BC-659A_J_repair_instructions_TM11
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WA R
DEPARTMENT
TECHNICAL
MANUAL
RADIO RECEIVER
.
AND TRANSMITTERS
.,. .
.
BC-659-A, -B, -H, AND -J
REP AIR
n
INS1~RUCTIONS
STRICTED MATTER.
MINATION OF RE. rode or position
DISSEo\e\Y by virtu~ of hts ~ter . . such ~a~er
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is entrus e k ow\ edge or pos March '944.1
require such ;3b, /J>,R 3So-5, 'S
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•
WAR
DEPARTMENT
•
JUNE
1945
WAR
. DEPARTMENT
TM
TECHNICAL
1'\1ANUAL
I
11-4,023
RADIO RECEIVER.
AND TRANSMITTERS
'
BC-659-A, -B, -I-I, AND
-J
REPAIR INSTRUCTIONS
\
Clt.S:/,.,:,.,1 ~' C ., :c: t lED
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AUTHOP. I Y OF
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B;ii•lll:_.--1·1!·!'!.~. : . 1{/SSEMINAT/ON
•
OF R "
JUNE
MATTER.
No person is entitled solely by virtue of his grade or position to knowledge ..>r possession of classified matter. Such matter is entrusted only to
those individuals whose official duties require such knowledge or possession.
(See also paragraph 23b, AR 380-5, 15 March 1944.)
U11ited States Govem t(IC1ZI Pri11ting Office
W aslz itzgto 11: .7945
19 4 5
WAR DEPARTMENT
Washington 25, D. C., 22 June 1945
TM 11-4023, Radio Receiver and Transmitters BC- 659-A, -B, -H, and - J, Repair Instructions, is published for the information and guidance of all concemed.
[AG 300.7 (31 May 45)]
BY ORDER OF THE SECRETARY OF WAR:
G. C. MARSHALL
OFFICIAL:
Chief of Staff
J. A. ULIO
Major General
The Adjutcmt General
DISTRIBUTION:
AAF (5); AGF (5); ASF (2); T of Opn (5); Dept (5); Base Cornel (5); Island Comd
(5); Def Comd (2); Arm & Sv Bd (1); S Div ASF (1); Tech Sv (2); PC&S (1); PE (2) ...
Dep 11 (2); Gen Oversea SOS Dep (2) ; Pro Dist 11 (2) ; Gen & Sp Sv Sch (5); USM:A
(10); WDGS Lib (5); Lab 11 (2); Rep Shop 11 (2); A (5); CHQ (2). Three copies eac
to the following T/ 0 & E's: 11-7; 11- 15; 11-47; 11- 107; 11- 127; 11- 147; 11-587; 11-592 ;'
11-597.
Refer to FM 21-6 for explanation of distribution formula.
', ,
II
CONTENTS
Paragrnf!lt
SECTI ON I.
General ........................ . .. ...................................... , •... . ...
Over-all system function . . .. . ................................ . ................... .
II.
1
2
1
3
4
G
5
6
7
8
7
9
10
12
11
11
11
11
Presetting ........................ . .... . ... . . . .. ..... . . .. . .. . .. ... .......... .. .. . 13
Alignment incli cato 1· ...... . ............ . ..... . . .. . . . ............. . ....... .. .. . .... . 14
Presetting procedm·e usin g alignment indicator . . .... . ... . . . .. . ....... . . . ...... . . .... . 15
I-f and discriminator a lign ment .... . ...... . .. . ... . .. ........... . ... ..... ........... . 16
Neutralization .................... .... ............. .. ...... . . ......... ....• ...• ..• 17
1?
15
15
16
17
VI.
DETAILED TROUBLE-SHOOTING PROCE DURES.
18
19
20
19
22
23
21
22
23
24
25
26
27
28
29
2[i
25
25
2!5
25
26
26
26
26
30
31
32
33
34
35
36
37
38
39
40
41
42
43
28
28
30
32
34
36
38
40
42
46
48
50
r-2
54
FINAL TESTING.
A li gnment check . ... ... ...... .... . ........ .. .. . ............ ... .... .. ..... .. .. .. .. .
I-f selectivity test .. ................. . ....... .. ...... . .. .. .... .. ............. . . . .. .
I-f rejection ratio test .............. . . . .. .. .......... . ........... ................. .
D-e ampli fier gain test ................. .. . . . ............. . ....................... .
Image rejection ratio test . . .. . .. . . . ................. . .... . ...... . ..... .. ..... . . . .. .
