display of the T-33B indicates the presence or
absence of the Framing pulses, X pulse, and Ident pulse. These are the "decimal
pOints" below the A, B, C and D digits.
of
All 4096 codes (8192 codes with X pulse) can be checked in a matter
seconds by
setting the transponder to two complimentary codes. A pair of complimentary codes
are those whose sum adds up to 7777, such as 3333 and 4444, or 0707 and 7070. This
check will verify that all pulses can be turned on, and all pulses (except Framing) can
be turned off.
The 1030 MHz R. F. interrogation signal is generated by a crystal controlled transmitter
with a frequency accuracy of ± 0.01%. The 1090 MHz transponder transmitter frequency
is checked by a direct reading dial calibrated to an accuracy of ± 0.5' MHz. This is
accomplished by incorporating a superheterodyne type receiver with a tuneable integrated
circuit I. F. section. Tuning range is ± 6 MHz.
The T.>.33B will interrogate a transponder on Modes A, B, C, D and military Modes 1,
2 and 3. The side lobe suppression pulse level is normally 9 dB below PI and P3, and
can be transmitted equal in amplitude to PI and P3 (0 dB) to check the SLS circuits of
the receiver. The front panel meter of the T-33B provides a percentage readout of
transponder response to interrogations with the SLS pulse at -9 dB level and SLS pulse
at 0 dB level. Full scale of the meter is automatically switched from 100% to 10% as
the SLS pulse is activated.
T-33
1 - 1
_ - - - - - - •• 0
_ . _ _ ~"LJ U~ ,u" ~-"".D IS entirely digital, providing extreme accuracy and reliability of operation. The unit is powered by rechargeable
Ni-Cad cells with a built-in charger. Ie voltage regulator circuits in the unit deliver constant voltage to the circuits thus eliminating deterioration of performance
due to falling battery voltage. A front paneJ",battery condition meter monitors the
status of the voltage regulators and indicates when recharging is necessary. This
permits the' technician to check battery condition before transporting the unit to the
check area. The battery can be completely recharged in 14 hours and the charger may
be left in operation indefinitely with no damage to the battery or test'set. The AC
power supply in the T-33B will provide sufficient power to operate the unit while
charging the battery. Thus, it is not necessary to charge the battery before operatin!j the unit if A C power is available at the _test site.
1. 2
(
SPECIFICATIONS:
TRANSMITTER:
1030 MHz ± 0.01%, crystal controlled
TRANSMITTER PULSE RATE:
235 pps nominal
INTERROGA TlON PULSE SPACING:
"sec, corresponding to Modes I, 2, 3/A, B, C, and D,
3 5 8 17 21 and 25 ~
front panel selected.
!
,
"
SLS PULSE:
SLS OFF - P2 9 dB below Pl, 2 Usec pulse spacing
SLS ON - SLS pulse amplitude Pl amplitude, 2 IJsec pulse spacing
=
TRANSPONDER FREQUENCY CHECK:
1090 MHz ± 6 MHz, ± O. 5 MHz accuracy
TRANSPONDER SENSITIVITY MEASUREMENT:
-65 dBm to -83 dEm, accuracy ± 2 dB
REPLY RA TE MEASUREMENT:
0-100% full scale withP2 9 dB below Pl ( -9 dB )
0-10% full scale with P2 = PI ( 0 dB )
VIDEO OUTPUT:
1 volt pulses into a 50 ohm load
POWER SUPPLY:
Seven 1.2 volt Ni-Cad cells with charger operated from 115/230 volt
50 - 400 Hz AC power source
TEMPERATURE RANGE:
10' to 40' C operational
.;q:
SIZE:
lot" W x 8~" H z ~" L
, (Less antenna and handle)
WEIGHT:
14 lbs.
1 - 2
1. 3
FRONT PANEL CONTROLS
A.
POWER Switch S5
A spring loaded toggle switch controls battery power to the wlit.
B.
BATTERY CHECK Meter (Ml)
A miniature meter with the left half of the scale red and the right half white
monitors the status of the voltage regnlator, and indicates when battery recharging is necessary. When the battery is fully charged, the indicator will
move to the extreme right hand side of the scale. As the battery terminal voltage falls the needle will move toward the left. When the needle enters the red
area of the scale, the battery is exhausted and should be recharged,
C.
READOUT Switch (S4)
This three position toggle switch controls the operation of the display circuitry
of the twit. The FRAMING, X and lDENT readouts are not affected by the position of this switch. The T-33B display circuitry will not operate unless both
Framing pulses are present in the reply pulse train. The PILOT position of
this switch is used on Mode A and provides a display of the transponder control
head setting. The A LTITUDE position is used on Mode C and indicates the altitude in feet. The BINARY CODE position is used on both Modes A and C and
indicates the actual pulses in the respective reply pulse train.
D.
RECEIVER SENSITIVITY Potentiometer
This control serves two functions in the unit. With the REPLY/SLS switch in the
LEVEL position the RECEIVER SENSITIVITY potentiometer controls the gain of the
T-33B receiver, and thus the level of receiver output. Adjustment of receiver
output level as indicated by the meter allows the teclmician to peak the tuneable
1. F. amplifier and read transmitter frequency.
With the REPLY/SLS switch in either PERCENT position the RECEIVER SENSITIVITY control provides an adjustment of the variable attenuator of the T-33B.
This feature is used only when malting transponder receiver sensitivity measurements with a direct connection between the T-33B and transponder under test.
E.
1090 MHz Potentiometer (R22)
This potentiometer varies the bias voltage on a pair of varactors in the 1. F.
amplifier, thus tuning the receiver over a range of 1090 MHz ± 6 MHz.
F.
R'EPLY/SLS Switch
This is a three position toggle switch which controls both the meter readout and
T-33
1 - 3
SLS pulse of the T-33B. The lower position of this switch allows the meter to
indicate the level of receiver output while transmitting interrogations with the
SLS pulse 9 dB below PI and P3. This position is used when malting transponder frequency measurements and all checks with respect to codes.
The center position of this switch is used when it is desired to read the percentage reply of the transponder with the SIB pulse at 9 dB below PI and P3.
Full scale reading is 100%. If a direct connection to the transponder is being
used it will be necessary to adjust the Receiver Sensitivity potentiometer to a
point equal or greater than minimum triggering level (MTL) of the transponder.
The upper position of this switch, 10% reply /0 dB, increases the level of the SLS
pulse so that it is equal in amplitude to PI and P3. It also increases the sensitivity of
the meter so that full scale is a reply rate of 10%. When the T-33B REPLY/SLS switch
is operated in this position the transponder reply rate should not be more than 1. 3%.
G.
MODE Switch (S3)
This rotary switch selects the time delay between PI and P3, and thus the interrogation Modes 1, 2, 3/ A, B, C and D.
H.
MICROAMMETER (M2)
This meter serves two functions depending upon the position of the REPLY/SLS
switch. With the RE PLY/SLS switch in the LEVEL position, the meter indicates
relative T-33B receiver output. When malting code checks the Receiver Sensitivity potentiometer should be set to the maximum clockwise position so that
the meter reads full scale. This indicates that there is sufficient receiver output to activate the decoding circuitry of the T-33B. When transponder frequency
.measurement is desired, the Receiver Sensitivity potentiometer is adjusted so
that the meter reads about 1/4 full scale. The 1090 MHz control can then be
peaked to read transmitter frequency.
With the REPLY/SLS switch in the 100% or 10% pDsition the meter will read the
ratio of reply rate to interrogation rate expressed as a percentage. Full scale
reading of the meter is 100% and 10% respectively.
I.
VIDEO TEST POINT (Video and Gnd)
This test point provides means to display both interrogation and reply pulses on
an Dscilloscope. Connection to the oscillDscope may be made either by using a
standard 10:1 divider probe, Dr by feeding directly to' the oscillDscope thrDugh a
coaxial cable. If a cDaxial cable is used terminate the end of the cable at the
oSCilloscDpe end with a 50 ohm load resistDr.
J.
NUMITRON READOUTS (VI, V2, V3 and V4)
The Numiiron readouts are digital display devices which provide a sharp, high
brightness display cDnsisting of a segmented digits. v,'hen the READOUT switch
of the T-33B is set to the PILOT position, the readouts will display the decoded
reply pulse train in the form of four digits. When the READOUT switch is set to
the BINARY position the three horizontal segments of each readout will indicate
the presence Dr absence of each binary reply pulse. Refer to Figure 1 - 1.
1 - 4
A
B
C
D
I
I
2
2
4
X
FRI
BINARY
4
X
X
FR2
DISPLAY
IDENT
OF 1764 CODE
FI G. I-I
Illumination of the uppermost horizontal segment of the readouts indicates
the presence of the AI, BI, 01 and DI reply pulse. Similarly, illumination
of the center horizontal segments indicates A2, B2, 02 and D2 or the lower
horizontal segments A4, B4, 04 and D4.
Illumination of the decimal point of the readouts indicates the presence of
the FRAMING 1, X, FRAMING 2 and !DENT pulses, and will be indicated
for any position of the READOUT switch.
When the READOUT ,switch is in the ALTITUDE position, the readouts will
display the decoded altitude in hundreds of feet. Adding the two silk screened
zeros on the front panel to the display provides the altitude reading in feet.
T-33
1- 5
--_ .. _.,
-
OPERATION
2,1
GENERAL:
A transponder with altitude reporting capabilities may be checked in only a few minutes
with the T-33B, The interrogation signal may be radiated from the cocl\pit or directly
fed into the transponder antenna connector with a 50 ohm coaxial cable. To make radiated checks remove the TNC protector cap at the top of the llllit, Remove the antenna
fro!!) the cover of the unit and attach it to the TNC antenna connector. If a direct connection is desired do not attach the antenna. Instead use a 50 orun coaxial cable with
a B NC plug at one end, and suitable connector at the other end for the transponder.
The attenuation of tlils cable, at 1 G Hz, must be known if accurate receiver sensitivity
checks are to be made, When malting checks with the 50 ohm cable be sure the TNC
protector cap is attached to the TNC antenna connector, If this is not done the T-33B
will radiate and may cause erroneous measurements,
Use the following procedure:
CA UTION: Do not dial any PILOT COD E starting with 77,
ground station alarm,
2,1.1
To do so may activate a
Mode A - B Tests:
A.
Turn the transponder on and allow at least one minute warm-up. Connect the T-33B antenna or make a direct connection between the T-33B
BNC jack and transponder antenna jack,
CAUTION: The TNC jack is to be used ONLY for radiated checks with
the antemla, If a transponder is connected to this jack the
T-33B will be damaged,
B,
Set the T-33B controls as follows:
RECEIVER SENSITIVITY
1090 MHz
REPLY/SLS
MODE
READOUT
C,
Turn the T-33B on, Ascertain that the BATTERY CHECK meter is in
the white portion of the scale, If not, recharge the battery from a 115
VAC 50 - 400 Hz source, NOTE: It is permissible to operate the T-33B
while the unit is being charged by any 115 volt, 50 - 400 Hz power source,
D,
Adjust the location of the T-33B to obtain maximlun deflection of the
microammeter to determine if the transponder is being interrogated, If
available, the reply lamp of the transponder can help to determine that
the transponder is replying to the interrogation of the T-33B. Meter
2 - 1
T-33
maximum clockwise
zero
LEVEL
A or B
PILOT
readings of less than full scale indicate that the T-33B antenna is in a
weak signal area. Erratic meter readings indicate that the transponder
is n<;>t replying to every interrogation of the T-33B and the transponder
is receiving a weak signal. This can be verified by throwing the RE PLY
LEVEL switch to the 100% position. Readings under 100% indicate that
the transponder is not replying to every interrogation of the T-33B. It
may be necessary to change the position of the T-33B to achieve sufficient signal strength. The T-33B meter must read at least full scale
for proper operation of the decoder circuitry.
E.
Adjust the RECEIVER/SENSITIVITY control so that meter deflection
is about 1/4 scale. Adjust the 1090 MHz control on the T-33B for
maximum meter deflection. Best resolution of this adjustment is
made at 1/4 scale or less; adjust the T-33B sensitivity acoordingly.
Read transmitter frequency error directly from the dial. Maximum
error permissible is ± 3 MHz.
F.
To check transponder reply rate throw the RE PLY/SLS switch to the
100% position. The T-33B meter now indicates the reply rate as a
percentage of the interrogation rate, with full scale of 100%. A properly operating transponder must reply with a rate of 90% or greater.
Note that the T-33B readout indicates the presence of Framing pulses
in the l' eply .
G.
To check the SLS circuits of the transponder throw the REPLY/SLS
switch to the 10%/0 dB position. The meter, with full scale equal to
10%, should read 1. 3% or less for a properly operating transponder.
Note that the T-33B readout extinguishes, indicating that the transponder is not replying to the interrogation.
CAUTION: Some transponders, when receiving a signal near MTL
(minimum triggering level), may transmit a reply even
though the SLS pulse is present in the interrogation. If
a reply is received with the SLS pulse at 0 dB, repeat the
SLS test with the T-33B placed closer to the transponder
antenna to increase the signal strength.
H.
Turn SLS to -9 dB. Push the READOUT switch to PILOT and note the
indication of the presence of the Framing pulses. Push the transponder
IDENT button and note the presence of the Ident (SPIP) pulse.
I.
Rotate each dial of the transponder control head through all positions
and note that the T-33B indicates the same as the control head setting.
CAUTION:
Do not dial any code starting with 77.
activate a ground station alarm.
2 - 2
To do so may
2.1,,2
Mode C: Altitude Reporting
A.
To check the altitude reporting system, it is best to determine
first if the Mode C portion of the transponder itself is properly
operating. To do this, discOlmect the altitude digitizer from the
transponder and connect a pilot code switch box * in its place.
Set the transponder and T-33B for Mode C or Altitude Reporting
operation. Note the deflection of the T-33B meter and presence
of Framing pulses indicating that the transponder is replying to
the interrogation.
Set the T-33B READOUT switch to PILOT. Rotate each dial of
the pilot code switch box through all positions and note that the
T-33B indicates the same as the pilot code switch box setting.
B.
Once step A is completed, the only component left is the altitude
digitizer. COlmect it to the transponder. Setup an Altitude/Airspeed
Simulator to the static and pitot source. Throw the READOUT
switch on the T-33B to the ALTITUDE position. Operate the
vacmun pmnp to any desired altitude and note the display of the
T-33B. The T-33B is capable of checking any altitude from
-1200 feet to 126,700 feet.
If the vacuum is gradually increased from ground level pressure,
the T-33B readout may be watched to determine if there are any
errors, as the readings will increase in nmnerical order. Any
nmnbers appearing out of order would indicate a digitizer error.
(For example, readings of 145, 146, 147, 146, 145 would indicate
a broken Al wire, or defective Al circuit in the digitizer.)
For smaller general aviation aircraft where an Air Data Computer
is not used, only the aircraft's static source is connected to the
Altitude Simulator's vacumn source. The pitot. (pressure) lines
need not be used for altimeter encoder checks.
By performing step A before step B, the fault in a defective altitude
reporting transponder is thus isolated to the section where the problem lies - with the Altimeter/Encoder or the transponder itself.
If step B is performed first, all that can be determined is that the
transponder.£E digitizer is defective.
c.
A pilots "squawk sheet" which includes the altitude at which the ground
station reported erroneous altitude would reduce the fault isolation time.
Dissemination of tIns information by the flight crew would provide the
teclnli.cian with valuable trouble shooting information. Those altitudes
reported to be in error can be immediately selected and verification of
their inaccuracies could be established. Needless to say, a system
wired so that the Altimeter/Encoder's output is connected to either of two
transponders is also an aid. Having eliminated the transponder as the
*
T-33
Box and switch wired to activate A, B, C and D bits.
2 - 3
error source, the actual altitude or altitudes which the ground station
reported as erroneous should give the technician a clue to the nature
of the Altimeter/Encoder's malfunction.
Do
In order to compare digitizer altitude with the readings of the pilot's
altimeter, it is essential that the altimeter barometer correction be
set to 29 092 ino Hg o , as the digitizer is permanently set to that reference.
When the T-33B altitude readout in feet does not agree (within the
acceptable limits) with the altitude readout of the Altitude Simulator
or Altimeter/Encoder the READOUT switch should be set to the PILOT
positiono In Mode C this now reads the modified Grey (Altitude) code o
All altitude points where disagreement occnrs should be·noted on papero
With the aid of the ALTITUDE-to-CODE and CODE-to-ALTITUDE
charts supplied in the cover of the T-33B the error of the altimeter's
encoder can be quickly determined o Example: Missing A, B, C, D
bit info, additional bit info, or transposed bit, etco
Eo
For your convenience the T-33B has been designed so that if invalid
Co, 5, or 7 codes are present 400, 000 feet is added to the altitude
reading. lf invalid D 1, 3, 5, or 7 codes are present 200,000 feet is
added to the altitude reading. Correspondingly if both erroneous C and
D codes are present 600, 000 feet will be added to the altitude reading o
When there is no Mode C information, such as would occur with a disconnected digitizer, the T-33B altitude readout will be 4007 0 This can
be verified by setting the T-33B readout switch to PILOT 0 A display
of 0000 will be indicated.
202
OPERATION USING DIDECT CONNECTIONS:
The T-33B may be operated using a direct connection between the T-33B BNC jack and
the unit under test o The purpose of using a direct connection is twofold: It is necessary to use the direct connection when transponder receiver sensitivity checks are to
be made, and the direct cOllllection may be used when it is lmdersirable or not possible
to make radiated checks. Caution: Never make a direct cOlmection between the T-33B
TNC jack and Ullit under testo To do so will damage the T-33B. To make a direct
connection "to the T-33B it will be necessary to gain access to the antenna jack or antenna cable of the transpondero Some lmits, such as the King KT-75, use cabinet
mOlUlted R. F. and power COllllectors. In order to make a direct connection to this type
of installation it will be necessary to obt..'lin a suitable jumper cable to make the power
connection, and an H. Fo COlmector and cable to mate with the antelma jack on the transponder and the T-33B. The attenuation of this cable, at 1 Gc, must be Imown if accurate
receiver sensitivity checks are to be madeo A four foot section of RG5S/U cable, for
example, will have an attenuation of about 0.7 dB. Also, R. F. COlmector must be properly assembled with correct lead lengths or additional attenuation may occur.
CA UTION: Do not make transponder frequency checks using the direct cOlmection. The
transponder frequency may be dependent upon the load that the transmitter
sees. Frequency measurements must be made with the transponder operating
into its own antelUla.
T-33
2-4
i
Operate the T-33B with the REPLY/SLS switch in the 100% position, and adjust the
RECEIVER/SENSITIVITY control for a meter reading between 90 and 100%. The
RECEIVER/SENSITIVITY control will then indicate the sensitivity of the receiver.
Verify that 'the difference in sensitivity between Mode A and Mode C does not exceed
1 dB.
Throw the REPLY/SLS switch to the 10% position and verify that the reply rate is
1. 3% or less.
2.3
BATTERY RECHARGING
The BATTERY CHECE meter in the T-33B will give a constant indication of the
condition of the battery in the lmit when the POWER switch is on. A fully charged
battery will deflect the meter to the right hand side of the scale. As the battery
terminal voltage decreases with use, the needle will move towards the red area.
When the needle enters the red area the battery is discharged and must be recharged.
It is recommended that, fOT best battery life, the T-33B not be operated until the
batteTY is exhausted. This is due to the fact that when the depth of discharge is very
deep, some cells will be neal' a zero state of charge. In this condition the possibility
of an internal ShOTt in the cell is much greater than in a partially charged cell, since
a chaTged cell can vaporize a ShOTt circuit as it is forming.