Receiver sensitivity test ..... . .............................. .... .................. .
Audio-frequency response t st .... ...... . .................. . . . .................... .
T ran fim i tter power output ........................... . .. .. ..... . ............ . ..... .
Tran smitteL· neutralization ... . ...... . .. ... ..... ... . ... ....... .. . .... .. . . . . . . . . .... .
VIII.
11
ALIGNMENT PROCEDURE.
Signal substitution ................ . ... .......................... .... ............ .
Normal point-to-point r es istance values .................. . ......................... .
Moistureproofi ng·, fungiproofing, and refinishing .......... . ....................... . . .
VII.
7
8
9
PRELIMINARY TROUBLE-SHOOTING PROCEDURES.
General ....... . ........ . ............ .. . ... .. . · .. · .. · · · ·· · · · · · · · · · · · · · · · · · · · .. . · .. .
Returning chass is to hou sing .... . ..... .. ....... . . ................................. .
Input resistance check ........... ...... .. ... ........................ . . .. .......... .
Operational test . . ........... . . . . .. . ... ....... ... ........... .. . ..... .. . .. . .. ... .. .
V.
6
INITIAL REPA IR PROCEDURES.
General . ... . . . .. . ............. . . ... . . ................................ . .......... .
Tools, test and clea ning eq uipment . . .. ... . . . ............................... . . .. .... .
Disass mbly for inspecting and cleaning .. . ............................... . .... ..... .
Cleaning and inspecting of chassis . . ... . ............ . .. .. .. ........ ...... .......... .
IV.
a
DIFFERENCES BETWEEN MODELS.
Operat ional differences ... . . . ... ..... .. ........................................... .
Design differences ...... . . . .. .. ..................... .. .................... .. ..... .
Ill.
Page
DESCRIPTION OF RAD IO RECEIVER AND TRANSMITTERS BC-659-A, -B, - H, AND -J.
INDIVIDUAL STAGE AND CIRCUIT REPAIR DATA.
Filament circuit . . . . ....... . ................... . .................. ..... .... .... .. .
Receiver r-E amplifi er No. 1 . .. .................. . ... . .......................... . .. .
R-f amplifier No. 2 ........... . ....... . ..... . .. . . .... .. ... . ... . ... . ..... . . . . . .... .
Receiver mixer stage ........................................................... . . .
Receiver crystal oscill ator stage .... . ........... . .............. . ....... ..... ....... .
Receiver i-f amplifier No. 1 ................ ... ..... . .. .. . . ................... .. . . . . .
Receiver i-f amplifier No. 2 ............... . . .............. . .................. .. .... .
Receiver lim iter stage .. . . .. ....... . .... . ... . ........... . ...... . ... ............... .
Receive r diode rectifier and d-e ampl if1er discriminator ...... . ... . .... . .... ....... .... .
Receiver audio-frequency power amplifier ... ................ . ........ . . .. ........ . . .
Tra nsmitter r eactance modulator ........... ... .............. .. ......... . ......... .
Transmitter osci llator .... . ................. .... ... . ... . .............. ... ...... . .. .
Transmitter buffer ... . ................ . ..... ... ... .... ... ....... . . · .............. .
Transmitter r-f power amplifier ..... .. ............................. ·.. ... .. . ... .. . .
Ill
i
I
RESTRICTED
SECTION I
DESCRIPTION OF RADIO RECEIVER AND TRANSMITTERS
BC-659-A, -B , -H, AND -J*
I. General
c~.
UsE. Radio Receiver and Transmitter BC659- (*) is designed for short-range two-way
voice communication. It is a low power, port*See TM 11- 61 5 for install ati on , operation, and other
maintenance data on this equipment.
able, frequency-modulated radio receiver and
transmitter.
b. RANGE. The set is designed to operate over
distances up to 5 miles. The maximum range
will be greater when operating from an elevated position.
F·igu?'e 1. Radio R eceivm· and Tmnsntitte1· BC-659-( * ) .
...
~
I
I
4
by the antenna, and resonated in the poweramplifier (p-a) plate tank · circuit. It is impressed on the control grid of first r-f amplifier tube VT-179 (V5) . It is further amplified
by second r -f amplifier tube VT-179 (V6).'The
resulting voltage is impressed on the control
grid of mixer tube VT-178 (V7) . Crystal-controlled local oscillator Tube VT-185 (V8),
operates on the fourth harmonic to produce
the i-f beat. Two stages of i-f amplification are
inGluded, using tubes VT-179 (V9) and VT179 (V10). The arvplified i-f signal" is impressed on the -grid of limiter tube VT-179
(Vll) . This stage ·eliminates the amplitude
variations present in the signal, and feeds the
signal into tube VT-177 (V13) and VT-183
(V12) in a conventional discriminator circuit.