It is especially impoTtant not to run the battery down to terminal voltage well below
the point when the battery check meter enters the Ted aTea of the scale. Tins will
occur if the spTing loaded power switch is defeated so that the unit remains on even
though the batteTY needs rechaTging. If this is allowed to happen the cells which become depleted first will be reverse chaTged by the Temaining cells, and could be permanently damaged.
To recharge the battery plug the line cord into any 1.15 volt 50 - 400 Hz line. Full
recharging takes about 14 hours. TheTe is no danger of overcharging the battery if
the chargeI' is left on indefinitely.
The T-33B is supplied with seven 1. 2 volt Ni-Cad cells, which will give about 3 hours
continuous' duty (with the readouts illuminated) before they must be recharged. A
pilot lamp near the line cord connectoT indicates that the chargeI' is operating. It is
not necessaTY to chaTge the battery to opel' ate the lillit. Simply plug the line cord into
any 50 - 400 Hz 115 volt poweT SOUTce and operate the unit in the normal way. The
chaTging circuit will provide sufficient power to operate the unit while simultaneously
charging the batteTY.
T-33
2 - 5
CA UTION: If it is desired to operate the unit from a 230 volt source, change the
wiring to the primary of T2 as follows:
4
3
230 VOLT INPUT
115 VOLT INPUT
This change may not permit the T-33B to be charged in the aircraft as the majority
of large airplanes supply 115 volts AC, not 230 volts. If the T-33B Ni-Cad cells
are only partially charged the BATTERY CHECj~ meter will indicate satisfactory
batt'3ry voltage because of their excellent voltage characteristics. Thus it is
possible that the T-33B battery may have only 10 .)1' 15 minutes of life remaining,
and ther'3 would be no way to charge the unit in the aircraft and continue the test if
the battery rlUlS down. Result - wasted time.
T-33
2 - 6
SECTION 3
THEORY OF OPERATION
3.1
SYSTEM:
The T-33B consists of several printed circuit board assemblied which are broken down
according to function. The transmitter receiver section forms one printed circuit
board utilizing one integrated circuit as the I. F. amplifier. A separate R. F. board
contains the attenuator circuitry required to make receiver sensitivity measurements.
The encoder, decoder, and translator are each a separate printed circuit board. The
Numitron driver circuit board and battery charger circuit board complete the unit.
Figure 3 - 1 is a block diagram of the unit. Refer to section 3.2 for detailed descriptions of the circuitry.
Figure 3 - 2 is a timing diagram with the T-33B set to Mode 3/A which will help in
lmderstanding what is happening during each interrogation period of the T-33B. Waveshape number one is the reference waveshape. A scope synchronized with this pulse
can then be used to display all others.
3.2
FUNCTIONAL DESCRIPTION:
3.2.1
Q2, Crystal Oscillator
Q1 operates as a common base Colpitts oscillator with feedback taking place
at the series resonant frequency of the crystal. The collector tank circuit is
timed to the fifth overtone of the crystal, 128.75 MHz, and prevents oscillation
at the fundamental and third overtone crystal frequencies.
3.2.2
Q1, First R. F. Frequency Doubler
Q2 operates as a grolll1ded base frequency doubler. The collector of Q2 is returned to B + through modulator Q4, so that Q2 operates only in the presence
of pulses at the base of Q4. The output frequency of this stage is 257.5 MHz.
3.2.3
~3,
Second R. F. Frequency Doubler
Q3 is a common emitter frequency doubler. Since it has no forward bias there
is conduction only in the presence of R. F. energy from Q2. The collector circuit is tuned to 515 MHz.
3.2.4
Q29, Third R. F. Frequency Doubler
R. F. energy at 515 MHz is coupled to the base of Q29 through C46. The output circuit of Q29, L7 and C4, is a parallel resonant circuit tuned to 1030 MHz.
A 50 ohm transmission line carries R. F. energy from the tank circuit to the
antenna of the unit. The output from this stage is also fed to Q 5 as a local
oscillator signal, and the R. F. attenuator printed circuit board.
T-33
a-
1
VARIABLE
ATTENUATOR,
'/
XTAL
OSC
---to
DOUBLER
rl> DOUBLER
J
14-
MODULATOR
ADDER
f-+
DOUBLER
..
-
ENCODER
GATE
~
N
I MHz
CLOCK OSC
•
.
w
~
DECODER
GATE
~
~
-+
MIXER
P3
rOt
Fyy???
28 BIT ENCODING
SHIFT REGISTER
~
68S.655 KHz
rCLOCK OSC
VIDEO
LATCH
~
VIDEO
AMP
---to
...
METER
AMP
~
j
y
60 MHz
IF AMP
J
PIP2
PRF
GEN
l+
" " "" "
20 BIT DECODING
SHIFT REGISTER
REPLY
LATCH
I
G
r
DRIVERS
I
BINARY
DIGITAL
•
-I
BINARY
;0
l"
z
(I)
DIGITAL
NUMITRON
NUMITRON
r
~
0
;0
--"
BINARY
DIGITAL
FIG
3-1
....
BINARY
DIGITAL
-
'--
NUMITRON
NUMITRON
I.
1\=-_--,--____________
_
o
5,us
PRF Gen Sig DifferEmtiated
2.n~-------------o 4)Js Encoder and Decoder Shift Reg Preset Pulse A
~,u~s~----------__---------------------------------
3.0
Encoder and Decoder Shift Reg Preset Pulse B
·u
4
58~P~s~---------------------------------------------­
Encoder Clock Osc. Gate Start Pulse
5r-____________~~,.5ps
5.J
, - - I_
_
_
_
_
_
_
_
_
__
Encoder Clock Osc. Gate Pulse
15,(1&
6.
Encoder Clock Pulses
7.~
I~SL-----------------------------
8.
14.5P;:,:s=--_______________________________
Encoder Output Pulses
U
Encoder Clock Osc. Gate Stop Pulse
FIG 3-2
8/72
3 - 3
15jJs
9.
U
Decoder Clock Osc. Gate Start Puis e
15
43jJs
I
10.
I
Decoder Clock Osc. Gate Pulse
II
5
7
_ _ _--'13
'Lf1J-
15
4·"'3jJc:::S"---_
UlL--_ _ _ _----...lI-
Combined Encoder Pulses and Decoder Gate Pulse
•
12,_ _~_ _ _ _ _ _-,j
43jJs
I~,--_ _ _------~
16,!.ls
Video Pulses
14·______~__________~
16jJs
Stretched Video Pulses
__ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _~43ps
15
,
Decoder Clock o,sc. Gate Stop Pulse
FIG
U
3-2
3 - 4
3/73
Q4, Modulator
Q4 is an emitter-follower which provides collector current for Q2 whenever
pulses are applied to Q4 base. A test switch in the base circuit of Q4 allows
the R. F. section of the lmit to operate in a cw mode, which is necessary for
. alignment of the tuned circuits.
3.2.6
Q5, Mixer
Q5 operates as a frequency mixer. Its base receives the crystal controlled
1030 MHz produced by Q29 and the 1090 MHz reply pulses from the transponder. Mixing of these frequencies produces a 60 MHz I. F. in the output
of this stage. The 1030 MHz local oscillator signal is delayed 3 Iffiec from P3.
It is turned on by the decoding shift register gate and remains on while the
gate is open.
3.2.7
IC1, I. F. Amplifier
The 60 MHz output of Q5 is amplified by this Ie. Since the transponder may
be several MHz off frequency, the output circuit of the IC is tuned by voltage
controlled diodes and has a tuning range of 54 to 66 MHz. This is controlled
by the 1090 MHz potentiometer on the front panel. The gain of this IC is controlled by the RECEIVER SENSITIVITY control on the front panel when the
SLS/REPLY switch is in the Level position. IC1 operates only during the gate
time of the decoder clock so that the interrogation pulses of the T-43 do not
come through the receiver Video section.
Q22 and Q28 provide compensation to diodes CR2 and CR3 so that the frequency
calibration of the I. F. amplifier remains essentially constant with changes in
the sensitivity control on the front panel.
3.2.8
Q6, Emitter-Follower
Q6 acts as emitter-follower to drive Q7 with detected I. F. pulses.
3.2.9
Q7, Pulse Amplifier
Q7 amplifies and inverts the detected reply pulses.
3.2.10
Q8 and Q9, Emitter - Followers
Q8 and Q9 are cascaded emitter-followers. C26, connected from the emitter
of Q9 to ground, acts as a pulse stretcher to provide sufficient energy to
activate the microammeter, Ml.
3.2.11
Q10, PRF Generator
Q10 together with R30 and C27 form a relaxation oscillator whose frequency is
3 - 5
determined by the time constant R30, C27. When power is applied to the
circuit Q10 is biased in the conducting region and C27 charges to the supply
vpltage very rapidly. This cuts off Q10, and C27 then discharges through
R30 until the point is reached where QlO conducts and charges C27 again •
. The signal produced is a saw tooth with a sharp rise and a decaying fall.
The sharp rise time is differentiated and fed into two inverter clippers IC2D
and lC2F.
3.2.12
IC2D and lC2C, Inverter Drivers for Gate IC3A
The two inverters IC2D and lC2C shape and delay the differentiated saw
from the PRF Generator to generate a drive pulse for the gate lC3A
terminal 1.
3.2.13
lC2F, lC2E, IC2A and lC2B, Inverter Preset Pulse ShapeI'
The four inverters IC2F, lC2E, lC2A and IC2B shape the differentiated saw
from the PRF Generator to generate preset pulses for the 28 Bit Encading
Shift Register IC4 thraugh lClO and the Decoding Shift Register IC15 thraugh
lC19.
3.2.14
lC3A and IC3B, Clock Oscillatar Gate
The clock .oscillator gate is compased of twa NAND gates IC3A and IC3B connected to form a latch circuit. The circuit has two stable states. When IC3A
(terminal 1) receives a pulse from IC2C (terminal 6) the .output IC3A (terminal
3) goes ta logical one and remains there until a stop pulse is received at lC3B
(terminal 5). When a stop pulse reaches lC3B (terminal 5) it resets lC3A
(terminal 3) output to lagical zero. This action turns the 1 MHz clock oscillator
on and off by changing the bias on the base of the emitter-follower QIL
3.2.15
Q12, 1 MHz Clock Oscillator
Q12 is a Colpitts oscillator which operates at a frequency of 1 MHz. Callector
.voltage for Q12 is fed through emitter-fallower Qll so that oscillation takes
place only during the time the gate output of IC3A (terminal 3) is at logical
one. The output of Q12 is fed ta emitter-follower Q13 which drives an inverter
pulse shapeI' IC12C to produce clock pulses which are fed ta terminal 7 of the
encoding shift register lC4 through IC9.
3.2.16
IC4 through IC10, 28 Bit Encoding Shift Register
The encoding shift register consists of twenty eight flip-flop circuits connected
in cascade with provision to preset each of the flip-flops to logical one or logical
zero output. The PRF rate generator initiates the pulse which presets the first
output to logical zera and all other outputs to logical one. The PRF rate generator
also initiates the pulse, which is delayed from the preset pulse, to open the gate
3 - 6
and start the 1 MHz clock oscillator. The clock pulses then transfer logical
zero through the entire shift register at a 1 MHz rate.
By taldng
pulse outputs at specific points in the shift register it is possible to have
pulses occuring at specific delay times. In this way timing for PI, P2, and
P3 of the interrogation for all the modes, is produced.
3.2.17
I.CllA, ICllB, ICnC, Adders
The outputs of the encoding shift register are added in a NA ND gate ICllA
to produce a three-pulse train consisting of PI, P2, and P3. These pulses
are 1 microsecond wide. They are fed to NAND gate ICllB and inverted.
The resultant output of this gate is the three pulse train with 1. 0 microsecond
pulse width. This train is fed to NAND gate ICllC along with a strobe pulse
from IC3B (terminal 6). The purpose of the strobe pulse is to provide a
local oscillator for the received reply pulses from the transponder. The combined pulse train is fed to an inverter IC12A and then an amplifier Q14. The
output of Q14 drives the modulator Q4 in the R. F. section.
3.2.1B
IC3C and D and IC12D, Steip Gate Pulse Delay
·'1
Two NAND gates IC3Ga:nd D are connected in a latch configuration. The
selected P3 pulse is fed 'to one gate and the clock pulses to the other. The
output of this combination is 0.5 microsecond wide and delayed by approximately 0.5 microsecond from P3. This pulse is differentiated and drives the
inverter pulse shapeI' IC12D. The output from the inverter is delayed approximately 1 microsecond from P3 and acts as the gate stop pulse for IC3B to turn
off the clock oscillator.
3.2.19
IC14F, Inverter Shaper
The gate stop pulse from IC12D is differentiated and fed to IC14F. an inverter
and pulse shapeI'. The output is used as a start pulse for the decoder gate.
3.2.20
IC13A and ICI3B, Decoder Gate
The decoder gate, IC13A and IC13B is composed of two NAND gates connected
together to form a latch· circuit. This gate turns the decoder clock oscillator
on and off. When it receives a start pulse from terminal 12 of ICI4F, approximately 1.5 microseconds after P3, it starts the decoder clock oscillator. When
it receives a stop pulse from terminal 10 of IC14E it stops the clock oscillator.
3.2.21
Q17, 689.655 kHz Cloc1, Oscillator
Q17 is a Colpitts oscillator operating at 689.655 kHz (period 1.45 microseconds).
Collector voltage for Q17 is fed through emitter-follower Q16 so that oscillation
takes place only during the time the decoder gate output of IC13A (terminal 3)
is a logical one. The output of Q17 is fed to emitter-follower Q1B which drives
an inverter pulse shaper, IC14B. IC14B drives inverter IC14C to produce
clock pulses which, are fed to terminal 7 of the decoding shift register IC15
through ICI9.
3 - 7
3.2.22
IC13C and ICI3D, Video Latch
In .order for the decoder to record the video information, video information
and a clock pulse must occur at the same time, the video pulse occurs at an
indeterminate time with relation to the clock pulse. Therefore the video
pulse must be held at the serial input of the shift register until a clock pulse
occurs. This function is accomplished by the video latch. The circuit consits
of two NAND gates (ICI3D and ICI3C), connected together to form a circuit
which has two stable states. A logical zero video pulse fed into terminal 12
of IC13D will caus e its outputs terminal 11, to become logical one and remain
at logical one until a clock pulse (logical zero) occurs at terminal 10 of ICI3C.
This clock pulse resets the latch output to its original state of logical zero. In
this mailler the video information is held at terminal 1 of IC15 (shift register)
until a clock pulse occurs.
3.2.23
SLS Modulator IC22A, IC22B, and Q32
Two Negative going pulses from the encoding shift register are combined
in IC22A to produce a single positive pulse 2 microseconds wide occuring
during the time of P2. IC22B is used as a gate to allow this wide pulse
through to the base of Q32 when the REPLY /SLS switch calls for SLS to be
9 dB down. Q32 acts as an emitter follower and applies B + and SLS modulation to Q3 and Q29 through L6 and L7. A potentiometer in the base circuit
of Q32 allows the SLS modulation to be set to 9 dB below PI and P3.
3.2.24
Percent Reply Comparator IC22C, IC22D, and Q33
IC22C and IC22D are connected in a latch circuit configuration. This circuit
has two stable states. At the start of the interrogation a negative going PI
pulse causes the output of IC22D to go to a logic one condition. If a transponder
reply is received the output of IC22D is switched to a logic zero condition by the
action of IC22C. Thus the output of IC22D is essentially zero during the interval between interrogations when the T-33B receives 100% transponder replies.
1922D turns on constant current generator Q33 and causes the meter to read
100%. Should the transponder reply at a rate less than 100% the output of
IC22D remains at logic one condition each time the interrogation is not followed
by a reply, and the percent reply is the average current generated by Q33. Full
scale of 10%, required when the SLS pulse is on, is provided by increasing the
current of Q33 by a factor of ten. This is accomplished by changing the resistance in the emitter circuit of Q33.
3.2.25
Attenuator Current Generator Q34
Q34 is connected as a current generator with a variable resistance in the
emitter circuit.
3- 8
@l
When the REPLyjSLS switch·is in the 100% or 10% position current flows
from the collector of Q34 through a diode CR35 and resistor R211 to the
variable attenuator. The amount of current fed to the attenuator, and thus
its attenuation, is controlled by the front panel RECEIVER SENSITIVITY
control.
When the REPLyjSLS switch is set to the Level position current is allowed
to pass through R203, CR37, R211, and the attenuator. This cuts off CR35
and at the same time maintains jIlinimum attenuation. Current from Q34
then flows through CR36 and R2!0. This allows the front panel RECEIVER
SENSITIVITY control to vary the voltage fed to ICI in the T-33 receiver,
and control its sensitivity.
3.2.26
Receiver Blanking Q35
A positive going pulse, occuring during the reply time of the transponder,
is fed to the base of Q35. This cuts off Q35 and allows the RECEIVER
SENSITIVITY control to set the gain of I. F. amplifier ICI. At all other
times a Q35 is held in saturation causing a + 5 volt level to be applied to ICl,
cutting it off. In this way the receiver is cut off at all times except during
the reply time of the transponder.
3.2.27
Attenuator
The attenuator is actually composed of five separate attenuators: three
fixed and two variable. The fixed attenuators are L or 11 sections which
serve to isolate the variable attenuators while providing the required
fixed attenuation. The variable attenuators are hot carrier diodes with
variable resistance characteristics. The amount of resistance, and thus
attenuation, is controlled by the level of current in each diode. CR3B and
R2l5 is the variable attenuator which provides the transponder receiver
sensitivity measurement. CR39 and RIS0 is an attenuator used for calibrating the front panel RECEIVER SENSITIVITY dial.
3.2.2B
IC15 Through lC19, 20 Bit Decoding Shift Register
The purpose of the decoding shift register is to collect the video information
and present it to the translator in proper sequence and at the proper time
for readout. Preset pulses from the input and output of ICI4A are initiated
by the PRF generator QI0. These pulses, and the fixed bias on terminal 14*
of ICI5, presets terminal 13 of IC15 to logical one and all other outputs of
the shift register to logical zero. Approximately 1. 5 microseconds after
P3 a start pulse from IC14F activates the decoder clock oscillator gate ICI3A,
IC13B and starts the decoder clock oscillator. The clock pulses advance the
. logical one preset into terminal 13 of ICI5, through the shift register. Coincident with the second clock pulse the stretched video pulse (first Framing
pulse) is applied to terminal 1 of ICI5. This transfers a logical one to
terminal 13 of IC15 which is then stepped through the shift register by sub-
* terminal
2 on T-33C instead of terminal 14
3 - 9
sequent clock pulses. In this manner each video reply pulse is entered
into the register and stepped along. When the original preset logical one
*arrives at terminal 9 of IC19 it drives inverter IC14E to produce a stop
pulse for: the decoder clock oscillator gate. The clock oscillator stops
and the decoder retains the reply pulse information until it receives
another preset pulse,
* terminal 10 on T-33C instead of terminal 9
3.2.29 IC28B, IC28E, and Q21, Framing Pulse Detector and Display Code Selector
The T-33B is designed so that no readout will be obtained unless both
Framing pulses are preset in the reply train. This avoids the possibility
of reading erroneous reply codes due to a lack of Framing pulses. When
Q21 conducts, supply voltage is fed to the display code selector switch.
Q21 will not conduct unless the output of both IC28B and IC28E are at
logical one. IC28B receives its input signal from pin 1 on Numitron V1
and IC28E receives its input signal from pin 1 on Numitron V3. (These
are the Numitron connections for displaying Framing pulse readouts.)
The READOUT selector switch applies the supply voltage to the proper
integrated circuits to provide the desired display. In addition it disconnects power to the translator circuitry when altitude readout is not required. This feature conserves battery power,
3.2.30 IC31B, IC31A, IC31C, IC31D, IC30D, IC30C andIC30B Gray to Binary
Code Converter
Seven exclusive OR gates are used to convert the A, B, and D reply
pulse information to 500, 1K, 2K, 4K, 8K, 16K, 32K, and 64K feet,
using -1200 feet as a zero reference. This reference is necessary because the ICAO code start at -1200 feet using a mixed Gray binary and
Gray decimal code. (A Gray code is one in which only one bit at a time
changes. Thus, a 3 bit Gray code would be ODD, 001, 011, 010, 110, 111,
101, 100.)
The C reply pulse information contains the 100 foot increments of the
altitude. To utilize this information the C pulse sequence must be converted in several steps, A s encoded by the digitizer, this sequence is
1, 3, 2, 6, 4, 4, 6, 2, 3, 1. The first conversion is to sequence 1, 3, 2,
6, 4, 1, 3, 2, 6, 4 or 4, 6, 2, 3, 1, 4, 6, 2, 3, 1 (depending upon the
logic states of the negative altitude bus and 500 foot bus).
This is accomplished by IC30A, IC35A, IC44A, IC44C, and IC43. The
three bit C information is then passed through IC44B and IC44C which
form a Gray code to binary code converter. This results in the sequence
1, 2, 3,4, 7, 1, 2, 3, 4, 7 or 7,4, 3, 2, 1, 7, 4, 3, 2, 1. IC34D and
3 - 10
IC45 add 2 to each number of the sequence except 7, so that the sequence
becomes 3, 4, 5, 6, 7, 3, 4, 5, 6, 7 or 7, 6, 5,4, 3, 7, 6, 5, 4, 3. In
addition, a logic one level from the 500 foot bus, through IC45, adds 5 to
the second half of each sequence. Thus we have 3,. 4, 5, 6, 7, 8, 9, 10,
11,12, or 12, 11, 10, 9, S, 7, 6, 5,4,3, This information is passed
through IC46, a binary to BCD converter, and then fed to the "D"
Numitron to read hundreds of feet,
3,2,31
C and D Error Check
A binary to decimal decoder, IC43, is used to provide an output of logical
one in the event of an invalid C Code (0, 5, or 7), This error signal is
then used to add 400, 000 feet to the altitude display so that the technician
is alerted that the transponder has an invalid reply. The ICAD Code does
not have any odd value for D, thus the D1 pulse must always be zero. The
D1 output of the decoder is used to add 200, 000 feet to the altitude display so
that the technician is alerted that the transponder has an invalid reply. An
error in both C and D Codes will add 600, 000 feet to the altitude display.
3,2,32
Negative Altitude Determination
A total of nine gates are used to analyze the output of the Gray to Binary
converter to determine if the transmitted reply represents a negative altitude, This is accomplished by first determing if the magnitude of the
altitude is below 2, 000 feet, Then, by analyzing the C4 pulse, 500 feet,
and 1, 000 feet components of the reply the negative altitude is determined.
The output of IC35B is logical one for a negative altitude, causing the
center segment of the "A" Numitron (VI) to be lit and show a minus sign.
3,2.33
-1200 Feet Correction
The ICAD Code starts at -1200 feet, Therefore, in order for the T-33B to
display the correct altitude, this factor of -1200 must be added to the outputs of the Gray to Binary converter, This is accomplished by two 4 bit
adders IC37 and IC3S,
3.2.34
7 Bit Binary to BCD Converter
The 7 bit Binary to BCD conversion is accomplished by IC39, IC40 and IC41,
These are 6 bit Binary to BCD converters ponnected in cascade to perform
7 bit Binary to BCD conversion. The function performed by these 6 bit
Binary to BCD converters is analogous to the alg6rithm.
a.
b,
Examine the three most significant bits, If the Sunl is greater than
four, add three and shift left one bit,
. Examine each BCD decade, If the sum is greater than four, add three
and shift left one bit,
3 - 11
c.
Repeat step (b) until the least significant binary bit is in the
least significant B CD location.
The output of the 7 bit converter is fed to the A, B, and C Numitrons to
display the 100,000, 10,000 and 1,000 foot components of the decoded
altitude.
The output of the 7 bit converter is fed to the A, B, and C Numitrons to
display the 100,000, 10,000 and 1,000 foot components of the decoded
altitude.
3.2.35
Numitron Readouts
Four identical Numitron readout circuits are used to display the reply readout. Thus the following description of the "A" Numitron, VI, applies also
to V2, V3, and V4.
AI, A2, and A4 binary information stored in the decoding shift register is
fed to the translator printed circuit board and ultimately appears at the input of the "A" Numitron decoder, IC22. This decoder translates the binary
code information to the proper outputs to light up the segments of the Numitron
and display the proper digit. When the T-33B READOUT switch is set to the
PILOT or BINARY position the translator circuitry is disabled by removing
the regulated 5 volt power to IC30 through IC46, except IC36 and IC42. The
AI, A2, and A4 information is passed through buffers IC42D, 42F, and 42E
to decoder IC22 and binary display inverters I026F, 26A, and 26B. When
pilot code is desired, 1022 is energized; when binary code is desired IC26
is energized. When the READOUT switch is in the ALTITUDE position the
Binary to BCD decoders in the translator and the Numitron decoder IC22 are
turned on; buffers IC42 and inverters 1026 are turned off.
DC power to the Numitron decoder IC22 and Binary display inverter IC26 is
controlled by IC28B and IC28E through 5 volt regulatorQ21, so that the display is blanked out if either or both Framing pulses are absent. IC28A, 28D,
28F, and 28C connect power to the Numitrons to indicate Framing, X, and
Ident pulses.
3.2.36
Power Supply and Battery Charger
The T-33B utilizes seven 1. 2 volt Ni-Oad cells as its' power source. Most
of the power in the unit, at 5 volts, is required by the integrated circuits and
Numitrons. This is provided by IC21 and Q20. A small portion of the power,
at 9 volts, is required by the R. F. section of the unit. In order to operate
IC20 as a 9 volt regulator the 8.4 volt terminal voltage of the batteJ;'y is doubled .
• This is accomplished by generating an 8 volt peak-to-peak square wave and
passing it through a voltage doubler, similar to that used on AC supplies. The
output of the doubler, about 14 volts under load, is then fed to IC20.
3 - 12
The charger circuit performs two functions: It supplies a constant
current of about 400 ma to the batteries at all times, and delivers full
load current to the unit when the unit is in operation. In this way the
unit may be operated continuously from the AC line, without drawing
any current from the batteries.
The unit is protected by two fuses, a 1/2 ampere "SLO BLO" fuse connected in series with the AC line and a 3 ampere fuse connected in
series with the batteries.
3.2.37
IC21, and Q20, Voltage Regulator for 5 Volt Supply
IC21, Q20 and their associated components form a 5V regulated supply.
The load on this supply varies over a wide range since it furnishes current
for the Numitrons as well as other circuitry. Depending upon the particular
readout, current required by the Numitrons varies over the range of 50 ma
to 700 mao IC21, is a fixed 5 volt IC regulator circuit which is returned to
ground through CRll so that a fixed voltage of 5.7 volts is impressed on the
base of Q20. The emitter of Q20 is thus held to 5.0 volts over the wide range
of load current.
3.2.38
IC20, Voltage Regulator for 9 Volt Supply
IC20 and its associated components act as a 9V output regulator. As long as
the input voltage to the regulator is 12.5 volts or greater tne output will be a
regulated 9 volts. Q19 monitors the + 14V bus and the 9V output. If the bus
voltage drops to a level where the regulator can no longer produce 9 volts, the
meter in the collector circuit of Q19 will indicate in the red portion of its
scale. A red scale reading of this meter indicates that the batteries require
recharging.
3.2.39
Video Emitter Follower, Q36
Interrogation video pulses from IC11 pin 12, and reply video pulses from
Q-8 emitter, are fed to Q36 which is an emitter follower. The output of Q8
is fed to the front panel video test point to provide a means for displaying
both interrogation and reply pulses.
3.2.40
Directional Coupler Assembly
The directional coupler assembly is a separate printed circuit board mounted
near the final R. F. amplifier of the transmitter. The purpose of the directional coupler is to attenuate the R. F. energy fed to the variable attenuator from
the transmitter, while permitting the received signal from the transponder to
reach the receiver with minimum attenuation. The use of a directional coupler
for this purpbse permits a high level of transmitter power in the T-33B without sacrificing the sensitivity of its receiver.
T-33
3 - 13
3 - 14 Blank
SECTION 4
TROUBLE SHOOTING AND MAINTENANCE
4.1
GENERAL:
The T-33B is completely solid state, with a large portion of the circuitry composed
of TTL integrated circuits. Periodic maintenance requires recharging the Ni-Cad
battery for at least 14 hours once a month. A1l1lual recalibration is recommended.
The battery check indicator on the front panel of the instrument shows the condition
of the battery when the instrument is turned on. If the needle on this indicator enters the red area of the scale the battery is exhausted and must be recharged.
The T-33B is protected by two fuses, both located on the battery charger printed
circuit board. A 1/2 ampere "SLO BLO" fuse, type lVlDL-1/2, is located in the
transformer primary lead and a type AGC-3, three ampere, fuse is c01l11ected in
series with Ni-Cad batteries. To determine if the fuses are good plug the line
cord into a 115V 50-400 Hz outlet. If the charge indicator lamp lights, the fuses
are good.
Do not fuse the unit with a larger value fuse since charged Ni-Cad cells can deliver
over fifty amperes into a short circuit. This could result in serious damage to the
wiring and printed circuit boards. Both board conductors and wiring can melt.
In the event a transponder does not check out with the T-33B, try the unit on another
• transponder, Imown to be in operating condition.
The T-33B utilizes several printed circuit boards in its construction. Most printed
circuit boards are readily accessible by means of hinged assemblies. Most integrated
circuits and transistors may be removed from the unit without unsoldering. Before
attempting formal trouble shooting procedures it is recommended that the transistors
or integrated circuits in the section showing trouble be checked. Tbe quickest check
is to replace the suspected transistor or integrated circuit with a new one.
4.2
DISASSEMBLY:
To remove the T-33B from its cabinet remove the antenna cap and the four binding head
screws from the front panel. Swing the bottom of the front panel out while holding the
top of the panel in place. This will permit the R. F. cOlmectors in the top of the unit to
clear the cabinet. The entire chassis will then lift out of the cabinet. Be careful to
avoid putting a strain on the battery supply leads. The battery supply leads are terminated in a connector which plugs into a socket on the battery charger printed circuit
board.
nO)
T -0L1
4 - 1
To gain access to the entire \Lllit loosen two screws and remove two nuts. The
assemblies will then swing apart to allow access to both sides of all printed circuits
boards in the unit except the decoder and attenuator.
The attenuator printed circuit board is mounted over the decoder board. Remove two
screws on the attenuator board and swing it aside to gain access to the decoder board.
4.3
MAINTENANCE ADJUSTMENTS:
Thls section covers all adjustments in the unit. Do not perform an adjustments unless the unit does not meet its performance specifications, and then only Ii proper
equipment is available. The test equipment required is as follows:
A.
Oscilloscope, two channel, triggered mode, bandwidth at least 10 MHz.
( H. P. Model 180A or equivalent.)
B.
VTVM (RCA <TUllior Volt Ohmyst or equivalent.)
C.
Spectrum Analyzer.
D.
Signal Gene:cator for 1030/1090 MHz.
K.
R.F. Detector for 102,0 MHz.
F.
DC Power Su~ply variable to 10V at 1.5 Amp.
equivaIent. )
G.
Counter (E. p. Model 5245L with 5254C Frequency Converter or equivalent.)
H.
TIC Model T-l4A ATC Pulse Generator.
I.
Digital Voltemeter, Fluke 8000A or equivalent.
J.
Adapters, GR874 to BNC and TNC.
(H. P. Spectrum Analyzer 8554L/8552A or equivalent.)
(H.P. Mod.e: 612A or equivalent.)
(Modified General Radio 874 VQ or equivalent.)
(HeathkIt NCodel IP20 or
Refer to Elustrations for locations of the following adjustments:
4.3.1
R60, + 9 Volt Adjust
This potentiometer controls the output of IC20, the 9 volt regulator. Connect a Fluke or Digital Voltmeter between chassis and TP + 9V, on the encoder board. Adjust RGO on the encoder board for a reading of + 9 volts
± .1V.
4.3.2
R,G2, Battery Condition Indicator
.
This potentiometer sets the point at which the BATTERY CHECK meter
needle enters the red portion of the scale. Connect a adjustable 10 volt,
1. 5 ampere DC supply between chassis (negative lead) and the collector of
'1.'-33
4 _
9
:)1' Q21 power transistors.
Do not operate t.'lU jJ0W<:1' SWitC!1. Connect
a VTVM to TP + 9V on the encoder board. Reduce the output voltage of
the supply and determine the input voltage at which the voltage a.t TP + 9V
falls out of regulation. set the power supply to 0.25 volt higher. Adjust
R62 so that the battery check indicator is exactly on the dividing line betw,een the red and white portion of the scale.
Q2C
4.3. 3.
Transmitter Alignment
This section covers four tuned circuit adjustments on the R. F. board.
These adjustments must be performed in sequence. An R. F. detector
capable of detecting 1030 MHz pulses will be required to perform the R. F.
alignment of the unit. A modified General Radio 874 VQ detector is recommended. To modify this detector, use the following procedure, which reduces the output capacitance of the detector.
~.
Unscrew the detector output connector assembly from the body of the 874-VQ.
b.
Remove the two screws holding the capacitor plate. Lift t1:1e capacitC'r
plate and remove the mica sheet.
c.
Remount the capacitor plate with a two 1/4" diameter insulating wash.ors
which are 0.016" thick and have a 0.125" hole. The was!:!ers may be
made of any good insulating material. Do not use washers of greater
thiclmess, since contact with diode will be lost.
d.
If desired, the IN23 diode may be replaced with IN23Br diod" to provide a positive pulse output.
e.
3.eplace the detector output connector assembly to the body of the 874-VQ.
Transmitter Adjw,tmento
a.
C1, R. F. Oscillator
set the test switch on the R. F. board to the cw position. Connect th2 common
lead from the VTVM to TP3 and the other iead to TP1. Set the VTVH to
read negative voltage. Adjust C1 for a maximLUTI ])8 reading. WARNlNG:
The power supply or the VTVM must be floating above grolU\d or the 9V
supply will be shorted out. Normal indication is about -2 volts.
b.
C2, C3, and C4
These adjustments tune the tank circuits of Q3 and Q29, and are performed under pulse modulation conditions. To make these adjustments
a detector capable of detecting R. F. pulses at 1030 MHz will be required. A modified General Radio 874 VQ detector, connected as shown
in Figure 4 - 1 is recommended.
4-3
33B
Set the T-33B test switch on the R. F. board to Normal. Set the vertical
gain of the scope to 0.1 volt per centimeter, and synchronize the scope
internally. Adjust C2 for maximum pulse height. If no pulse display is
present, set C3 and C4 to midposition and readjust C2 for maximum
pulse amplitude. Once C2 is adjusted, retune C3 and C4 alternately
until maximum pulse amplitude is obtained. The final pulse amplitude
should equal or exceed + 5 dBm. You may calibrate the detector at
+ 5 dBm by connecting it to a HP612A set to + 5 dBm output, CW function
at 1030 MHz and observing the DC level displayed by the scope. This
hookup is shown in Figure 4 - 2.
T-33 ANT
GR874VQ
CRO
0
50-'1.
Y
•
I
1
lK
FIG. 4-1
R. F. out
CRO
GR874VQ
HP612
O--!------l
50-'1.
10
I
Y
lK
FIG. 4 - 2
4 - 4
I
4.3.4
Receiver Adjustments
This section covers adjustment of C13 mixer input, LB mixer tame, and
T1 I. F. transformer. For this adjustment a signal generator capable
of delivering an accurate 1090 MHz CW signal will be required. Use a
frequency counter to set the frequency. Note: The accuracy of the
1090 MHz dial on the T-33B will be determined by the accuracy of the
1090 MHz frequency.
"
,Set the REPLY/SLS switch to Level. Connect the output of the signal
generator to the TNC connector of the T-33B with a 50 ohm cable. Set
the 1090 MHz control on the T-33B front panel to zero and adjust the
output of the signal generator for the lowest level which results in a
reading of the front panel meter. Adjust C13, LB, and T1 for maximum
meter deflection.
4.3.5
R1B, Receiver Threshold
Set the REPLY/SLS switch to the Level position. Turn the RECEIVER
SENSITIVITY control on the T-33B to the maximum CW pOSition. Adjust
R1S so that the front panel meter just reads zero.
• 4.3. 6
L10, 1 MHz Clock Oscillator
LID is correctly set when P1 to P3 spacing in Mode D is 25.0 ± 0.1
microseconds. To make this adjustment the modulating pulse train
at TP4 may be compared to the 1 microsecond crystal controlled
markers of a T-I4A.
Connect the Y input of one channel of the scope to TP4 on the R. F. board.
Connect the marker output of a T-I4A to the other Y channel of the scope.
Set the T-l4A marker control to 1.0 microsecond and adjust the scope for
alternate sweep, positive internal sync so that both waveforms are displayed.
Se't the T-33B to Mode D and the scope to 5 microseconds for centimeter
sweep speed. Magnify the sweep ten times and adjust L10 so that the leading edge of P1 and P3 are 25.0 ± 0.1 microseconds apart.
Calibration of Mode D automatically calibrate all modes of the T-33B.
Check all modes for proper spacing within ± 0.1 microsecond. Spacinge
are as follows: Mode 1, 3 microseconds; Mode 2, 5 microseconds; Mode A,
B microseconds; Mode B, 17 microseconds; Mode C, 21 microseconds; and
Mode D, 25 microseconds.
.•
'
4-5
4 3.7
0
Lll, 689.655 kHz Clock Oscillator
Lll is correctly set when the operating frequency of this clock oscillator
.is 689.655 kHz. To make this adjustment it will be necessary to compare
the gated clock oscillator output against the 1.45 microsecond crystal
controlled markers of a T-14 A.
Connect the Y input of one channel of the scope to TP14 on the decoder
board. Connect the marker output of a Tl4A to the other Y channal of the
scope. Set the T-l4A marker control to 1.45 microsecond and adjust the
scope for alt9rnats sweep, positive internal sync so that both waveforms
are displayed.
Adjust Lll on the decoder board so that the clock pulses and markers
:ine up. Fo:':' best accuracy set the sweep speed of the scope to 5 microseconds per centimeter and use the lOX sweep magnification.
4.3.8
R192, SLS Adjust
The SLS adjust potentiometer controls the level of the SLS pulse with
referer.ce to PI and P3. To make this adjustment refer to paragraph C
of section 4.3.3. Connect the detector to the output of the T-33B and
note the pulse amplitude of PI and P3. Connect the detector to the output of the H. Po 612A and set the signal generator to 1030 MHz at the same
~evel as ihe T-33B. R educe the output of the H. p. 612A 9 dB and note the
new pulse amplitude. This is the -9 dB reference level. Reconnect the
T-33B to the detector and adjust R192 so that P2 is at the -9 dB reference
level.
4.3.9
R200, Reply Rate Calibrate
This potentiometer is adjusted by interrogating a transponder and setting
R200 for a meter reading of 100% with the REPLY/SLS switch in the 100%
pOSition. Be sure there is sufficient signal strength between the T-33B
and transponder so that 100% replies are generated. This can be verified
by synchronizing the scope with the PRF pulse at TP7 and examining the
video waveform at TP5. 100% reply rate will produce no baseline trace
at each reply pulse.