The triode portion of tube VT- 177 (V13) is
used as a d-e amplifier. The resulting audio
signal is fed into output tube VT-185 (V14) .
For use of d-e amplifier (V13) see c below.
c. TRANSMITTER. (1) The transmitter consists of a reactance modulator, tube VT-185
(V 4), an electron-coupl ed oscillator, tube VT185 (V3), a transmitter buffer-doubler, tube
VT-182 (V2), and an r-f, p-a tube VT-182
(V1).
(2) The oscillator is designed for good stability over a wide temperature range. It uses an
LC circuit in conjunction with the reactance
tube to control its frequency. A portion .of the
transmitter signal is feel back into the receiver
and since the r eceiver is crystal controlled, the
transmitter frequency is made to follow any
frequency change that appears at the receiver
input. The bias produced by the d-e amplifier
tends to hold the transmitter frequency constant.
( 3.) The doubler input circuit is tuned to
twice the oscillator frequency and therefore
amplifies the second harmonic. · The output
tuned circuit is tuned to twice the amplified
signal or four times the oscillator frequency.
The resulting voltage is amplified by the r-f
power amplifier and passed to the antenna.
I
I
SECTION II
DIFFERENCES BETWEEN MODELS
3. Operational Differences
There are no operational differences in the models of BC-659- ( *).
F·igm·e 4. F1'o.nt Panel, Radio Rece·ive1· ancl Tmnsmitter BC-;659-(* ) .
5
b
4. Design Differences
a. In Radio Receiver and Transmitter BC659 manufactured on Orders No. 16130-Phila44 and 16129-Phila-44, capacitor C72 has
been replaced by capacitor C76, 0.03 microfarad (mf), 400 volts direct current. · The output transformer has been changed to provide
an extra impedance matching tap to accommodate a 250-ohm load in addition to the 4,000ohm load. A label located on the outside chassis
wall indicates the manner in which the change
of impedance should :be made. A reversible
metal tag is mounted near the phone jack to
indicate the impedance connection. All impedance changes should be accompanied by a
corresponding reversal of tag.
b. All Radio Receiver and Transmitters BG659-A, -B, and -H are to be modified by the
addition of a loudspeaker cover (6C18) in accordance with MWO SIG 11-615-3. All other
models of BC-659 will be equipped with the
above-mentioned cover.
c. All Radio Receiver and Transmitters BC659-A, -B, and -H are to be modified to .incorporate Adapter M-399 in order to permit use
of the meter and the receiver amplifier, .tube
of the set for alignment procedure. The BC659-J will be equipped with Adapter M-399 by
the manufacturer.
I
I
SECTION Ill
INITIAL REPAIR PROCEDURES
6. Tools, Test and Cleaning Equipment
5. General
.
The following items should be available for repair of this set.
Note. Before making any repairs or any adjustments,
all authorized Modification Work Orders should be applied. See FM 21-6 for list of applicable Modification
Work Orders.
Table II
Item
Maintenance personnel should follow the procedure outlined in this manual when repairing
and overhauling Radio Receiver and Transmitter BC-659- ( *). The repair information in
this and the following sections is presented in
the order in which the repairman should actually perform the various operations in the repair shop. This procedure permits repair of the
equipment in the shortest time possible, r esulting in sensitivity and selectivity comparable to
that of new equipment.
Description
Assorted hand tools.
Insulated a lignment tool
(provided with equipment).
Soldering iron and solder.
R-f s·igna l Generato1•.... .
.C overing the range 4.0 me
to 40.0 me.
A-f signal Generator . .. . . . Covering the ·range 250 cps
to 3000 cps.
Alignment Equipment
ME-73-('' ).
Maintenance Equipment
ME-13-C:') .
1
Solvent, Dry-cleaning . ... . Approved symbol ( SD).
Assorted brushes.
Pipe cleaners.
Clean cloths ..... . ...... . Lint-free.
Sandpaper .... ... . ..... . #0000.
Crocus cloth.
Figure 5. Removing chassis /?·om housing, Ra.dio Receive?· and Tt·ansmitte?· BC-659-(*).