4,3.10
R213, Level Set
This potentiometer calibrates the variable attenuator in the T-33B. It
may be adjusted by comparing the receiver sensitivity measurement of
the T-33B against a measurement made on the same transponder using
pr~perly callbrated bench equipment such as a TIC T-15C. Measure
T-33
4-6
the sensitivity using the T-33B RECEIVER SENSITIVITY control and
adjust R213, if necessary, so that the indicated sensitivity is equal to
the !mown transponder sensitivity.
4.3.11
R205, Attenuator Calibrate
This potentiometer adjusts the range of attenuation of the RECEIVER
SENSITIVITY control. It can be properly adjusted by comparing the
R. F. output of the BNC jack, with the T-33B operating in CW function,
against a calibrated spectrum analyzer or receiver at 1030 MHz. The
output of the BNC jack should vary from -65 to -84 dBm as the RECEIVER
SENSITIVITY control is adjusted over its indicated range. A ccuracy of
this dial should fall within ± 2 dB.
4.4
TROUBLE SHOOTING:
4.4.1
General
When the T-33B is inoperative it is best to isolate the fault to a particular
section by using the procedure outlined in Section 4.4.2. This procedure
will lead the technician in a logical and orderly fashion through the circuitry of the unit until the faulty section is isolated. Once this is done it
is best to check all transistors and integrated circuits in the faulty section
before proceeding further. The best test for a solid state device is to replace it with one known to be good. The use of transistor and Ie sockets
in the unit allows quick substitution. Use an IC puller to remove the Ie's
from tl,eir sockets. Do not unsolder any transistor on the R. F. board unless absolutely necessary, since the tuned circuits will be disturbed.
Refer to the schematic for pertinent voltage and waveshapes, and to the
illustration for location of components. When making waveshape measurements always synchronize the scope externally with the positive PRF
trigger at TP7.
".4.2
Trouble Shooting
Procedt~re
The T-33B is composed of seven. major sections: Transmitter, receiver,
attenuator, encoder, decoder, translator and readout. In order to simplify
trouble shooting first determine if the T-33B initiates reply pulses from a
lmown good transponder. If it does, the transmitter and encoder of the T-33B
are operating, and the fault lies in the receiver, decoder, translator or
readout.
Start the trouble shooting procedure with step 11. If the transponder does
. not reply at 'all , the fault lies in the transmitter or encoder. For this condition start the trouble shooting procedure with step 1.
4 - 7
If the T-33B operates correctly with the READOUT switch in the PILOT
and BINARY positions, but the altitude decoding is incorrect, the fault
lies in the trjinslator board. Follow the trouble shooting procedure for
this board in Section 4.4.3.
PROCEDURE
NORMAL
INDICATION
IF CONDITION
UNSA TIS FA CTORY
10
Measure regulated
+ 9 volts at TP3.
+ 9 ± O. 1 volts. If
normal proceed to
step 2.
Check battery voltage.
Check IC20. Reset+9V
adj. pot. Check for
shorts on + 9 volt !ine.
Check Q23, 24, 25, 26,27.
2.
Measure regulated
+ 5 volts at TP+ 5 v.
+ 5 ± O. 2 volts. If
normal proceed to
step 3.
Check IC2l and Q20.
check for shorts on
+ 5 volt line •
Check PRF trigger at
TP7.
+ 4 volt pulse, 2 /J. sec
wide. If normal proceed to step 4.
Check Q10
Using PRF trigger
( TP7) as positive
eJ>.'"i;ernal scope sync
check 1 MHz clock
gate at TP10. Use
PRF trigger at TP7
for subsequent scope
measurements.
+ 4 volt pulse 5 to 27
/J. sec wide depending
upon mode switch. If
normal proceed to
step 8.
If a logical zero, Che(lk
IC2D, 2C, 3A, and 3B.
If at logical one, check
IC2A, 3B. Proc8ed to
step 5.
Check preset one and
preset two pulses at
pin 6 and pin 8 of IC4
through IC10.
Preset one, + 4 volt
pulse 4 /J. sec wide.
Preset two, -4 volt
pulse 4 /J. sec wide.
If normal proceed to
step 6.
Check IC2F, 2E, 2A,
and 2B.
•
3.
4 - 8
6.
Check 1 MHz clock
5 volts P-P, 1 MHz
oscillator by removing
clock pulse at TP9,
rc3 from its socket and
(Fig. 4-8, 4-11).
connecting a jumper be- If normal proceed to
tween TP10 and the 5
step 7.
volt bus, ('Fig. 4-8, 4-11).
Check Q11, Q12, Q13
and IC12C, (Fig. 4-8,
4-11 ).
7.
Remove jumper and insert IC3 into its socket.
Check lC3B pin 5 for
presence of stop pulse,
(Fig. 4-8, 4-11).
-5 volt pulse 8 to 30
!,sec after PRF trigger
depending upon mode
switch. If normal proceed to step 8.
8.
Check Modulation pulse
train at TP4, (Fig.
4-20 ).
+ 9 volt pulse train con-
Check lC3C, 3D and 12D.
With scope probe, follow
shift of encoder preset
pulse from pin 13 lC4
through pin 10 rC10, *
(Fig. 4-8, 4-11).
* pin 11 lC10 for T-33C
Check te st switch, S 1.
Should be in normal
position. Check rCllA,
llB, 11C, 12A, and Q14,
(Fig. 4-8, 4-11), and Q4
(Fig. 4-20).
9.
sisting of PI, P2, P3
and 28 !,sec strobe pulse.
If normal proceed to
step 9.
Throw test switch on
R. F. board to CWo
Measure voltage drop
between TP1 and TP3,
(Fig. 4-20).
About 2 volts DC. If
normal proceed to
step 10.
Oscillator not operating.
Check Q1 and Q2, (Fig. 4-20).
10.
Measure R. F. output
of TNC JACK with
Spectrum Analyzer.
About + 5 dBm
at 1030 MHz.
Adjust C2, C3 and C4.
Q3 or Q29 inoperative,
(Fig. 4-20).
11.
Check 689. 655 kHz
clock gate at TP15,
(Fig. 4-14).
+ 4 volt pulse 28 !,sec
wide. If normal proceed to step 15.
Check lC14F, 13A and 13B.
Proceed to step 12, (Fig. 4-14).
12.
Check preset one and
preset two at TP2,
(Fig. 4-20) and pin 8
of lC15, (Fig. 4-14).
Preset one, + 4 volt
pulse 4 !,sec wide. Preset two, -4 volt pulse 4
!,sec wide. If normal
proceed to step 13.
Check rCl4A, (Fig. 4-14)
and rC2F, (Fig. 4-8, 4-11).
13.
Check 689.655 kHz clock
oscillator by removing
lC13 from its socket and
connecting a jumper between TP15 and + 5
volts, (Fig. 4-14).
5 volt P-P 689 kHz
clock pulses at TP14,
(Fig. 4-14). If normal
proceed to step 14.
Check Q16, Q1 7, . Q18, 1C14B
and 1C14C, (Fig. 4-14).
14.
Remove jumper and insert lC13 in its socket.
Check lC13B pin 5 for
presence of stop pulse,
(Fig. 4-14).
+ 4 volt pulse about
42 !,sec wide. If
normal proceed to
step 15.
•
4-9
With scope probe, follow
shift of decoder preset pulse
from pin 13 lC15 through
*pin 9 lC19. Check IC14E.
(Fig. 4-14).
* pin 10 lC19 for T-33C
15.
Set up transponder about -1 volt pulses corres20 feet away from T-33. ponding to reply pulse
Operate units so that
train of transponder.
transponder is replying
If normal proceed to
to T-33 interrogation.
step 16.
Check TP6 for presence
of video pulses, (Fig. 4-20)
Set RECEIVER SENSITIVITY
control maximum clockwise. Vary 1090 MBz control over its range. Check
Q5, IC1, (Fig. 4-20).
16.
Check deflection of
front panel microa=eter with REPLY/
SLS switch in LEVEL
POSITION.
Needle should pin full
scale. If normal proceed to step 17.
Check setting of meter
threshold control R18.
Check Q6, Q7, Q8 and Q9.
Check C26 and microammeter, (Fig. 4-20).
17.
Check TP13 of IC13D
for presence of
stretched video pulses,
(Fig. 4-14).
+ 5 volt pulses corresponding to transponder
reply pulse train. If
normal proceed to step
18.
Check Q15, IC13D and
IC13C, (Fig. 4-14).
18.
Set transponder to code
0707. Measure DC
voltage at all output
terminals of decoder
IC15, 16, 17, 18, and
* 19; pins 13, 12, 10
and 9, (Fig. 4-14).
+ 5 volts at FRAMING 1
and 2, B1, D1, B2, D2,
B4, D4 outphts. Less
than 0.5 volts at C1, A1,
C2, A2, C4, A4, X and
IDENT outputs. If normal proceed to step 19.
Replace the IC which
develops incorrect
output voitage.
19.
Set transponder to code
7070. Measure the DC
voltage at all output
terminals of decoder
lC15, 16, 17, 18, and
*19; pins 13, 12, 10 and
9, (Fig. 4-14).
Press IDENT switch
(IDENT only lasts for
approx. 20 seconds.
It may be necessary to
press the IDE NT switch
several times to make
a reading).
+ 5 volts at FRAMING 1
and 2, C1, AI, C2, A2,
C4 and A4 outputs. Less
than O. 5 volts at X, B1,
D1, B2, D2, B4, D4 and
IDENT outputs. If normal proceed to step 20.
+ 5V at pin 13 of IC15.
If normal proceed to
step 21, (Fig. 4-14).
Replace the IC which
develops incorrect
output voltage.
21.
Check + 5 volt driver
bus at emitter of Q21,
(Fig. 4-14).
+ 5 volts. If normal
proceed to step 22.
22.
+ 5 volts. If normal
Check voltage between
proceed to step 23.
pin 2 of each numitron
and chassis, (Fig. 4-25)
20.
* pins
13, 12, 11, and 10 for T-33C
4 - 10
Replace !C15.
Check !C28B, 28E, 25 (Fig.
4-25) and Q21, (Fig. 4-14).
Check + 5 volt connection
from Q20 on ENCODER
BOARD, (Fig. 4-8, 4-11)
to + 5 volt bus on NUMITRON
BOARD, (Fig. 4-25).
23.
If FRAMING 1,
FRAMING 2, or IDENT
display is absent, check
voltage at terminal one
of inoperative numitron.
24.
Set the transponder to
code 0000. If the display is correct proceed to step 26.
Measure the voltage
at terminals 3, 4, 5,
6, 7, 8 and 9 of inoperative numitron
with code switch in
PILOT position.
25.
• Set transponder control head to activate
numeral 7 in inoperative numitron. Throw
READOUT switch on
T-33B to BINARY
position. Measure
terminal voltage at
pins 4, 1, 6 and 7 of
inoperative numitron.
T-33
Less than O. 5 volts
DC. If F1, F2 and
IDENT normal proceed to step 24.
Incorrect voltage,
change IC28. Correct voltage, change
Numitron. If corrective action solves
problem proceed to
step 24.
Less than 0.5 volts
at terminals 3, 4, 5,
7, 8 and 9. + 5 volts
at pin 6. If normal,
replace numitron.
Incorrect voltage at
one or more pins,
replace IC22, 23, 24
or 25.
Less than O. 5 volts.
Numitron should display 3 horizontal bars.
Incorrect voltage,
change IC26 or 27.
Correct voltage
Change numitron.
4 - 11
4.4.4
Attenuator Trouble Shooting
If the T-33B operates normally when radiating a signal from the antenna, but is inoperative when making a direct connection from the
BNC jack, the variable attenuator or its control circuitry may be
defective. It is important to ascertain that the T-33B is defective,
and not the transponder, since the T-33B attenuator signal level
does not exceed -66 dEm. If you are using a transponder with less
than -66 dBm sensitivity the T-33B will not interrogate it. Thus
it would appear that the T-33B is defective when in reality it is not.
Use a transponder with at least -69 dBm sensitivity.
If the attenuator is defective measure the DC current fed to CR38 and
CR39 through C87 and C88. You may do this by disconnecting the leads
at C87 and C88 and inserting a 0 - 10 rna DC milliammeter in series,
or by using a clamp on milliammeter. Current through CR38 should
vary from about zero to 2 milliamperes as the RECEIVER SENSITIVITY
control is varied. Current through CR39 should be somewhere within
the range of 0.3 and 4 mE. If a defective diode or other component in
the attenuator is suspected, the shield ('vel' these components must be
removed to get at the components. It is recommended that such
servic!ng be referred. to the factoryo
4.4.5
Translator Trouble Shooting
In order to locate a fault on the translator circu!t board it wIn be necessary to dial certain reply codes. This may be accomplished by operating
the transponder on Mode A and using the transponder control head to
simulate various altitude codes. Refer to the AL'l'n'UDE-to-CODE
CONVERSION CHART supplie~ with the unit.
1.
Check Gray to Binary decoder, referenced to -1200 feet, according
to the following truth table, TABLE 4 - 1. (0 = .4 volts or less.
1 = 2.4 volts or more.)
Also check for the correct binary outputs when dialing any altitude
code which results in an incorre-ct display. F or example, if altitude
18,700 feet ( code 3140) is dialed into the control head, the proper
outputs of the Gray to Binary decoder should add up to 18,700 plus
1200 or 19,900 feet. Neglecting 100 foot increments, the logical
one outputs should be 16K, 2K, 1K, and 500 feet.
4 - 12
.
ALTITUDE
"'"
ABSOLUTE
ALTITUDE
DIAL
SETTING
PIN 6
IC30B
PIN 8
IC30C
PIN 11
IC30D
PIN 11
IC31D
PIN 8
IC31C
PIN 3
IC31A
PIN 6
IC31B
PIN 2
IC29A
-1200
0
0040
0
0
0
0
0
0
0
0
-700
500
0410
1
0
0
0
0
0
0
0
-200
1K
0640
0
1
0
0
0
0
0
0
800
2K
0340
0
0
1
0
0
0
0
0
2800
4K
4140
0
0
0
1
0
0
0
0
6800
8K
6040
0
0
0
0
1
0
0
0
14800
16K
·3040
0
0
0
0
0
1
0
0
30800
32K
1044
0
0
0
0
0
0
1
0
62800
64K
0046
0
0
0
0
0
0
0
1
f-'
'"
-TABLE 4 - 1
I
2.
Check Negative Altitude Determ\nation
Dial all negative codes from -100 feet to -1000 feet. These
codes are as follows: 0020, 0030, 0010, 0410, 0430, 0420,
0460, 0440, 0640 and 0660. Check IC35B pin 4 for logical
one. Dial several positive ::.ltitude codes. Check IC35B pin 4
for logical zero. Dial any code which results in an incorrect
display. Check IC3 5B pin 4 for correct Jogic level.
3.
Check Hundreds Decoder according to the following tru.th tabJe,
TABLE 4 - 2.
Also check for the correct binary outputs when dialing any altitude code which results in all incorrect display.
HUNDREDS
TRANSPONDER
DIAL
SETTING
PIN &
IC45
PIN 1
IC46
PIN 2
IC46
r
PIN 3
IC46
100
0630
1
0
0
0
200
0610
0
1
0
f)
400
0230
0
0
1
0
800
0340
0
0
0
1
I
TABLE 4 - 2
4.
Check -1200 Feet Correction according to the following truth
table, TABLE 4 - 3.
.
Also check for the correct binary outputs when dialing any altitude code which results in an incorrect display.
4 - 14
ALTITUDE
•
TRANSPONDER
DIAL
SETTING
PIN 9
IC38
PIN 6
IC38
PIN 2
IC38
PIN 15
IC38
PIN 6
IC37
PIN 2
IC37
PIN 15
IC37
o'
0620
0
0
0
0
0
0
0
1K
0320
1
0
0
0
0
0
0
2K
0520
0
1
0
0
0
0
0
4K
4720
0
0
1
0
0
0
0
8K
6620
0
0
0
1
0
0
0
16K
3620
0
0
0
0
1
0
0
32K
1624
0
0
0
0
0
1
0
64K
0626
0
0
0
0
0
0
1
TA3LE 4 - 3
·5.
Check 7 Bit Binary to BCD Converter by dialing an altitude 'Jode
that results in an incorrect altitude display. The truth table
(TABLE 4 - 4) for IC39, IC40 and IC41 is as fellows:
4 - 15
,....-------------.=--_....
~---------------
,
INPUTS
O~j'T.p
I
.....7'rs
.
,
I•
PIN 14
E
PIN 13
D
PIN 12
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
0
1
1
1
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
1
0
0
0
0
0
0
0
0
1
1
1
I
1
1
1
1
1
1
1
1
0
0
0
0
C
0
0
0
1
1
PIN 11
B
PIN 10
A
PIN 6
Y6
PIN 5
Y5
0
0
1
1
0
1
0
0
0
(\
1
0
0
0
0
0
1
1
0
1
0
1
0
0
0
0
0
0
1
1
1
0
0
1
1
0
1
0
1
0
0
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1.
0
1
0
1
1
1
0
0
0
0
1
~
0
0
1
1
0
1
0
1
0
0
0
0
1
1
1
1
1
1
1
0
0
0
1
1
1
1
0
0
Q .
1
0
0
0
0
0
0
0
i
0
(\
1
0
~
0
1
0
1
1
1
1
0
0
0
0
0
1
f)
1
0
0
1
1
0
1
0
0
1
0
0
0
1
0
0
1
0
0
1
1
1
0
0
0
1
0
0
0
1
1
1
1
0
1
1
0
1
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
,
1
1
1
TABLE 4 - 4
4 - 16
0
0
PIN 4
Y4
PIN 3
Y3
0
0
0
0
0
0
0
0
1
0
0
,
1
1
1
0
0
0
PIN 2
Y2
PIN 1
Yl
0
0
1
0
1
0
1
1
0
1
0
0
1
0
1
0
0
0
1
0
0
1
0
1
0
0
1
0
0
0
0
0
1
1
0
0
0
0
0
0
1
1
0
1
0
1
0
0
0
1
1
0
0
0
0
1
0
0
1
0
0
('
--
1.
0
1.
I
~
I
lIfiCROAMMETER (M2)
NUMITRON
READOUTS
RECEIVER
SENSITIVITY (R213)
MODE SWITCH (53)
FREQUEN CY POT
(H2O)
J::IATTERY METER (II-U)
POWER SWITCH (S5)
READOUT SWITCH
(84)
VIDEO TEST
POINT
%REPLY SWITCH
(52)
T - 33B FRONT PANEL CONTROL
FIG 4 - 3
.J - 17
•
FIG" _-I
.r -
lH
TRANSLATOR BD.
ED,
'--',:.,
._--,.....SCREWS
FIG 4 - 5
4 -1!l
EFBD. ____
ATTENUATOll ED
,-------- DECODEE BD
NUJ\1ITRON BD
TRANSLATOR BD
J\1Isc
BD
VIDEO BD
,:
\'lfJIf
FIG 4 - 6
4 - 20
FOR USE WITH UNITS SIN 383 AND BELOW
. i
i
JUMPER
R70
."
CR9
C41
C48
R49
C38
FA
ENCODER
BOTTOM
FIG 4-7
PAGE 4-21
FOR USE WITH UNITS SIN 3B3 AND BELOW
1
TPIO
1
Q14
TP9
Qll----4.!:
Q12----4~
1+---- LlO
Q13-------L~
f + - - - - IC7
TPll----+
H<---- IC6
IC3 - - - - - - ! .
IC9
IClO
;.<----IC5
IC12
-------IC4
ICll - - - - ! . ; g
TPB
Ii
ICB
IC2
Q10
Q20
TP7
IC21
+5V
Q19
+14V
R62
: " \ - - - - BATTERY CHECK ADJ.
IC20
R60
+9 ADJ.
+9V
ENCODER
TOP
FIG 4-8
PAGE 4-22
FOR USE WITH UNITS SIN 363 AND 6ELOW
. ENCODER
COMPONENT
SOLDER
SIDE VIEW
fig 4-9
ENCODER BOARD
4-23
SIDE VIEW
fig 4-10
FOR USE WITH UNITS SIN 384 AND UP
TPlO
Q14
TP9
Qll
Q
LIO
Ql3
IC7
TPll
IC6
IC3
IC9
ICIO
-i----IC5
ICl2
7---IC4
ICl1----~
+---TP8
ICB
!oi---!C2·
QlO
Q20 - - - - - : i t ' !
IC21
+14V-_ __
~--
IC20
R62
BATTERY CHECK ADJ.
R60
+9 ADJ.
+9V
ENCODER
FIG 4-11
PAGE 4-24
FOR USE WITH UNITS SIN 3B4 AND UP
FOR USE WITH UNITS SIN 3B4 AND UP
CliMPONENT
FIG
SlOE
SOLDER
VIEW
FIG
4-12
4 - 25
SlOE VIEW
4-13
T-33B & T-33C A/R TRANSPONDER RAMP TEST SET
ENCODER BOARD
lRV 10% (TV) , CRL/DD-221
500V 10% , ETP/801-000-X5F0102K
1KV 10% ,CRL/DD-152
35V 20%, SPR/5C023104X8250B3
35V 20%, SPR/19SD27SX0035SB
10V 20%, SPR/19SDlO7X0010LA3
SV 20%, SPR/196D337XOOOSMA3
500V 5%, SAN/DM195F271J
500V 5%, SAN/DM195F331J
~F 50V 5%, TRW/X463UW
50V 20%, SPR/7C02347X0500E
10
11
12
13
14
15
DIODE
DIODE
DIODE
DIODE
SI
SI
SI
SI
REC
SIG
ZEN
ZEN
IS
HEAT
SINK
TSTR,
lER/LE66B1
17
IND - VAR
120-280
~,
18
19
IC
'20
IC
21
IC
22
IC
3
4
5
S
7
8
9
-
220 pF
FXD DISC
1K
pF
FXD DISC
• 0015 ~F
FXD DISC
FXD DISC
0.1 ~F
27
ELECT, TA
~F
ELECT, TA
100 ~F
ELECT, TA
300 ~F
270 pF
FXD DM
330 pF
FXD DM
FXD MET, POLYS 0.1
FXD MNL
0.47 ~F
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
1
2
34
35
36
37
SOCKET
SOCKET
socrmT
38
39
40
TSTR N SI SH
TSTR P SI SH
TSTR UJT P SI
33
- FXD
- FXD
- FXD
- FXD
- FXD
- FXD
- FXD
- FXD
-. FXD
- FXD
- FXD
-VAR
COMP
COMP
COMP
COMP
CaMP
CaMP
CaMP
COMP
CaMP
MET FLM
MET FLM
CER
TSTR,
TSTR,
IC ,
200V
75V
2.4ZV
3.6ZV
IN2069
1N4148
IN4370A
IN5227A
LM309H,
N-B
SN74LOON
T-I
SN74LSOON ,
T-I
SN74L04N,
T-I
SN74LS04N,
T-I
SN74L10N,
T-I
SN74LS10N,
T-I
SN74L95N,
T-I
SN74LS95BN, T-I
JC
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
23
24
25
26
27
28
29
30
31
32
CIRCUIT
DESIGNATION
DESCRIPTION, MFR/MFR PN
ITEM
100Q
470Q
680Q
1/4W
1/4W
1/4W
mQ
l/'IW
1. 5KQ 1/4W
2.2KQ 1/4W
3.31W 1/4W
4.7KQ 1/4W
10KQ
1/4W
2. 21KQ 1/4W
49.4KQ 1/4W
500n
10% :
FT39Q4 ,
FT390S ,
D5Kl:
0.4W
D.5W
PD
PD
, A-B/CB1011
, A-B/CB4711
, A-B/CBS8ll
, A-B/CB1021
, A-B/CB1521
, A-B/CB2221
: A-B/CB3321
, A-B/CB4721
: A-B/CBI031
TYPE RN6De: MPE
TYPE RN6De: MPE
A-B/ZV5011
lEH/MPT-4003-1
lEH/MPT-S003-1
AUG/314-AG5D-2R
C33
C34
C27
C44
3
1
2
1
1
1
1
ol
TC-94
TC-97
TC-122
TC-1S0
TC-1S8
TC-174
TC-50-1
TC-50-2
TC-122-A
TC-139
1
XQ20
1
TH-3-A
L10
1
TC-192-A
2
1
TLM309H
TSN74LOON
TSN74LSOON
TSN74L04N
TSN74LS04N
TSN74L10N
TSN74LS10N
TSN74L95N
TSN74LS95BN
1C20,21
IC3
Je3
1C2,12
1C2,12
ICll
Jell
IC4 - 10
IC4 - 10
R42,64
R46.50
R31
R39, 43, 48, 52
R41
R32 - 34, 38, 63
R70
R35, 40, 49,65
R36,37
R59
R30
RSO, 62
Qll - 13
Q19
Q10
4 - 2S
1
CR8
CR12
XQ10 - 13,19
XIC20,21
XIC2 - 12
F-B
F-S
GE
1
4
TD-16
TD-19-A
TD-19-B
TD-21-1
CRG, 7, 9
T-33B )
T-33C )
T-33B )
T-33C)
T-33B )
T-33C )
T-33B)
T-33C )
10%
10%
10%
iO%
10%
10%
10%
10%
10%
1%
1%
C4-0, 43
C42
CRll
.75A
MLR/9056
( For
( For
( For
(For
( For
(For
(For
(For
C38 F.A.
C29, 30, 35, 37
C28
C31, 32. 41
C36
TIC PART #
1
3
1
1
2
2
1
1
7
7
2
2
1
4
1
5
1
4
2
1
1
2
5
2
11
3
1
1
TR-145
TR-151
TR-153
TR-ISS
TR-157
TR-159
TR-161
TR-1S3
TR-167
TR-93-C
TR-75
TP-38-A
TS-34
TS-36
TS-42-A
TT-32
TT-33
TT-16
COMPONENT
FIG
SOLDER
SIDE VIEW
FIG
4-12
FOR T -33C/T -43C
4-26A
SIDE VIEW
4-13
•
• CHASSIS GND
• CHASSIS GNO.
FOR T -33C1T -43C
DECODER BOARD
4-268
+ - - - - - - - Lll
Ql
~------------·TP15
IC14-------di2~~~
IC13------
TP12
ICIQ--------Hi'i
TP13
IC1 7 - - - - - - - - - t
IC16-------'-,~
T P I 4 - - - - - -....,
IC15------j::-c
+5V-
DECODER
fig 4-14
4-27
DECODER
• CHASSIS GND
• CHASSIS GND.
SOLDER SIDE VIEW
FIG 4 - 16
COMPONENT SIDE VIEW
FIG 4 - 15
DECODER
4 - 28
T-33B & T-33C A/R TRANSPONDER R~MP TEST SET
DECODER BOARD
-
470
FXD DM
620
FXDDM
FXD CER DISC lK
FXD CER DlSC 2K
FXD CER DlSC 0.1
pF
pF
pF
pF
TC-50-A
TC-51
TC-94
TC-9B
TC-122
CRI0
1
TD-16
Lll
1
TC-192-A
IC13
IC14
IC14
IC15 - 19
IC15 - 19
1
1
1
5
5
TSN7400N
TSN74L04N
TSN74LS04N
TSN74L95N
TSN74LS95BN
R69,7B
R67
R79
R6G, 68, 75
R77
R74
R71.76
R72.73
2
1
1
3
1
1
2
2
TR-145
TR-151
TR-153
TR-155
TR-157
TR-159
TR-163
TR-167
AUG 314-AG5D-2R
IEH MPT -4003-1
X1C13 - 19
XQ15 -18
7
4
TS-42-A
TS-34
F-S
RCA
Q15 - 18
Q21
4
1
TT-32
TT-43
6
DIODE
SI
IN2069
7
JND - VAR
120-2BO
~H
B
9
IC
IC
IC
IC
IC
SN7400N,
SN74L04N ,
SN74LS04N ,
SN74L95N,
SN74LS95BN
RES
RES
RES
RES
RES
RES
RES
RES
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
COMP
COMP
COMP
COMP
COMP
COMP
COMP
COMP
19
20
SOCKET
SOCKET
IC ,
TSTR,
21
22
TSTR
TSTR
FT 3904 ,
40318 ,
TIC PART #
1
1
1
1
2
CAP
CAP
CAP
CAP
CAP
11
12
13
14
15
16
17
IB
500WVDC 15% ,SAN/DM195F4715
500WVDC 5% , SAN/DM195F621J
500WVDC 10% , ETP/BOI-000X5FOI02K
500WVDC 20% : ETP/SOI-OOOZ5U2D2P
25WVDC 20% , SPR/5C023104XB250B3
QTY
C51
C52
C47
C53
C49,50
1
2
3
4
5
10
CIRCillT
DESIGNATION
DESCRIPTION, MFR/MFR PN
~
~F
200V
,
MLR 9056
T-I
T-I
T-I
T-I
, T-
( For T-33B )
( For T-33C )
(For T-33B )
I (.For T-33C ).
100Q
470Q
6BOQ
lK
1.5K
2.2K
4.7K
10K
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
10% ,
10% ,
10% ,
10% :
10% ,
10% ,
10%,
10%,
A-B
A-B
A-B
A-B
A-B
A-B
A-B
A-B
4 - 29
CBI011
CB4711
CB6Bll
CBI021
CB1521
CB2221
CB4721
CBI031
IC34
~~
IC43
IC33_~.",,=
CR30
~~~~~--~------'C44
CR2
•
IC47
C46
31
I C 4 '_ _---'''-
TRANSLATOR BOARD
PAGE 4-30
D---~_~_ .... _ _
-o
R-I_~~
o-~·-----·--o
COMPONENT SIDE VIEW
FIG 4 -18
4 - 31
SOLDER SIDE VIEW
FIG 4 - 19
4 - 32
T-33B & T-33C A/R TRANSPONDER RAMP TEST SET
TRANSLATOR BOARD
CIRCUIT
DESIGNATION
DESCRIPTION, MFR/MFR PN
ITEM
1
CAP - FXD CER DISC 0.1 pF 25V 20%: SPR/SC023104X8250B3
2
DIODE
3
IC
4
IC
5
6
7
IC
IC
IC
8
9
IC
IC
IC
IC
IC
IC
10
11
GE
SIG
SN7400N,
SN74LSOON,
SN7402N:
SN74LS02N,
SN7406N,
SN7407N,
SN7408N:
SN74LS08N,
SN7445N,
SN7483N,
SN74LS83AN,
SN74185N:
SN7486N:
SN74LS86N,
IN90
1'-1
1'-1
1'-1
1'-1
1'-1
1'-1
1'-1
1'-1
1'-1
1'-1
1'-1
1'-1
1'-1
1'-1
180n
220n
2.7Kn
( For
( For
( For
( For
T-33B
T-33C
T-33B
T-33C
)
)
)
)
( For T-33B )
( For T-33C )
( For T-33B )
( For T-33C )
12
13
14
RES - FXD COMP,
RES - FXD COMP,
RES - FXD COMPo
15'
SOCKET
IC,
AUG/3I4-AG5D-2R
16
SOCKET
IC,
AUG/316-AG5D-2R
1/4W 10% : A-B/CB1811
1/4W 10% : A-B/CB2211
1/4W 10% : A-B/CB2721
<1
TC-122
CR2G - 31
6
TD-8
IC34
IC34
1
1
2
2
1
3
'1
1
1
3
3
4
3
3
TSN74LS02N
TSN7406N
TSN7407N
TSN7408N
TSN74LS08N
TSN7445N
TSN7483N
TSN74LS83AN
1
3
33
TR-147
TR-148
TR-160
11
TS-42-A
8
TS-42-A
IC32,35
IC32,35
IC36
IC29, 42,57
IC33
IC33
IC43
IC37, 38,45
IC37, 38, 45
le3D. 31, 44
IC30, 31,44
moo
RIOI, 121, 125
R97 - 99, 102 -120,
122 - 124. 126 -133
XlC29 - 36, 42,
44,47
XlC37 - 41, 43,
45,46
4 - 33
TIC PART #
eB(j - 68
IC 39, 40, ·Il, 46
( For T-33B )
( For T-33C )
SITL
TSN7400N
TSN74LSOON
TSN7402N
TSN74185N
TSN7486N
TSN74LS86N
Q8
Q9
Q7
Q6
TP6
~~,
~----TP5
----""':~tiII
L9
..l.----- RI8
T1
E~~F----ICI
METER
THRESHOLD
C13
La
L7
Q5
C4
Q29
C3
Q3
L5
L6
TP2
TPI
L2
":7m~ :.,.,.,.---~:--+
~
QI
rtF. BOARD
FIG 4 - 20
4 - 34
____
VI
@
.
~
~L3'"
~
....
cr~~
tt)
'V
~LI--C
L2
~!.'
C7
@I...·
c
•.••
~RI~"'~·
CI5
@@-R2.-e
-,Q
.
•
~.
~
~
L
i!!t...
~R3-e
R.F. BOARD
•
CHASSIS
.CHASSIS GND •
GND.
SOLDER SIDE VIEW
FIG 4 - 22
COMPONENT SIDE VIEW
FIG 4 - 21
R. F. BOARD
4 - 35
T-33B AIR TRANSPONDER RAMP TEST SET
R. F. BOARD
DESCRIPTION: MFR/MFR PN
ITEM
-
FXD
FXD
FXD
FXD
FXD
FXD
S
9
10
11
12
13
14
15
16
17
IS
19
20
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
CAP
-
FXD CER DIS C
FXD CHIP
FXD ELECT, TA
FXD ELECT, TA
FXD FT
FXD FT
FXD MNL
TRIM GL
TRIM CER
TRIM CER
TRIM CER
FXD CER TB
FXD CER TB
FXD TA TB
21
COVER:
22
CRYSTAL
23
24
25
DIODE
DIODE
DIODE
26
DIRECTIONAL COUPLER:
27
28
29
30
31
32
33
IND - FXD
IND - FXD
IND - VAR
IND - VAR
IND -VAR
IND - VAR
IND-VAR
34
INSERT
35
IC
4
5
6
7
BT
CER
CER
CER
CER
CER
47 pF
3.3 pF
47 pF
100pF
270 pF
1K pF
CAP
CAP
CAP
CAP
CAP
CAP
1
2
3
DISC
DISC
DISC
DISC
DISC
500V 10% :
lKV ± .5 pF:
500V 10% :
U;:V 10%:
3KV 10%:
500V 10% :
CIRCUIT
DESIGNATION
ETP/654-017-470K
CRL/DD-3R3
ETP/S31-000-X5FO-470K
CRL/DD-I0l
CRL/DD30-271
ETP/SOI-000-X5FOI02K
0.01 f.lF 500V 10%: ETP/Sll-000-Z5U0-I03M
100 pF mv 10%:
ATC/I00BI01KMS
15 f.lF 15V 10%:
SPR/196Dl56X9015JAI
100 f.lF 10V 20%:
SPR/196Dl07XOOI0LA3
50 pF 250V 10%:
AER/EF-5
500 pF 250V 10% :
AER/EF-5
0.47 f.l F 50V 20% :
SPR/7 C02347X0500E
S-S.5 pF lKV
ETP/563-013
2-S pF 350V
ETP/53S-011-A-2-S
3-15 pF 200V
ETP/53S-011-D-3-15
9-35 pF 200V
ETP/53S-011-D-9-35
2.2 pF 500V ±. 25 pF: ETP/301-000-COJO-2296
10 pF 600V ±. 5 pF : CRL/TCZ-I0
0.047 /.L F 200V
SPR/192P47392
C16
C46
C11,92
C19,23
CI0 F.A.
C5,6,15,17
IS,21
C22
C90
C24
C25,39
CS9,94
C12,14
C20,91
C3,4
C2
Cl
C13
C9
CS
C26
SI
SI
SI
SIG
SIG
VRT
1.0 f.l H
IS /.LH
TIC
TIC
TIC
.. TIC
TIC
PZO/TIC-S2
INS7A
IN414S
M20109:
MC1350P:
MOT
4 - 36
1
1
1
TSP-S
1
TC-315
1
2
2
TD-7
TD-lS-A
TD-17-B
1
OBD
1
1
1
1
1
TC-lS6
TC-199
TSP-3
TSP-6
TSP-7
TSP-S
TSP-4
XL8,XTI
2
TI-5
ICI
1
TMC1350P
Yl
L4
Ll,9
L2
L5
L6
L7
LS
GPC/SI3832-30
2
1
6
1
TIC/TGC-S
CRA/190-1
DEL/I9lG
2
TC-77-A
TC-70-A
TC-79
TC-S2
TV
TC-94
1
1
1
1
CR4.
CR5, 15
CR2,3
MOT
1
1
TIC PART #
TC-I05
TC-S3-C
TC-152
TC-16S
TC-SO
TC-92
TC-139
TC-5S
TC-60
TC-61
TC-65
TC-69
TC-74-A
TC-1l7
TK
12S.75 MHz:
QTY
2
2
2
2
2
1
1
2
1
T-33B A/R TRANSPONDER RAMP TEST SET
R. F. BOARD
DESCRIPTION: MFR/MFR PN
ITEM
22n.
5in.
36
37
RES - FXD COMP
RES - FXD COMP
38
39
40
41
42
43
RES
RES
RES
RES
RES
RES
-
FXD
FXD
FXD
FXD
FXD
FXD
COMP
COMP
COMP
COMP
COMP
COMP
44
45
46
47
4B
49
RES
RES
RES
RES
RES
RES
-
FXD
FXD
FXD
FXD
FXD
FXD
COMP 4.7K
COMP 10K
COMP 47K
COMP lOOK
COMP 150K
MET FLM 10K
50
RES - VAR CER
51
52
53
• SOCKET TSTR
SOCKET
IC
SOCKET
TSTR
54
SWlTCH
TGL
55
56
57
58
TSTR
TSTR
TSTR
TSTR
59
TRANSFORMER
SI
SI
SI
SI
N
P
N
N
SH
SH
AH
LA
10D.n.
22D.n.
27D.n.
330n.
470n.
11"'-
500K
1/4W 10%: A-B/CB2201
1/4W 10%: A-B/CB5105
(ON DIRECTIONAL COUPLER)
1/4W 10%: A-B/CB1011
1/4W 10%: A-B/CB2211
1/4W 10%: A-B/CB2711
1/4W 10%: A-B/CB3311
1/4W 10%: A-B/CB4711
1/4W 10%: A-B/CB1021
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
10%:
10%:
10%:
10%:
10%:
1% :
A-B/CB4721
A-B/CB1031
A-B/CB4731
A-B/CB1041
A-B/CB1541
TYPE RN60C
1/2W 10% : A-B/ZV5041
TIC
IEH/MPT-4003-1
IEH/MPT-4004-1
SPDT : C-K/n01MDC
FT-3904
FT-3906
2N5179
2N6305
F-S
F-S
ClRCllT
DESIGNATION
R26
R227
R10,86
R28
R4
R80
R25
R3,5,6,17 (F.A.)