7
\
7. Disassembly for Inspecting and Cleaning
a. CHASSIS. Remove the chassis from the
housing by opening the tension clamps on either
side of the operating panel. The radio receiver
transmitter can then be slid out from the housing.
u. DESICCATOR. Remove desiccator by r emoving the four binderh ead screws holding the perforated desiccator fram e.
c. CRYSTAL REMOVAL. R emove both crystals
from the chassis by lifting the crystal retaining
spring.
/
Fig1.we 0. Desicoatm·JJosition in Radio Receive?' ancl Tmnsmittel' BC- 050-(*) .
t
d. REMOVAL OF TUBES. The r emoval of the
lock-in type of tubes as supplied with the set requires a special techn!que to prevent possibl e
crushing of tube and injury to the h ands. To
remove, grasp tube fi r·ml y, rock it back and
forth in the direction of the tube socket mounting screws and pull up'w ard.
e. INTERNAL BATTERY REMOVAL. The battery
box is located pn the transmitter side of the
radio r eceiver ~tnd tra nsmitter chassis and behind the front control panel. Th e cover plate is
held in place by four binderhead screws, two on
the top and two on th e left s ide. The removal of
the battery will necessitate the 1·emoval of the
four screws.
8. Cleaning and Inspecting of Chassis
a. CLEANING OF MAIN CHASSIS. Chassis must
be clean and free from rust and corrosion. Blow
Pium·e 7. Removctl of inwrwtl baU c?·y uf Radio
R eceive?· a11d 1'ruus mi tter B C-ii50- ( *).
9
spected to determine if the speaker shield has
been installed in accordance with MWO SIG 11615-3. It should be actuated by the lever to determine whether or not the shutter is free.
Figw· e 8. Antenna cottpling, Radio Receive1· cmd
Tmnsmitte1· BC-659-(*).
out all dust and dirt using clean, dry compressed air. Use solvent applied with lintless
cloth, brushes or pipe cleaners.
Caution: Do not attempt to remove tarnish
from silver-plated switch contacts.
Remove rust and corrosion with a stiff brush
and solvent. Heavier rust and corrosion may be
removed by careful use of crocus cloth, solvent,
and com pressed air.
·b. INSPECTING MAIN CHASSIS. After cleaning
the set, inspect the chassis to determine the
exact model. Check to see that model has been
modified as required. During inspecti_on a careful check must be made for any ev.idence of
temporary field repairs. All electrical components must be free from obvious mechanical
and electrical defects when inspected visually.
.f.-ny par·t, the fc~ilu1·e of which was obviously
ca.u secl by an elect?·ical fault, must not be r·eplaced unt·il ci1·cuit is ch eckecl ancl ca~~se of failure is clet e1·m·inecl.
(1) Wir·ing. All soldered joints must present
a good mechanical and electrical connection.
Wiring insulation must not be worn or chafed.
INsulated tubing must not be torn or missing,
and bare wires must not be shorted to chassis
or other parts. The chassis must be clean and
free from corrosion.
(2) Housing. The housing must not have
cracks or breaks in the metal. It must be free
from corrosion. It must not be scratched, and
must have no outside unpainted areas.
(3) Spe(Lker· sh·ielcl. The set should be in(
I
/
Figu1·e .9. Spealcm· shield, Rculio Receive1·
ctncl T1·ansmitte1· BC-659-(*).
(4) Chassis str·aps. The chassis straps should
be inspected for rips in the fabric or general
signs of wear.
(5) Pa·i nting. The housing should b~ touched
up using olive drab wrinkle finish paint if
the housing presents a ·p oor appearance. If
scratches are deep or unpainted areas are large,
the entire assembly should be repainted with
olive drab.
·
(6) 12 99 tube socket check. Check all 1299
tube sockets for solder in socket pin No. 8. It is
to be noted that the 1299 tube contains only
seven pins, with No. 8 missing. The exception
to the above is the Raytheon type 1299, which
has all eight pins. Therefore, it is important,
from the standpoint of replacement, that the
· No. 8 socket pin be free of foreign material.
( 7) Antenna spring tension. Check antenna
spring tension. This spring will be fo und in the
back of the chassis mounted on an insulator.
This spring must make good contact with antenna coupling on set housing.
(8) I-f tmnsfo?·nw?· c~l'ignment scr·ews. The
alignment screws on the top and bottom of
transformers T2, T3, T4, and T5, should be
checked for t ightness.
(9) Variable capa.cito1· r·otor· locking nuts.
With a 5/ 16-inch Spintite wrench, or alignment
tool, tighten the locking nuts on all variable air
capacitors, and check to see that the rotor setting does not change. If this condition exists it
will be necessary to replace the capacitor. Unlock the nuts after this test.
10
(10) AUgnment-screw position. Check the
position of all alignment screws on transformers T3, T4, and T5. The position shall not be
such that the scr ew-dr iver slot is flush or almost
flush to the containing bushing. Note that there
are two positions of the aligning screw at which
it is possible to align the transfor mer. The correct position is the one in which the aligning
screw is extended the farthest.
(11) Leakage 1·esistance. With a high reactance ohmmeter, measure for leakage resistance
between panel and chassis. This resistance value
should be more than 10 megohms. If leakage
exists, check condition of insulating bushing
around jacks, and .other panel insulating bushings.
(12) Meter p1·otecting fuse F2. On some
models of the BC-659-( *), it will be found that
resistor R13, wire-wound, 100 ohms, 1 watt, is
substituted for fuse F2. It has been found that
the presence of resistor R13 is beneficial in regard to filtering of vibrator hash in the plate
voltage. In all sets substitute resistor R13 for
fuse F2. In no case should both resistor R13
and fuse F2 be installed in the same set.
(13) Panel nuts. It may be found in some
cases that the bushings under the nuts are too
thick to allow sufficient surface pressure between the nuts and the panel, in which case the
bushings should be replaced with thinner ones.
( 14) Coil shields. All coil shields should be
tight, as vvell as the shield under the chassis. It
is to be noted in particular that poor grounds at
these points are responsible for narrow bandwidth and nonlinearity in the i-f response.
( 15) R ed dots on trimmer capacitors. The
red dots on trimmer capacitors should be repainted when original paint is missing or defaced.
(16) S ho?'ted A and B ttimnw1·. With an
ohmmete1·, check for short circ uits across all A
and B h ·immer capacitors as each capacitor is
rotated through its entire range. It will be necessary to put channel selector switch in A position while checking B tl'immers and vice versa.
c. CLEANING AND INSPECTING REMOVED
PARTS. (1) C1·ystals. Inspect and clean the pins
of crystal units with dry-cleaning solvent (SD ),
applied with a brush. If the pins are bent or
broken replace the crystal unit with a new unit.
Remove any heavy corrosion by careful use of
crocus cloth. Wipe off the unit with a lint-free
cloth moistened with dry-cleaning solvent
(SD).
(2) Desiccator. The silica gel desiccator, inclosed in a spun glass bag, is used in this set as
an extra precaution to absorb any moisture. A
portion of this bag is coated with cobalt chloride to serve as an indicator of the moisture
content of the silica gel. A blue color indicates
a dry desiccator; a pink color indicates a moishlre-saturated desiccator r equiring regeneration.
(3) Tub es. Clean the pins of the tubes with
dry-cleaning solvent (SD) applied with a brush.
For heavier corrosion use crocus cloth applied
with care. Inspect the tubes for bent pins and
internal or external breaks. Shake the tubes to
detect loose pins and loose elements. Check the
t ubes on the tube tester, allowing sufficient time
for the t ubes to warm up. Tap the tubes gently
during test to detect loose or defective elements.
Check for shorts between the elements.
(4) Batte1·y BA-41 . Cl)eck the battery for ,
r ated voltages. If battery checks low it should
be discarded.
d. REPLACING REMOVED PARTS. Replace crystals, desiccator, tubes, and internal battery in
t he chassis and fasten them in place.
SECTION IV
PRELIMINARY TROUBLE-SHOOTING PROCEDURES
9. General
c~. CRYS'rALS AND TUBES. Choose and insert
the proper crystals for the desired operating
frequency. Insert one set of tubes as listed in
table III below.
Table Ill
Tube type
JAN
JAN
JAN
JAN
JAN
JAN
3B7 / 1291
3D6/ 1299
1LN5
1LN4
1R4/ 1294
1LC6
Quantity
VT-182
VT- 185
VT- 179
VT- 177
VT- 183
VT- 178
2
4
the equipment, thereby preventing damage to
the unit or its power supply. Check the resistance at the power and control cable plug and
compare with values shown below. If the readings indicated are incorrect see section VIII,
and correct the fault before proceeding. All
measurements are made between plug pins and
the chassis. Pins on the plug are identified by
letters.
5
Pin No.
1
1
1
A
B
c
D
b. REPLACING CRYSTAL UNITS IN CHASSIS.
Care must be taken to insure the proper placement of the two crystal units. Crystals should
be placed in holder with their metal plates facing out away from each other. When crystals
are in place, close the retaining spring.