20,27,29,44
RI, 2, 14
R15,83
R17
R19
R9
R21 (F. A.),
24 (F. A.)
RIB
1
1
TR-140
TR-136-D
2
TR-145
TR-148
TR-148-A
TR-149
TR-151
TR-155
1
1
1
1
8
TR-163
TR-167
TR-175
TR-179
TR-181
1
TP-84-B
XIC1
XQ4, 6, 7,8,9
XQ1,2
1
5
2
TP-1186
TS-34
TS-35
Sl
1
TS-90-A
3
2
4
TT-32
TT-33
TT-36
TT-36-B
1
TSP-5
T1
4 - 37
TIC PART #
3
2
1
1
1
2
Q4,B,9
Q6,7
Q5
Q1,2,3,29
TIC
QTY
1
TV
R213 _ _ _~.
R 205 (ATTEN.
CAL.)
T-35
~---Q34
Q 33
! : r - - _ R200
(REPLY RATE
CAL.)
----!i:.I.
032 _ _ _-+.:~~
lC52D
RI92
(SLS ADJ.)
ATTENUATOR
BOARD
ATTENUATOR
BOARD
COMPONENT SIDE VIEW
FIG. 4-23
FIG. 4-24
4-38
T-33B & T-33C A/R TRANSPONDER RAMP TEST SET
ATTENUATOR BOARD
CIRCUIT
DESIGNATION
DESCRIPTION, MFR!MFR PN
ITEM
-
FXD
FXD
FXD
FXD
FXD
100
CHIP
CER DIBC 100
ELECT TA 22
ELECT TA 100
470
FT
I
2
3
4
5
CAP
CAP
CAP
CAP
CAP
6
7
B
DIODE SI SIG
DIODE SI ZEN
DIODE PIN
9
IC
IND - FXD
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
-
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
FXD
IKV
IKV
35V
10V
500V
10%
10%
10%
10%
20%
ATC!IOOBIOIKMS
CRL!DD-101
SPRI196D226X9034PE4
SPR!196DI.07X00IOLM3
SPT!S4-794-001
75V
IN4148
11V
IN4741
H-P
50B2-30BO
,
:
T-I
T-I
( For T-33B )
(For T-33C )
O. I Iili'
NYT/DD-0.10
MET FLM
MET FLM
MET FLM
MET FLM
MET FLM
MET FLM
COMP
COMP
COMP
COMP
COMP
COMP
COMP
COMP
COMP
COMP
IKQ
l/BW
2. 2KQ l!BW
3. 321m l/BW
5. BIm l!BW
101W l/BW
53.6KQ l!BW
27Q
1/4W
47Q
1!4W
91Q
1!4W
180Q 1!4W
680Q 1!4W
1KQ
1!4W
1. 5KQ 1!4W
1. BKQ 1!4W
2.7Im 1/4W
4.7I(Q 1/4W
1% TYPE RN55C ,
1% TYPE RNS5C ,
1% TYPE RN55C ,
1% TYPE RN55C ,
1% TYPE RN55C ,
1% TYPE RN55C
10%
A-B/CB2701
10%
A-B/CB4701
10%
A-B/CB9101
A-B/CBIB11
10%
10%
A-B!CB6B11
10% , A-B!C1021
10% : A-B/CI521
10% , A-B/CBIB21
10% : A-B/CB2721
10% , A-B/CB4721
2
I
3
I
2
TC-B3-C
TC-82
TC-IS6
TC-16B
TC-BB-A
eR3S, 36, 37
3
1
2
TD-19-A
TD-19-D
TD-23-B
IC52
I
'I
TSN74L03N
TSN74LS03N
LI2,I3
2
TI-I
R206 F.A.
R214
R201
RI9B
RI99
R197
R217
R215
R219
R216,218
R203
R191. 193, 211
R195
R202
R222 F.A.
R1BS, 189, 194,
I
I
I
I
I
I
I
I
1
2
I
3
I
I
I
9
OBD
OBD
OBD
OBD
OBD
OBD
TR-141
TR-142
TR-219
TR-147
TR-153
TR-155
TR-157
TR-158
!C52
MPE
MPE
MPE
MPE
MPE
MPE
TIC PART #
C85,86
CBI
cao, 82, 84
CB3
CB7, BB
CR34
CR3B,39
,
SN74L03N
SN74LS03N
10
pI
pI
p.F
p.F
pF
QTY
TR-163
196,204,207,208,
27
28
30
31
32
33
34
35
36
SOCKET
SOCKET
IC
TSTR
37
3B
TSTR
TSTR
SI
SI
29
-
8.2KQ 1!4W 10% , A-B/CBB221
6BQ
IW
10% , A-B/CB6BOI
91Q
1W
10% , A-B/GB9101
82011
IW
10% , A-B/GB 8211
5KQ
BEK/62PR5K
1!2W
10KQ 5W
10% , CRL/WW103
251W 1/2W
BEK/62PR25K
500lm 1/2W 10% , A-B!ZV5041
COMP
COMP
COMP
COMP
CER
WW
NAR CER
VAR CER
RES
RES
RES
RES
RES
RES
RES
RES
FXD
FXD
FXD
FXD
VAR
VAR
,
,
,
N
P
A UG!314-AG5D-2R
IEH!MPT-4003-1
SH
SH
FT3904
FT3906
F-S
F-S
4 - 39
209, F.A., 212
R210 F.A.
R220
R221
R190
R192,202
(FP)
R213
R2DO
R13
1
I
1
1
2
1
1
I
TR-237-D
TR-237-A-1
TR-241-D
TP-5B-A
TP-69
TP-75-B
TC-B4-C
XIC52
XQ32 - 3S
1
4
TS-42-A
TS-34
Q32
Q33 - 35
1
3
TT-32
TT-33
+5V
----i/
~----IC26
i H + - - - - 1C 22
Vl----
V2----"
V3----
~i_----IC25
IC2B------'
NUMITRON
FIG
4-25
JUMPER
COMPONENT SIDE
FI G 4 - 26
SOLDER SIDE VIEW
FI G 4 - 27
VIEW
4 - 40
T-33B A/R TRANSPONDER RAMP TEST SET
NUMITRON BOARD
DESCRIPTION: MFR/MFR PN
ITEM
1
CAP - FXD CER DISC 0.1 UF 25V 20% : SPR/5C023104X8250B3
2
3
IC
IC
4
NUMITRON
6
7
8
SOCKET
Ie: AUG/314-AG5D-2R
IC: AUG/316-AG5D-2R
SOCKET
SOCKET TUBE: TIC
CD-2501E:
SN7406N :
TUBE
RCA
T-I
DR2110 :
RCA
4 - 41
CIRCUIT
DESIGNATION
QTY
TIe PART #
C56,57
2
TC-122
IC22 - 25
IC26 - 28
4
3
TCD-2501E
TSN7406N
V1- 4
4
TT-54
XIC26 - 28
XIC22 - 25
XVl-4
3
4
4
TS-42-A
TS-42-B
TS-30-A
J2 BATTERY SUPPLY
CONNECTOR
-l<----QI
F2
Q2
-+---Q3
05-1
Q4
Fl
FIG 4 - 28
SWITCH
I
R87
I
COMMON
I
PLUS 14V
·
B
I
SWITCH
051
(
.
"
C60
............. C ..._,.;,.
.
.:
.
FI
i
CR20
.1
t";;;,\l
CRI9
1
CRI?
"
L1"
"."
/.
.'.
TPJ6
COMPONENT SIDE VIEW
FIG 4 - 29
BATTERY CHARGER
4 - 42
SOLDER SIDE VIEW
FIG 4 - 30
BATTERY CHARGER
T-33B
AIR
TRANSPONDER RAMP TEST SET
BATTERY CHARGER BOARD
DESCRIPTION, MFR/MFR PN
1
2
3
4
CAP
CAP
CAP
CAP
-
FXD
FXD
FXD
FXD
ELE CT
ELECT
ELECT
MY
100 JJ. F 20V 20%: SPR/196DI07X0020MA3
100 JJ. F 50V
SPR/TUA-1310
100 JJ. F25V
SPR/39D228G025HP4
0.022 u F 100V 10%: CDE/WMF1522
REC
REC
SIG
1N2069
1N4719 :
1N4148
Fl
F2
1
1
TF-18
TF-22-B
EMC/5075-139-5
P2
1
TJ-5-B
GE/67
DS-l
1
TL-l-A-l
2
1/2A , BUS/MDL SLO-BLO
10
JACK:
11
LAMP,
12
13
CLIP - MTG FUSE
CLIP - MTG LAMP,
14
15
16
17
RES
RES
RES
RES
18
19
SOCKET
SOCKET
TSTR:
TSTR:
20
21
TSTR
TSTR
TSTR
TSTR
N SH
P SH
P SP
P AP
9
22
23
-
3A
FXD
FXD
FXD
FXD
SI
SI
SI
SI
1
2
TC-1S9-A
TC-l71
TC-176-C
TC-I08
2
FUSE
FUSE
8
2
1
TIC PART #
TD-16
TD-19-1
TD-19-A
SI
SI
SI
7
C61,64
C65
C60
C62, 63
QTY
CR17,20,24,25
CR18,19,21
CR22,23
DIODE
DIODE
DIODE
5
6
CIRCUIT
DESIGNATION
MOT ONLY
,BUS/AG C-3
CaMP
COIl1P
COMF
CaMP
LIT/10I002
AUG/6012-16CC
~:'!0J1.
1/4W 10%: A-B/CB2211
4.7Kn 1/4W 10%: A-B/CB4721
10Kn 1/4W 10%, A-B/CB1031
!.2Kn. 1/4W 10%: A-B/CB2231
IEH/MPT-4003-1
IEH/MPT-6003-1
FT3904:
IT3906,
2N4234
2N4237
XFI,XF2
XDS-1
1
TC-188-B
TC-179-1
R9S - 96
R87, 88, 89, 94
R90, 93
R9l, 92
2
4
2
2
TR-148
TR-163
TR-IS7
TR-l71
3
TS-34
TS-36
XQ23 - 25
XQ26,27
F-S
F-S
Q24,25
Q23
Q26
Q27
4 - 43
4
3
2
2
1
1
1
TT-32
TT-33
TT-34-A
TT-34-B
Q28 _ __
CR16 _ __
=
Q22 _ _ _ _
COMPONENT SIDE VIEW
FIG 4 - 31
FIG 4 - 32
Mise BOARD
!,:C;i
···-R223·~;',;~J11
··-R225-.1j(
..r
.~::.-
:':"CR40";'
COMPONENT SIDE VIEW
VIDEO BOARD
4 - 44
FIG 4 - 34
T-33B A/R TRANSPONDER RAMP TEST SET
MISCELLANEOUS BOARD
DESCRIPTION: MFR/MFR PN
ITEM
SI SIG
1N4148 : MOT
1
DIODE
2
3
4
5
6
7
8
RES FXD COMP 270.n. 1/4W 10%
RES. FXD COMP 680n 1/4W 10%
RES FXD COMP 4.7Kn. 1/4W 10%
RES FXD COMP 10K" 1/4W 10%
RES FXD MET FLM 4.99K 1/4W 1%
SOCKET TSTR : IEH/MPT-4004-1
TSTR SI N SH FT3904 : F-S
A-B/CB2717
A-B/CB68ll
A-B/CB4721
A-B/CB1031
: TYPE RN606
CIRCUIT
DESIGNATION
QTY
TIC PART #
CRIB
1
TD-19-A
R8G
R23
R58,82,84
R83
R81
1
1
3
1
1
XQ22,28
2
Q22,28
2
TR-148-A
TR-153
TR-163
TR-167
OBD
TS-36
TT-32
T-33B A/R TRANSPONDER RAMP TEST SET
VIDEO BOARD
~
1
•
DESCRIPTION: MPH/MPH PN
DIODE
SI
2
3
4
5
RES-FXD
RES-FXD
RES-FXD
RES-FXD
COMP
COMP
COMP
COMP
6
TSTR
SI P
1N4148
SIG
laOA 1/4W
1K
1/4W
3.31( 1/4W
6.81( 1/4W
SH
10%: A-B/CBlOll
10%: A-B/CB1021
10%: A-B/CB3321
10%: A-B/CB6821
FT3904:
F-S
4 - 45
CIRCUIT
DESIGNATION
QTY
TIC PART if
CR40
1
TD-1S-A
R226
R225
R224
R223
1
1
1
1
TR-145
TR-155
TR-161
TR-1G5
Q36
1
TT-32
DIRECT COUPLING
CONNECTOR
J5
ANTENNA _ _ _.....:...:;;.;
CONNECTOR
J3
~_~_
NUNUTRONS
NUMITRON
REPLY
BOARD
METER
M2
'~~IIC1\\~-T~
MISC
BOARD
RCVR
SENS
R213
1090 MHz
ADJUST
R22
VIDEO
BOARD
READOUT
SWITCH
_--:7'
S4
% REPLY
VIDEO
OUTPUT
---:-----=..::
SWITCH
82
~~!:.-
\...
__'--
POWER
SWITCH
BATTERY
CHECK
Ml
MAW CHASSIS
FIG -1 - 35
4 - 46
T-33B A/R TRANSPONDER RAMP TEST SET
MAIN CHASSIS
DESCRIPTION: MFR/MFR PN
Trc
CrRCUlT
DESIGNATrON
QTY
P3
1
TSP-l
BT-l - 7
7
TB-7-C
1
1
TC-l-IA
TC-I-IB
TlC PART #
1
ANTENNA
2
BATTERY, Nr-CAD: G-E/41B004AA70
3
4
CHART, CONVERSION CODE-ta-ALTITUDE
CHART, CONVERSrON ALTITUDE-ta-CODE
5
CLIP, ANTENNA MOUNTING : AUG/6014-23A
2
TC-179-A
6
CABLE, COAX : ALF/RG5S C/U
1ft
TC-9
7
8
2
9
10
CONN,
CONN,
CONN,
CONN,
1
1
1
TC-250
TC-256
TC-265
TP-22-D
11
12
DUST CAP, COAX TNC
DUST CAP, COAX BNC
APL/78750
APL/31-006
1
1
TC-I-A
.TC-l-1
13
INDICATOR, CHARGER
TIC
1
TSP-I0
14
15
KNOB
KNOB
1
2
TK-16-Al
TK-16-A
16
LINE CORD 8' FT : BEL/17258-S
PI
1
TL-7
17
18
METER
METER
M2
Ml
1
1
TM-6-A
TM-7
19
RECEPTACLE : scr/ AG3G
Jl
1
TR-l
20
21
RES - VAR WW 10K 5W 10%
RES - V AR WW 50K 5W 10%
R213
R22
1
1
TP-69
TP-80-A
22
RUBBER, GASKET : MRC/ZX-4264 50-60 DNP
23
24
25
26
SWITCH,
SWITCH;
SWITCH,
SWITCH,
27
TRANSFORMER : T!C/T357
COAX
COAX
COAX
PLUG
1.2V
T!C
TIC
APL/74868 UG-88 C/U
APL/74S68 UG-SOS B/U (MOD BY TrC )
APL/77175 (PART OF ANTENNA ASSEMBLY)
CTC/329S-2-03
NOB/1-505D
NOB/50oD
DSI
(MODE SELECT)
( 10SO MHz ADJ, RCVR 8ENS)
TYPE BUT # 18-3
HOY/2015 0-50 IlA DC
EMC/802
ROTARY
TOGGLE
TOGGLE
TOGGLE
P5, XPDN
J5
P3
J2
CRL/WWI03
CRL/WW503
SPIOT : G-H/50CD36-01-1-ADJN
SPDT
AHH/TM-3-M
DPDT
C-K/7411-H
4P3T
C-K/7413-H
4 - 47
4 - 48 BLANK
42 in
TR-5-D
83
85
84
S2
1
1
1
1
TS-76
T8-78
T8-97
TS-S8
T2
1
TT-15-F
TEL-lliSTRUMENT ELECTRONICS CORP,
Feet
ABeD
Feet
ABCD
-1,000
-900
-800
-700
-600
0020
0030
0010
0430
3,000
3,100
3,200
3,300
3,400
4120
4130
4110
4510
4530
-500
-400
-300
-200
-100
0420
0460
0440
0640
0660
3,500
3,600
3,700
3,800
a,900
000
100'
200
300
400
0620
0630
0610
0210
0230
500
600
700
0220
0260
0240
0340
0360
4,600
4,700
4,800
4,900
0320
0330
0310
0710
0730
ALTITUDE-to-CODE CONVERSION CHART
ABeD
Feet
ABeD
7,000
7,100
,7,200
7,300
7,400
6020
6030
6010
6410
6430
11,000
11,100
11,200
11,300
11,400
2120
2130
2110
2510
2530
4520
4560
4540
4740
4760
7,500
7,600
7,700
7,800
7,900
6420
6460
6440
6640
6660
11,500
11,600
11,700
11,800
11,900
2520
2560
2540
2740
2760
4,000
4,100
4,200
4,300
4,400
4720
4730
4710
4310
4330
8,000
8,100
8,200
8,300
8,400
6620
6630
6610
6210
6230
12,000
12,100
12,200
12,300
12,400
2720
2730
2710
2310
2330
4, SOD
4320
4360
'~260
8,500
8,600
8,700
8,BOO
8,900
6220
6260
6240
6340
6360
12,500
12,600
12,700
12,800
12,900
2320
2360
2340
2240
2260
5,000
5,100
5,200
5,300
5,400
4220
4230
4210
4610
4630
9,000
9,100
9,200
9,300
9,400
6320
6330
6310
6710
6730
13,000
13,100
13,200
13,300
13,400
2220
2230
2210
2610
2630
1,900
0720
0760
0740
0540
0560
5,500
5,600
5,700·
5,800
5,900
4620
4660
46·10
4440
4460
9,500
9,600
9,700
9,BOO
9,900
6720
6760
6740
6540
6560
13,500
13,600
13,700
13,800
13,900
2620
2660
2640
2440
2460
2,000
2,100
2,200
2,300
2,400
0520
0530
0510
0110
0130
6,000
6,100
6,200
6,300
6,400
H20
4430
4410
4010
4030
10,000
10,100
10,200
10,300
10,400
6520
6530
6510
6110
6130
14,000
14,100
14,200
14,300
14,400
2420
2430
2410
2010
2030
2,500
2,600
2,700
2,800
2,900
0120
6,500
6,600
6,700
6,800
6,900
4020
4060
4040
6040
6060
10,500
10,600
10,700
10,800
10,900
6120
14,500
14,600
14, 700
14,800
14,900
2020
2060
2040
3040
3060
BOO
900
1, 000
1,100
1,200
1,300
1,400
1,500
1,600
1,700
1, BOO
DUO
OHiO
0140
4140
4160
4340
4240
Feet
6HiO
6140
2140
2160
PAGE 1
Feet
ABeD
Feet
ABCD
Feet
ABGD-
Feet
15, 000
15,100
15,200
15,300
15,400
3020
3030
3010
3410
3430
19,000
19,100
19,200
19,300
19.400
7120
7130
7110
7510
7530
23,000
23,100
23,200
23,300
23,400
5020
5030
5010
5410
5430
27,000
27. fOO
27,200
27,300
27,400
1120
1130
1110.