E
F
G
H
Res istance to cha ssis
Open
Open
Open
Open
Open
1 megohm minimum (depends on current leakage through electrolytic capacitor C31).
Open
Continuity
12. Operational Test
Conneot the set to the power supply and turn
on by rotating the volume control clockwise. Inspect set for any signs of abnormal operation
such as smoking, arcing, crackling or burning.
If abnormal behavior is noted, turn off the set
immediately. See section VIII, and oorreot the
fau lt before proceeding. If all indications appear normal check the performance of the set
by communicating with another unit operating
on the same frequency.
I 0. Returning Chass,is to Housing
Return the chassis to the housing by sliding it
into the open end with the chassis riding on ~the
bakelite insulated track. Fasten the clamps
holding the chassis in place.
I I. Input Resistance Check
Trouble within the unit can often be detected
by checking the resistance at the power input
terminals of the set before applying power to
II
SECTION V
ALIGNMENT PROCEDURE ·.
d. METERING SOCKE'l'. A metering socket i
13. Presetting
provided
on the chassis of Uadio Receiver ancl
a. GENERAL. Radio Receiver and Transmitter
Transmitter
BC-659- ( * ) for connecting a me,
BC-659- ( *) is designed to operate on any freter at various points in t he circuit for align,
quency within the range of 27.0 to 39 megament and test. The pin jacJ(s on this socket ar~
cycles (me). The freq uency of the receiver is
numbered fl·om 1 to 8 and are connected to th~
crystal controlled for operation on any two of
various
parts of the circuit so that when th~
120 different channels, spaced 100 kc apart,
common
lead of an electl·onic voltmeter is con,
within ·this x;ange. An automatic frequency-connec.ted
to
the chassis of the set and a d-e prob~
trol bias voltage is generated in the receiver
of
the
elecb·onic
voltmeter is inserted into a pill
and applied to the reactance modu lator to conjack,
the
conesponding
voltage is read on th ~
trol the. frequency of the transmitter oscill ator.
electronic
voltmeter.
Sets, when iss ued,' are properly aligned and preset on the two channels marl<ed on the container. However, the P-A PLATE stage should
be realigned before operation. With ba·t teries
and crystals installed, and proper connections
made in accordance with procedures, the set
can be opemted on these two freq uencies. Check
to see tha<t the set operates properly before attempting to change the channel presettings.
b. TRIMMER SETTINGS. Before placing the set
in operation on any two assigned channels, it is
necessary first to have the proper crys·t al for
each a signed channel, and then to adjust properly the trimmer capacitors on the chassis to
the assigned channels. These trimmers are arranged in seven pairs, marked A1 (B1) to A7
(B7) on the chassis and are provided vvith dial
cards. Only these t?·imme1·s need to be cLdiusted
when p·t esetting channels. Do not distu1·b any
other acliust?nents.
.
C. CHANNEL MARKINGS. For convenience .i n --~'-~
dis·t inguishing between the controls for the two
channels, all of the controls for one channel are
labeled A, and all of the controls for t he other
are labeled B. The channel selector switch
marJ~ed CHAN, is on t he panel of the Radio
ReceiVer and Transmitter BC-659-(*). The
two positions in the crystal sockets on top of
Figtvre 10. Meterin[t sock et, Rc~clio Receive?· and
the chassis are labeled A and B.
·
Tran sn11tte?' B -(!5.9-( * ).
12
13
e. PIN JACK CONNECTIONS. The metering
socket pin jack connections are as follows:
Pin jacl<s
Meter indication
Pin jack No. 1
Pin jack No. 2
Pin jack
Pin jack
Pin
Pin
Pin
.P in
j ack
jack
jack
jack
Receiver •Oscillator grid voltage.
Receiver conve1·ter injection grid voltage.
No. 3 Receiver limiter grid voltage.
No . 4 Reactance modulator grid voltage (d-e
amplifier output) .
No. 5 Transmitter buffer grid voltage.
No. 6 Transmitter oscillator grid voltage.
No. 7 Receiver discriminator output voltage.
No. 8 Output of one discriminator diode
(VT-177).
f. TEST EQUIPMENT. The following items of
test equipment required to preset channels are
furnished in or issued with Maintenance Equipment ME-13-(*) and Alignment Equipment
ME-73.
( 1) An electronic voltmeter for measuring
voltages at .the metering sockets which may be:
(a) Voltohmmeter I-107-(*), part of Alignment Equipment ME-13-(*). See TM 11-306.