1510
1530
15,500
15,600
15,700
15,800
15,900
3420
3460
3440
3640
3660
19.500
19,600
19,700
19,800
19,900
7520
7560
7540
1740
7760
23,500
23,600
23,700
23,800
23,900
5420
5460
5440
5640
5660
27,500
27,600
27,700
27,800
27,900
1520
1560
1540
1710
1760
16,000
16,100
16,200
16,300
16,400
3620
3630
3610
3210
3230
20,000
20,100
20,200
20,300
20,400
7720
7730
7710
7310
7330
24,000
24,100
24,200
24,:'100
24,400
5620
5630
5610
5210
5230
28,000
28,100
28,200
28,300
28,400
1720
1730
1710
1310
1330
16,500
16,600
16,700
16,800
16,900
3220
3260
3240
3340
3360
20,500
20,600
20,700
20,800
20,900
7320
7360
7340
7240
7260
24,500
24,600
24,700
24,800
24,900
5220
5260
5240
5340
53GO
28, 500
28,600
28,700
28,800
28,900
1320
1360
1340
1240
1260
17,000
17,100
17,200
17,300
17,400
3320
3330
3310
3710
3730
21,000
21,100
21,200
21.300
21,400
7220
7230
7210
7610
7630
25,000
25,100
25,200
25,300
25,400
5320
5330
5310
5710
5730
29,000
29,100
29,200
29,300
29,400
1220
1230
1210
1610
1630
17.500
17,600
17,700
17,800
17,900
3720
3760
3740
3540
3560
21,500
21,600
21, 700
21,800
21,900
7620
7660
7640
7440
7460
25,500
25,600
25,700
25,800
25,900
5720
5760
5740
5540
5560
29,500
29,600
29,700
29,800
29,900
1620
16GO
1640
1440
H60
18,000
18.100
18,200
18,300
18,400
3520
3530
3510
3110
3130
22,000
22,100
22,200
22,300
22,400
7420
7430
7410
7010
7030
26,000
26,100
26,200
26,300
26,400
5520
5530
5510
5110
5130
30,000
30,100
30,200
30,300
30,400
1420
1430
1410
1010
1030
18,500
18,600
18,700
18,800
18,900
:n20
3160
3140
7140
7160
22,500
22,600
22,700
22,800
22,900
7020
7060
7040
5040
5060
26,500
26,600
26,700
26,800
26,900
5120
5160
5140
1140
1160
30,500
30,600
30,700
30,800
30,900
1020
1060
1040
1044
1064
ABCD
•
.,
TEL-IDSTRUMENT ELECTRONICS CORP.
•
ALTITUDE-to-CODE CONVERSION CHART
PAGE 2
Feet
ABeD
Feet
ABeD
Feet
ABeD
Feet
ABCD
Feet
ABCD
Feet
ABCD
Feet
ABCD
Feet
ABeD
:n,DOO
31,100
31,200
31,:100
:n, '100
1024
1034
35, 000
512<1
5134
51B
5514
553'!
39,000
39,100
39,200
39,300
39,400
702<1
7034
7014
7434
43,000
43,100
43,200
43,300
43,400
3124
3134
3114
3514
3534
47,000
47,100
47,200
47,300
47, ·100
2024
2034
201<1
2'114
2434
51.000
51,100
51,200
51,300
51,400
6124
6134
6114
6514
6534
55.000
55,100
55,200
55,300
55,400
4024
·1034
4014
4414
4134
59,000
59,100
59,200
59,300
59,400
0124
013<1
0114
0514
0534
552<1
5564
554<1
5744
576<1
39,500
39,600
39,700
39,800
39,900
7424
74M
7'14'1
7644
7664
43,500
43,600
43,700
'13,800
43,900
3524
3564
354-1
3744
37M
47.500
47.600
'17,700
47,800
47,900
2424
6524
G5G,1
654,1
67,14
676,1
55,500
55,600
55,700
55,800
55,900
442<1
4464
2·14<1
26<14
266,!
51,500
51,600
51,700
51,800
51,900
59,500
59,600
59.700
59,800
59,900
052<1
056-1
0541
0744
071H
572'1
5734
57H
5314
5334
40,000
40,100
'10,200
40,300
40,'!OO
7624
7634
7614
7214
7234
4'1,000
44,100
4,.1,,200
4~, 300
44,400
3724
3734
3714
3314
3334
48.000
48,100
48,200
48,300
48,400
2624
283,1
2614
2214
2234
52,000
52,100
52,200
52.300
52.400
G724
673·.1,
6714
6334
56.000
56,100
56,200
56,300
56,400
60,000
60,100
60,200
60,300
60,400
0724
07340714
0314
033-1
532<1
5364
5344
5244
526<1
40,500
40,600
40,700
40,800
40,900
7224
7264
7244
73,14
7364
4<1,500
4·1,600
44,700
44,800
<H,900
332,13364
3344
3244
3264
48,500
48,600
48, 700
48,800
48,900
2224
2264
2244
2344
2364
52,500
52,600
52,700
52,800
52.900
6;124
636'1
G344
6244
5264
56,500
56,600
56,700
56,800
56,900
60,500
60,600
60,700
60,800
60,900
032,1
522.;1
523,1
5214
5614
5634
41, 000
41,100
41,200
41,300
H,400
7324
733,1
731'.1,
7714
773·1
45,000
45,100
'15,200
45,300
45,400
3224
3234
36I-!
363,1
49,000
49,100
49.200
49.300
49,400
232<1
2334
231'1
2714
2734
53,000
53.100
53,200
53,300
53,400
6224
6234
6214
6614
6634
57,000
57,100
57,200
57,300
57,400
4334
·13B
,171'1
4734-
61,000
61,100
61,200
61,300
61,400
022,1
023'1
021·1
41,500
,n, 600 .
41,700
n,800
41,900
7724
7764
7744
7544
7564
45,500
45,600
'15,700
,15,800
45,900
3624
366'1364'
3·144
346,1
49,500
49,600
.19,700
49,800
49,900
2724
2764
274+1
25<1..1
2564
53,500
53,600
53,700
53,800
53,900
6624
6664
6644
4724
4-76·1
4744
454·1
45fH
61,500
61,600
61,700
61,800
61,900
062'1
0661
OM'1
04·H
6464
57, SOD
57,600
57,700
57,800
57,900
2524
2534
2514
21H
2134
5<.1,,000
54,100
54,200
54,300
5,f,400
6424
6'134
6414
6014
6034
58,000
58,100
58,200
58,300
58.400
452,1
'1534
45B
41H
4134
62,000
62,100
62,200
62,300
62,400
0'124
013'1
2124
21tH
21<1,1
54,500
54,600
5'1,700
54.800
5'1,900
6024
6064
60,g
404-4
4061
58,500
58,600
58,700
58,800
58,900
<112'1
62.500
62,600
62,700
0024
006'1
00·f-.!
31,500
31,600
31,700
31,800
:n,900
101'1
35, lOa
35,200
141<1
1<1:).1
35,300
1424
35,500
35,600
35,700
1464
1<144
1644
1664
35,400
35,800
35,900
32,000
1624
36,000
32,100
32,200
32,300
32.400
1634
1614
36,100
36,200
1214
123·1
36,300
36,400
32,500
122<1
36,500
32,60a
32,700
32,800
32,900
1264
36,600
36,700
136·~
36,800
36,900
1241
134-4
33, 000
1324
37,000
33,100
1334
3:1,200
13B
17H
37,100
37.200
33,300
33,400
7414
3214
1734
37,300
37, '100
33,500
33,600
172'1
37,500
17G'~
33,700
174-1
37,60a
37.700
33,800
33,900
1544
156'1
37,800
37,900
5624
5664
5644
5444
546'1
34,000
34,100
!H,200
1524
1534
1514
1114
:H,400
113-1
5,12'1
543'1
5H4
5014
5034
42,000
'12,100
42,200
42,300
42,400
7524
753·1
7514
7114
7134
41i,000
46,100
·lG,200
41i,300
'Hi, ,lOa
3424
3434
3,1, :lOO
38,000
38, 100
38,200
38,300
38,400
3014
3034
50,000
50,100
50.200
50,300
50,400
34,500
112,1
1184
1144
5144
38,500
38,600
38,700
38,800
38,900
5024
5064
50,B
7044
70M
42,500
42,600
42,700
·12,800
42,900
712A
7164
7144
3144
3HH
'16,500
46,600
,lG,700
4(;,800
46,900
3024
3064
304+1
2044
2064-
50,500
50,600
50,700
50,800
50,900
3,1,600
34,700
34,800
:H,!JOO
516,1
3414
2<16'~
61H
61G'1
6314
6,144
44tH
4&!<!
4664
,1624
'163<1
461·1
4214
·1234
4224426-1
42·14
4344
,136,1
432·1
'1104
4144
0144
01fH
036'1
030.1,4
024-1:
026,1
06H
0634
046·1
041'1
DOH
OO:H
TEL-[NSTRUMENT ELECTRONICS CORP.
ABeD
Feet
,.
CODE-to-ALTITUDE CONVERSION CHART
ABeD
Feet
ABCD
Feet
ABCD
Feet
ABCD
Feet
ABCD
Feet
ABCD
PAGE 1
Feet
ABCD
Feet
0010
0020
0030
0040
0060
-800
-1,000
-900
1010
1020
1030
1040
1060
30,300
30,500
30,400
30,700
30,600
2010
2020
2030
2040
2060
14,300
14,500
14,400
14,700
14, GOO
3010
3020
3030
3040
3060
15,200
15,000
15,100
14,800
14,900
4010
4020
4030
4040
4060
6,300
6,500
6,400
6,700
6,600
5010
5020
5030
5040
5060
23,200
23,000
23,100
22,800
22,900
6010
6020
6030
6040
6060
7,200
7,000
7,100
6,BOO
6,900
7010
7020
7030
7040
7060
OllO
0120
0130
0140
0160
2,300
2,500
2,400
2,700
2,600
1110
1120
1130
1140
1160
27,200
27,000
27,100
26,800
26,900
2110
2120
2130
2140
2HiO
11,200
11.000
11,100
10,800
10,900
3110
3120
3130
3140
3160
18,300
18,500
1B,400
18,700
18,600
4110
4120
4130
4140
4160
3,200
3,000
3,100
2,BOO
2,900
5110
5120
5130
5}40
5160
26,300
26,500
26,400
26,700
26,600
6110
6120
6130
6140
6HlD
10,300
10,500
10,400
10,700
10!600
7110
7120
7130
7HO
7160
19,200
19,000
19,100
18,BOO
18,900
0210
0220
0230
0240
0260
300
500
1210
1220
1230
1240
1260
29,200
29,000
29,100
2B,BOO
2B,900
2210
2220
2230
2210
2260
13,200
13,000
13,100
12,800
12,900
3210
3220
3230
3240
3260
16,300
16,500
16,400
16,700
16,600
4210
4220
4230
4240
4260
5,200
5,000
5,100
4,BOO
4,900
5210
5220
5230
5240
5260
24,300
24,500
24,400
24,700
24,600
6210
6220
6230
6240
6260
B,300
8,500
8,400
8,700
8,600
7210
7220
7230
7240
7260
21,200
21,000
21,100
20,BOO
20,900
28,:100
2B,500
2B,400
28,700
28,600
2310
2320
2330
2340
2360
12,300
12,500
12,400
12,700
12,600
3310
3320
3330
3340
3360
17,200
17,000
17,100
16,800
16,900
4310
4320
4330
4340
4360
4,300
4,500
4,400
4,700
4,600
5310
5320
5330
5340
5360
25,200
25,000
25,100
24, BOO
24,900
6310
6320
6330
6340
6360
9,200
9,000
9,100
8,800
8,900
7310
7320
7330
7340
7360
20,300
20,500
20,400
20,700
20,600
5110
5120
5430
5440
5460
23,300
23,500
23,400
23,700
23,600
6410
6420
6430
644.0
6460
7,300
7,500
7,400
7,700
7,600
7410
7120
7430
7<140
7460
22,200
22,000
22,100
21,800
21,900
400
700
600
22,300
2~.500
22,400
22,700
22,600
0310
0320
0330
0340
0360
1,200
1,000
1,100
900
1310
1320
1330
1310
1360
0410
0420
0430
0440
0460
-700
-500
-600
-300
-400
1410
1420
1430
1440
1460
30,200
30,000
30,100
29,800
29,900
2410
2420
2430
2410
2460
14,200
14,000
14,100
13,800
13,900
3410
3420
3430
3440
3460
15,300
15,500
15,400
15,700
15,600
4410
4420
4430
4440
4460
6,200
6,000
6,100
5,800
5,900
0510
0520
0530
0540
0560
2,200
2,000
2,100
l,BOO
1. 900
1510
1520
1530
1540
1560
27,300
27,500
27,400
27,700
27,600
2510
2520
25::10
2540
2560
11,300
11,500
11,400
11,700
11,600
3510
3520
3530
3540
3560
18,200
18,000
IB,100
17,800
17,900
4510
4520
4530
4540
4560
3,300
3,500
3,400
3,700
3,600
5510
5520
5530
5540
5560
26,200
26,000
26,100
25,800
25,900
6510
6520
6530
6540
6560
10,200
10,000
10,100
9,800
9,900
7510
7520
7530
7540
7560
19,300
19,500
19,400
19,700
19,600
0610
0620
0630
0640
0660
200
000
100
-200
-100
1610
1620
1630
1640
1660
29,300
29,500
29,400
29,700
29,600
2G10
2620
2630
2640
2660
13,300
13,500
13,400
13,700
13,600
3610
3620
3630
3640
, 3660
16,200
16,000
16,100
IS, BOO
15,900
4610
4620
4630
4640
4660
5,300
5,500
5,400
5,700
5,600
5610
5620
5630
5640
5660
2·:1,200
24,000
24,100
23,800
23,900
6610
6620
6630
6640
6660
8,200
8,000
8,100
7, BOO
7,900
7610
7620
7630
7640
7660
21,300
21,500
21,400
21,700
21,600
0710
0720
0730
0740
0760
1,300
1,500
1,400
1,700
1,600
1710
1720
1730
1740
1760
2B,200
2B,OOO
2B,100
27,800
27,900
2710
2720
2730
2740
2760
12,200
12,000
12,100
11,800
11,900
3710
3720
3730
3740
3760
17,300
17,500
17,400
17,700
17,600
4710
4720
4730
4740
4760
4,200
4,000
4,100
3,BOO
3,900
5710
5720
5730
5740
5760
25,300
25,50{l
25,400
25,700
25,600
6710
6720
6730
6740
6760
9,300
9,500
9,400
9,700
9,600
7710
7720
7730
7740
7760
20,200
20,000
20,100
19,800
19,900
800
..
•
•
TEL-lNSTnUtllENT ELECTRONICS CORP.
CODE-to-ALTITUDE CONVERSION CHART
PAGE 2
ABeD
Feet
ABeD
Feet
ABCD
Feet
ABCD
Feet
ABeD
Feet
ABCD
Feet
DOH-
62,300
1014
31,200
102<1
10;\-!-
46,500
55,200
55, 000
62,700
62,600
lOH
1064
2064
3041
:J06·1
46,400
40,700
46,600
1024
403'1
DOH00ti<!
:11, 000
31,100
30,800
30,900
301<1
:lOU
3034
4014
1i2,:SOO
,17,200
47,000
47,100
46,800
46,900
46,300
0024
00:3-1,
2014
2024
2034
0114
012·!
50,200
1114
3'1,300
59,100
43,100
OH4
DIu'!
58,800
58,900
50,700
50,1l00
35,200
35,000
35,100
34,800
6144
50,800
316-1
71<1-1
42,500
42, ·!DO
.~2., 700
:J.!,600
21'14
216·!
:Jl2-!
3134
31+1
'13,000
0134
34,500
:H,'lOU
3'1,700
50,300
50,500
50,400
43,200
112.-!
l1:H
IH4
ll!H
211<1
2124
2134
:nH
5U,000
34,900
616·1,
50,900
7164
42,600
0214
022·!
023 11
G1,200
12H
122'1
123,1
n,300
32,500
2214
222·l
'~8, 300
'i8,500
32U
61,000
37,200
37,000
621·1
622,1-
53,200
32, ·!OO
22~H
2~+!
:12:H
32+1
321j.!
G234
32,700
32,600
48, -lOa
,18,700
48,600
721'1
722'l
'10,300
:1224
72a'1
72·1-4
'lU,70U
H,DOO
53,100
52,300
52,900
7264
·10,600
49,200
'19,000
4+1,300
41,500
6314
632<1
731-1
'11,200
52,500
2:J:J.1
7324
49,100
3a1<1
332'1
3:3a'l
33+1
52,300
232'1
633'1
6344
52,400
7334
73·14
7364
41,000
41,100
40,800
62,400
m,IOU
61,900
05H
59,:J(}O
0524
05:14
0544
056'!
59,500
06H
0624
0634
59, ·100
45,200
421-t
5(" :300
5214
45, 000
'!5,100
·14,800
422'~
51;, :::00
522,.1,
42;14
56,400
52:H
42·H
50, 700
5244
·126'~
[j{"600
5264
37,100
!lG, BOO
3H,900
57,200
53H
36,300
57,000
57,100
5324
:l1i,500
44,400
4314
·132'1
4334
36, ·lOO
4a44
4364
56,800
3364
4'1.700
'H,uOO
5334
5344
5u,900
5Jli-!.
36,700
36,600
341<1
46,200
55,300
55,500
38,200
46,000
46,100
'1<11-1
4..12-1
5,n-1
342·1
3434
3'1-14
346,1
45,900
3514
352·1
2534
35H
43,300
4a,500
43,400
25,14
25M
50,200
50,000
50,100
49,800
'13,700
'19,900
356·1
43,600
456·1
32,200
26B
48,200
361'1
45,300
32,000
32,100
31,800
31,900
262'1
362'1
45,500
2634
26,g
48,000
48,100
47,800
363,1
36,14
45,400
45,700
'16B
462·1
463·14644
2664
·17,900
366<1
45,600
27H
49,300
49,500
'19,400
371<1
1744
33,300
33,500
3:1,400
33,700
17(H
33,600
2764
+1,200
.t.!, 000
4<l,100
'13,800
4:1,900
13ti4
60,200
60,000
60,100
59,800
59,900
20'14
22fH
3:1,200
33,000
3:1,100
32,800
32,900
2:1H
234..1
23tH
48,800
48,900
'17,300
'17,500
H14
H2-l
H:H
31,300
24H
:.11, SOD
2,12'1
31,400
2434
1<1·14
l'lIN
31,700
31,600
2H-l
151'1
152-l
34,200
2514
2524
253·1-
1614
1624
071'1
072<1·
0734
07H
076·1
126,(
61,:100
61,600
7114
712·1
71:!4
'12,300
51,000
SH4
51G4
1564
OliGo!
51.200
53, fiOO
59, GOO
DUH
611-1
6124
61:;4
H6~
59,700
61,400
(i1,700
5,1,600
42,900
153·!
15·14
61,500
6064
3g,200
39,000
39,100
38,800
38,900
4.2,800
60,700
GO, GOO
0,134
6034
60,g
70H
7024
7034
704..1
70fi4
513'1
03H
044-1
0464
38,400
54,300
5-1,500
54,400
54,700
58,400
58,700
GO, ·100
62,000
62,100
In, BOO
6024
SIH
5124
O:J:l.!
62,200
6014
38,500
5B,300
58,500
1:114
132·1
133-!
134<1
OH-!
0,124
38,300
41H
,n2·1
'11344H4
6(),:mo
O:Jlj.!
Feet
5'1, BOO
54,900
O:lH
032'1
60,500
ABeD
40'14
4064
12<14
0264
Feet
5014
5024
5034
5044
506,1
GO,80D
1i0,900
02·{.!
ABeD
163·1
1tH4
166'!