(b) The panel meter of the Radio Receiver
and Transmitter BC-659- ( *) in conjunction
with Adapter M-399.
(c) Any other electronic voltmeter such as
Hickok Model 202, R.C.A. Voltohmyst, etc.
(2) Alignment tool TL-150 or TL-207.
(3) Adapter RS-259.
( 4) Other tools such as hexagon socket
wrench, screw driver, etc.
g. PROCEDURE FOR SETTING TRIMMERS. In setting up equipment these steps can be followed
regardless of the type of electronic voltmeter
•
used.
( 1) Remove the chassis .of the radio receiver
and transmitter from its case by 1·emoving all
screws, or unfastening the catch clips around
the edge of the panel and pulling the chassis
forward.
(2) Set switches SW1 and SW2 at OFF. Set
panel meter switch at CHECK.
( 3) Insert the required crystals in the proper
channel sockets. The nameplates should face
outward, away from each other. Plug in the
handset.
(4) Set the locknuts on trimmers A1 (B1)
through A7 (B7) with Alignment Tool TL-207
until .the trimmer adjusting shafts are taut. Do
not tighten them so that t?·im?ne?· shafts .iam.
Do not tighten locknuts fu?·theT Chfte?· p?·esetting as fu1·the1· tightening tends to change the
adjustment and 1nc~y dam,age the capaciton.
(5) Set each trimmer to its approximate setting as shown in the following chart:
Table IV. Ap1J1'ox·i nw/.e i?·imme?· settings
Al
m
A3 B3
r-f
A~
B•l
!'CCV I" .
A2 D2
Channel
osc.
mixer
f!l' id
X mtr.
osc.
A5 B5
bufl'er
A6- B6
PA
270
280
290
300
310
320
330
340
350
360
370
380
389
0.0
0.6
1.4
2.2
2.9
3.6
4.0
4.1
4.6
4.9
5.4
5.6
5.8
1.0
1.9
2.4
3.0
3.6
4.1
4.2
4.6
5.0
5.2
5.5
5.6
5.8
0.8
1.4
2.0
2.4
3.1
3.8
4.2
4.5
4.7
4.8
".2
5.3
5.4
0.2
1.2
1.7
2.3
2.8
3.5
3.9
4.2
4.5
4.8
5.2
5.5
5.9
0.4
1.2
1.7
2.2
2.7
3.3
3.7
3.9
4.0
4.5
4.9
5.0
5.1
0.0
0.7
1.3
1.8
2.3
3.0
3.4
3.7
3.9
4.2
4.6
4.8
5.0
--- --
'
Noie . R ed dots on ihc i?·i:m??W?' s hafis indicate the side
of ihe slot that s hou.ld be toward t h e cl·ial card. 'Piw
wiclih of ihe s lot is a bou.t one-tenth of a division. I n case
the ?·ed dot has wont off, its 1J1·ope1· locati.on can be
found by fully ?neshinr; the capcwito?·. The end of the
slot nee~?· the 0 of the 0-6 scale is the end that s hould
ca?T1J the ?·eel clots.
Caut·i on: In adjusting the trimmers in the
following operations they need not be turned
very far from the approximate setting shown
in the chart. If it does appear necessary to turn
them far from these settings, it means that some
adjustment has been incorrectly made, or that
D7
PA
plate
A7
1.0
1.8
2.4
2.8
3.1
3.8
3.9
4.0
4.1
4.2
4.7
4.8
5.0
these capacitors are defective. Recheck your
previous steps and examine the capacitors for
misalignment of plates or breakage.
(6) Check the condition of Battery BA-41
by means of an electronic voltmeter by inserting the probe in pin jack No. 4 of the metering
socket. Replace the battery if the voltage is less
than 20 volts.
(7) Connect Radio Receiver and Transmitter
BC-659-('i') to its source of power by joining
the two halves of the power and control cable
.14
connector. If Case CS-79- ( *) is to be used, inone peak can be .found. Choose the
sert Adapter RS-259 (part of Maintenance
highest peak near the approximate
Equipment ME-13-(*) and Alignment Equipsetting and adjust A4 (B4) for
ment ME-73) bet·ween Battery BA-39 and its
maximum.
plug. Adapter RS-259 places a 500 ohm resistor
. Note. If difficulty is exper ienced in dist ingui shing the
in series with the high-voltage lead to protect
r1ght J?Cak, the first r-f amplifier tube may be :removed
jo?· th~s st ep only. This is tube VT- 17!) (V5).