171<1
172.4
_ 173'1
3'1,000
34,100
33,800
33,900
246·1
2724
2{3'1
27H
47,'100
47,700
·17,600
4!l,700
49, GOO
372<1
3734
a7M
3764
45,800
55,100
38,700
38,600
624,1
626,1-
6a64
51,ioo
53,000
52,700
52,600
40,500
40,400
40,900
6·1H
6424-
54,200
M:l4
6444
&1-,100
53,800
7-13·1
74.<H
39,400
39,700
39,600
7414
7424-
3!l,3{)O
,1<13·1
55,400
542·1
5434
4444
4464
55,700
54014
38,000
38,100
37.800
55,600
5464
37.900
64M
53,900
746-1
4514
58,200
58,000
'15~1<!
58,100
35,500
35,400
6514
652,16SH
51,JOO
51,500
51,400
4544
57,800
57,900
5514
5524
5534
5544
55tH
35,300
4524
35,700
35,600
654<1
6564
51,700
51, GOO
7514
752-1
7534
754<1
7564
56,200
5u,000
561,1
562-1
37,300
40,200
762'1
40,000
5634
37,400
53,300
53,500
53,400
7614
56,100
7634
40,100
5M4
37,700
53,700
4664
55,800
55.900
6GH
6624
663·!
66H
566·!
37,600.
66lH
53,600
7644
7fj64
39,800
39,900
4714
57,300
571'1
41,300
572·.1,
5734
57<14
57M
772'1
36,100
6734
41,500
41,400
35,BOO
674-4
6764
52,200
52; 000
52,100
51, SOO
51,900
7714
57,500
36,200
36,000
6714
4724
473'1
47'14
476·1
57,400
57,700
57,600
37,500
35,900
672·!
5-1·,000
3D, 500
42,200
.12,000
·12,100
41,800
41, 900
7734
7744
,ll,700
7764
41,600
,
ABBREVIATIONS
"
A ••••••••
AID . •.•..
AC . .... "
ADF ......
ADJ. • . . ..
AF ...
AH .......
AL ..... _.
AMP .....
AM ......
Ampere
Analog to digital
Alternating current
Automatic direction finder
Adjustment
Audio frequency
Amplifier high frequencies
Aluminum
Amplifier
Amplitude Modulation
AP, ....... Amplifier Power
AIR . ..... Altitude recording
0" • • •
ARINC ... Aeronautical Radio
ATe ...... Air traffic control
BCD ...... Binary coded decimal
BT ...•.. Button
c . . . . . . ..
Capa ciLor
CAP
Capacitor
CER ..... Cernmic (CAP)
Cermit
(RES)
eM ...... Centimeter
COAX .... Coaxial
COMP .... Composition
CONN .... Connector
CP ....... Cadmium Plate
eR ....... Diode
DI A •• ••••
dB .......
dEm ......
DC .......
Digital to nnalog
Decibel
Decibel referred to 1 MW
Direct current
DEPC .... Deposited carbon
nET ......
DM .......
DME .....
DNP ......
DPDT ....
Detector
Dipped Mica
Distance measuring equipment
Duro neoprene
Double-pole double throw
ELECT .•. Electrolytic
F ...•.. .. F.arad
FA ...... , Factory adjust
FET ...... Field effect transistor
F/F • •.•.• Flip Flop
FM. " ... ,
FP ...... ,
FREQ ... ,
FT ..••.••
FXD •••••
Frequency modulation
Front panel
Frequency
Feedthru
Fixed
GE .......
GL .......
GRD .....
GS .•...•.
Germanium
Glass
Ground
Glide Slope
H .•....•.
HF .......
HG .......
HM .•....•
Henry
High frequency
Mercury
Hot molded
HS . . • • . •• High Speed
HV •...••. High Voltnge
Hz ....... Hertz
Ie .......
ID .......
IF ........
ILS .......
IN .•......
IND ......
INS ......
TNT ......
Integrated circuit
Inside diameter
Intermediate frequency
Instrument landing system
Inch
Inductor
Insulation
Internal
Kg ....•. , Kilogram
Kn ., ••.•• Kiloohm
KHz ••••• , Kilohertz
KV ••• '•••• Kilovolt
L . ••••••• Inductor
LA . • . . • •. Low noise amplifier
lb .••••••• Pound
LOC ••••• Localizer
M ..••.••. Meter
MA ...... Mill iampere
MAX ..... Maximum
MB ...... Marker beacon
Mn. •...•• Megohm
MEG •.... Meg (10) 6
MET ••... Metalized
MET FLM Metal Film
MET OX.. Metall i c oxide
MF . . . ... Medium frequency
MFH ..... Manufacturer
Mg .. , .... Milligram
MHz ..... Megahertz
MH ...... Millihenry
mho ...... mho
MIN ...... Minimum
mm ..... , Millimeter
MN L .. . .. Monolythi c
MOD ...•. Modified
MOS ..... Metal-oxide semiconductor
MS ...... Microsecond
MTG ..... Mounting
MTH ..... Meter
MV ....... Millivolt
MVAC .... Millivolt, AC
MVDC ••.. Millivolt, DC
MVP ..... Millivolt, peal\:
MVP-P ... Millivolt, peak-peal\:
MVrrns ... Millivolts, rms
MW ...... Milliwatt
My •....•. Mylar
J.L A •.•••. Microampere
11 F ..... .. Microfarad
11 H....... Microhenry
11 mho .... Mi cromho
/.Ls ••••••• MicrosEcond
/.l V...•... Microvolt
J.LVAC •••• Microvolt, AC
u VDC .... Microvolt, DC
NE •..••.• Neon
TA •..•. "
TB •••••••
TC •••.•.•
TERM. • .•
TGL ••...
TI •••.•..
TRIM •.••
TSTR ••.•
TTL .••.•
TV •••••••
NEG ..•..
NF .. , ....
NI PL .•..
N/O ••••••
NORM. • ••
UHF .••..• Ultrahigh frequency
UJT •••.•• Unijilllction transistor
uVPK .•.•
uVP-P .••
Vrms .•.
U W •...•.
.u
Microvolt, peak
Microvolt, peak-to-peak
Microvolt, rms
Microwatt
NA .••.•• Nanoarnpere
NCo ••.••• No cOlUlection
N/C ....•. Normally closed
Negative
Nanofarad
Nickel plate
Normally open
Normal
Tantalum
Tubular
Temperature compensating
Terminal
Toggle
Titanium
Trimmer
Transistor
Transistor - Transistor Logic
Typical Value
NRFR •••• Not recommended
for field replacement
NS .•••••• Nanosecond
NW••••• ,. Nanowatt
OBD ••••• Order by description
OD .•..... Outside diameter
OPAMP ... Operational amplifier
asc ...... Oscillator
OX .•...•. Oxide
oz ..•.... Ounce
.n. •••••••• Ohm
PC ••..•.•
PN .....••
POLYS .•.
P_P ..•..•
Pf .•..•..
Ps .......
Printed circuit
Part number
Polystyrene
Peak-to-peak
Picofarad
Picosecond
n ..... '~ '..
REe ... '.,"
REG .•....
RES ..•..•
RF •••••••
rms ., ~ •••
Rom •• , ••
RWV •••••
Resistor
Rectifier
Regulator
Resistor
Radio frequency
Root-mean-square
Read-out memory
Reverse working voltage
S ...•.... Second
S-B ...... Slow-blow
sen ...... Silicon controI1ed rectifier
SE .. , .... Selenium
SEMICON. Semiconductor
SH .... , .. Switch high speed
SI .•...•. Silicon
SIC ..•... Silver
SIG ••••••• Signal
SL ....... Slide
SNR •.•••• Signal-to-noise ratio
SDTD ••••• Single-pole douhler-throw
SPST •• '" Single-pole single-throw
SSB •••••• Single side band
SWR ••• ••• Standing wave ratio
SWT.
Switch
,0 •
•
••
V ........ Volt
VA .•••••• Voltampere
VAR .•.••• Variable
veo ...... Voltage - controlled oscillator
VDC ...... Volt DC
VHF •••••• Very-high frequencies
VRMS ••.• Volts, rms
VRT ••.•• Varactor
VSWR ..•. Voltage standing wave ratio
W ........ Watt
WVDC •••• Working volts DC
WW •• '.' •• Wire wound
z ......•. Characteristic impedance
ZEN ..... Zener
'ZV ••••••• Zener voltage
MULTIPLIERS
Abbreviation
T
G
M
k
da
d
c
m
u
n
p
f
a
Prefix
tern
giga
mega
kilo
deka
deci
centi
milli
micro
nano
pico
fernte
ntto
Multiple
10 12
10 9
10 6
10 3
10
10-1
10- 2
10-3
10- 6
10- 9
10-12
10-15
10-18
CODE LIST OF MANUFACTURERS
I
A-B
AER
A-H
AHH
ALF
ALN
APL
ATC
AUG
••••
••••
••••
••••
••••
•.••
A]]~n-BradleYI Electronics Division, Milwaulcee, Wisconsin 53204
Aerovox Corp .• New Bedford, Massachusetts 02741
Amp Hexseal Corp •• 44 Honeck St., Englewood, New Jersey 07631
Arrow Hart & Hegeman Inc •• 103 Hawthorn St •• Hartford, Connecticut 06106
Alpha Wire Corp., 711 Lidgerwood Ave., Elizabeth, New Jersey 07207
Allen Manufactor Co., Drawer 570, Hartford. Connecticut 06101
Amphenal Controls Division, 120 S. Main Street, Janesville, Wisconsin 53545
American Teclmical Ceramics, 1 Norden Lune, Huntington station, New York 11746
Augat Inc., 34 Perry Ave •• Attleboro, Massachusetts 02741
BAR·· ..
BEI( ....
BEL ....
BrR
"
BOS
"
BOU •...
BUI( ....
BUR ., ..
BUS
Barnes Corp., Lansdowne, Pennsylvania 19050
Beckman Instruments, 2500 Harbor Blvd., Fullerton, California 92634
Belden Corp., Dept. G, P.O. Box 1100, Richmond, Indiana 47374
Birtcher Corp., 4371 Valley Blvd., LOB Angeles, California 90032
Boston Gr'ar, 14 Hayward St., Quincy, Massachusetts 02171
Bourns Inc., 1200 Columbia Ave., Riverside, California 92507
Buckeye Stamping Co., 555 Marion Rd. t Columbus, Ohio 43207
Burndy Corp., Richards Ave., Norwalk, Connecticut 06856
Bussman Mfg., Jefferson St., St. Louis, Missouri 63107
C-I(
CAM ••.•
CAN ••••
CDjl •.••
CEP ••••
CIN ' " .
CRA ..•.
CRL ..••
CTC .•.•
CTS ....
C & K Components Inc., 103 Morse St., Watertown, Massachusetts 02172
Cam-Lok Div., Empire Products Inc., 10540 Chester Rd., CinCinnati, Ohio 45215
ITT - Cannon Electric, 666 E. Dyer Rd., santa Ana, California 92702
Cornell Dubilier Electric, 150 Avenue L, Newark, New Jersey 07101
Cherry Electrical Products Corp., 3600 Sunset, Waukegan, IllinOis 60085
TRW Cinch Div. 1500 Morse Ave., Elk Grove VIllage, Illinois 60007
Cramer Call Co., 1121 15th Ave., Grafton, Wisconsin 53024
Centralab Electronics Di\,., Globe-Union Inc., 5757 N. Green Bay Ave., Milwaukee, Wisconsin 53201
Cambridge Thermionic, 445 Concord Ave. t Cambridge, Massachusetts 02138
CTS Corp., 900 NW Blvd., Elimart, IndIana 46514
..
..
I
DAL •••• Dale Electronics, 1376 28th Ave., Columbus, Nebraska 68601
McGraw - Edison Co. - Daven Div., Grenier Field. Manchester, New Hampshire 03103
DAV
DIG " " Digitran Co., 855 S. Arroyo Pkwy, Pasadena, Callfornia 91105
EMC ••.•
EMI
ESW •...
ETP ••••
EVR ••••
....
Electronic Molding Corp., 96 Mill St., Woonsocket, Rhode Island 02895
Electro Mechanical Instrument Corp., 8 & Chestnut St., Perkasie, Pennsylvania 18944
Amerace Esna Corp - Elastic Stop Nut Dlv., 2330 Va\.lXhalI Rd., Union, New Jersey 07083
Erie Teolmological Products, 644 W. 12th St., Erie, Pennsylvania 16512
Union Carbide - Battery Product Div •• 270 Park Avenue, New York, New York 10017
. '"
Fairchild Semiconductor, 464 Ellis ct., Mountain View, California 94042
FER ..•. Ferroxcube Corp., Mt. Marion Rd .• Saugerties, New York 12477
F-S
General Cement Electronics, Rockford, Illinois 61101
G-C
General Electric - Semiconductor Products. Electronics Park, Syracuse, New Yorlc 13201
G-E
G rny~ill, 5G5 Hillgrove Ave., La Grange, Illinois 60525
G-H
General RadiO. 300 Baker Ave., Concord, Massachusetts 01742
G-R
GLD •••• Gould - Burgess Div., P.O. Box 3140. St. Paul. Minnesota 55165
GPC .••• Grove-Pin Corp., 1125 Hendricks Causeway, Ridgefield, New Jersey 07657
H-P .... Hewlett-Packard, 1501 Page Mill Rd., Palo Alto, California 94304
HAN ..•. Hanson Mfrg. Co .• Div. P R Mallory & Co .• P.O. Box 23, Princeton, Indiana 47670
HIE ., .. Heinemann Electric Co., Ri I, Trenton, New Jersey 08638
HOy •.•. Hoyt Electrical Instrument Work Inc., 556 Trapelo Rd., Belmont, Massachusetts 02179
I-S
lEI-!
IEB
IRC
Instruments Specialties, 280 Bergen Blvd., Little Falls, New Jersey 07424
Industrial Electronic Hardware Corp., 109 Prince St., New York, New York 10012
International Electronic Research Corp., 135 W. Magnolia, Burbank, California 91502
TRW - rRC Resistors, 401 W. Broad, 11th Floor, Philadelphia, Pennsylvania 19108
JBT
JBT Instruments Inc., 424 Chapel St., New Haven Connecticut 06508
JON .•.• Johason Mfg., 400 Rockaway Valley, Boonton, New Jersey 07005
KEy •... Keystone Electronics Corp., 423 Broome 81., New York, New York 10013
LEE ...• Leecraft Manufacturing Co •• Inc. 21-16 44 Rd., Long Island City, New York 11101
LIT •.•. Littlefuse Inc., 800 E. Northwest Hwy., Des Plaines, Illinois 60016
MAL •••• Mallory, P R & Co. Inc.
MEA ••••
MET .••.
MLN •..•
MLR •.••
MPC •..•
MRC .•.•
MOT ..••
- Mallory Battery, Broadway, Tarrytown, New Yorl{ 10591
- Mallory Controls, P.O. Box 327, Frankort, Indiana 46041
- Mallory Capacitor Co., E. Washington St., Indianapolis, Indiana 46206
Measurement - Systems, 523 West Ave., Norwalk, Cormecticut 06850
Metex Corp .• 970 New Durham Rd., Edison, New Jersey 08817
James Millen Mfg. Co. Inc. , 150 Exchange St., Malden, M;:tssachusetts 02148
J W Miller, 5917 S. Main St., Los Angeles, California 90014
Mepo/Electra Inc., Columbia Rd., Morristown, New Jersey 07960
Minor Rubber, 151 Ackerman St., Bloomfield, New Jersey 07003
Motorola Semiconductor Product Inc. E. McDowell Rd., Phoenix, Arizona 85008
I
N-S .•.. National Semiconductor Corp., 2900 Semiconductor Dr., Santa Clara, California 95051
NOB .... Griffith Plastic Product - Nobex Div., 1027 California Dr., Burlingame, California 94010
NTT ..•• National Tel-Tronics, Meadville, Pennsylvania 16335
OAK ...• Oak Industries rnc., Switch Div., Crystal Lake, Illinois 60014
OET .•.• OeUI;;er Inc., 71 Olmer Parkway, Livingston, New Jersey 07039
PAL ....
PAN .••.
PEM •...
PEN ••..
PZO ••.•
The Palnut Company, Glen Rd., Mountainside, New Jersey 07092
Panob Corp., 18 Merritt, Port Chester, New York 10573
Tech Ceramic Div. Penn Engineering Mfg. Corp., 1295 NW 163 st., Miami, Florida 33169
Penn Resistor Corp., 526 N .. Broad S1. Lansdale, Pennsylvania 19446
Piezo Crystal Co., 100 K St., Carlisle, Pennsylvania 17013
QC!
Quality Components Inc., Bridge & Railraod 8ts., St. Marys, Pennsylvania 15857
R-F
Robert Shaw Control Co. - Fulton Sylphon Div., P. O. Box 400, Knoxville, Tennessee 37901
RCA • ••• RCA- Solid State Div., Box 3200, SomervllIe, New Jersey 08876
RCL
REP
ROL
ROT
••.•
•...
•.•.
•.•.
RCL Electronics Inc., 700 S. 21st St., Irvington. New Jersey 07111
Republic Electronics, 176 E. 7th St., Paterson, New Jersey 07524
Standard Press Steel - Rollpin Div., Benson East, Jenkintown, Pennsylvania 19046
Rotron Inc., 7-9 Hasbroucl;; Ln., Woodstock, New York 12498
SAN •••• Sangamo Electric Co., Capacitor Div., P. O. Box, 128 Pickens,South Carolina 29671
SCI •.•. Switchcraft Inc., 5555 N. Elston Ave., Chicago, Illinois 60630
Selectro Corp. Mamaroneck, New York 10543
SEL
Illinois Tool Works Inc., Shalceproof Div., St. Charles Rd., Elgin, Illinois 60120
SHA
Sprague Electric Co .• 645 Marshall 8t., N. Adams, Massachusetts 01247
SPR
Spectral ElectroniCS Corp., 17070 E. Gale Avenue, City of Industry, California 91745
SPT
E. Stanwyck Coil Co. Inc., 75 Carson Ave .• Newburgh, New York 12550
STA
Superior Electric Co., 3000 Middle 8t. , Briston, Connecticut 06010
SUP
Texas Instruments Inc., P. O. Box 5012, Mail station 84, Dallas, Texas 75222
T-!
T-S
Wagner Electrical Corp., Tung Sol Div., 630 Pleastent Ave., Livingston, New Jersey 07039
TEX .•.. Texsc:m Corp., 2446 N. Shadeland Ave., Indianapolis, Indiana 46219
TIC •••• Tel-Instrument Electronics Corp., 728 Garden St., Carlstadt, New Jersey 07072
TNN ••.• Technical Nameplate Corp., 911st St., Passaic, New Jersey 07055
TRP •... Triplett Corp., 286 Harmon Rd., Bluffton, Ohio 45817
TRW .••• TRW, 061 Glenn Ave., Wheeling, Illinois 60090
VAR .... Val'o Semiconductor Inc., 2800 W. Kingsley Ave., Garland. Texas 75040
VEM .••• Vemaline Products Co., 455 W. Main St.. WyclmfI, New Jersey 07481
W-I( .•.•
W-L .•.•
WAK .••.
WES ...•
WOR •...
Waldes Kohinoor Inc. (Truarc) 47 - 16 Austel PI., Long Island City, Ne\v York 11101
Ward Leonard Electric Co. Inc., 32 South St., Mt. Vernon, New York 10550
WaItefield Engineering Inc. , 777 Audubon Rd •• Wakefield, Massachusetts 01880
Weston Instruments, 614 Frelinghuysen, Newark, New Jersey 07114
Wprlunan Electrical Products Inc •• 75 Packinghouse Rd., Sarasota, Florida 33578
ZER •••• Zero Manufacturing Co .• 777 Front St •• Burbank, California 91503
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