the transmitter tubes while mal<ing adjust2 . Insert ,t he probe in pin jack No. 4 of
ments. If Plate Supply Unit PE-117-C is to be
metering socket, press microphone
used, the adapter is not necessary because of
switch, and note the reading on the
the voltage regulation characteristics of this
plate supply unit.
electronic voltmeter. Then very
( 8) Presetting procedure using Voltohmcarefully and lo wly make a slight
meter I-107- ( *) or other electronic voltmeters.
readjustment of A4 (B4) in the
(a) Set up and calibrate Voltohmmeter Idirection that brings the meter
reading to -6 volts. Listen in the
107-(*) as directed in TM 11-306. Connect the
handset while making this adjustcommon lead alligator clip to the chassis, not to
ment. If a rushing backgTotmd
the front panel, of Radio Receiver and Transnoi se comes up, A4 (B!J.) has been
mitter BC-659- ( *). The front panel, speaker,
etc., are insulated from the chassis and you canmoved too far. Go back to step 1
not use them as a return.
and get back on the conect peak
(b) Set panel meter switch at CHECK. Roagain. Check that it is now possible
tate volume control fully clockwise (right). Set
to hear your voice in the phones
CHAN switch at A or B, whichever is to be the
when speaking into the microlower frequency channel. Remember that ithe
phone.
lower frequency channel mu st be preset first.
3 . Insert the probe in pin jack No. 5 of
(c) The following steps preset the receiver.
metering socket, and tune A5 (B5)
Do not press the microphone switch.
for maximum meter reading.
1. To check crystal activity, insert the
4. Check to see that the panel meter
meter probe in pin jack No. 1 of
switch is at CHECK. The rc t of
metering socket. A meter reading
these adjustments will be made
of approximately -15 volts or
using the panel meter.
more indicates a good crystal.
5. Set switch SWI to ON. Tune A6 (B6)
2. Insert the probe in pin jack No.2 of
for maximum reading on the panel
metering socket and tune AI (or
meter.
Bl if channel B is to be set first)
6. Set switch SW2 to ON. Tum panel
for maximum meter reading.
meter switch to OPEIL Quickly
S. Tune A2 (B2) for maximum noise in
tunc A 7 (B7) for minirnurn on the
the handset.
panel meter.
4. Tune A3 (B3) for maximum noise in
Ccmtion : Do not press the microphone sw itch
the handset.
until you arc ready to make the adjustment
swiftly, as it is easy to ruin the p-a tube during
5. Tune A7 (B7) for maximum noise in
this adjustment.
the handset.
( e) The lower frequency channel is now comNote. I~1 steps 31 4, and. 5 it is recom~nended that th.e
pletely preset. Set switches SWl and SW2 at
probt;' be m serted m pm .Jack No. 8 of mete1·ing socket
and . ' ·· • the. meter b~ ol!lserved fo~· ~ slight peak at
O~F, panel meter at CHECK, and CHA
ma x1m-. ... no1se peak m order to obtam a fin e adjustswitch at the other channel. Preset this chanment. Use low range of meter for best sensitivity.
nel in the same manner, tuning the other set
(d) The fo llowing steps preset the transmitof trimmers.
ter. Press the microphone switch only while
(f) Check to see that switches SWl and
making adjustments. Switches SWl and SW2
SW2 arc ON, replace the set in its case, and
in OFF position.
.
connect the antenna that w ill be used. Recheck
1. Insert the probe in pin jack No. 3 of
~ 7 (B7) for minimum. There is a covered opcnmetering socket. Slowly tune A4
mg at the rear top of the case for this purpose.
(B4) about its approximate setThe panel meter should now read between 1.8
ting. You will see that more than
and 3 (OPEIL).
15
14. Alignment Indicator
The alignment indicator consists of the e::;sential components ·Of Adapter M-399. The alignment indicator switch is mounted on a bracket
on the end of the battery box. When the alignment indicator switch is at ALIGN, the receiver
amplifier stage of the set is converted into a
vacuum-tube voltmeter circui t, the meter on the
front panel being utilized as an indicator. This
makes possible the changing of channels as well
as complete alignment of the set without using
an external meter. When the alignment indicator sw itch is at OFF, t he alignment indicator
does not interfere with the normal use of the
set.
Figw;c 11 . Acla7Jt.e1· J\II-399 .
15. Presetting Procedure Using
Alignment Indicator
c&. Check the alignment indicator be~ore presetting. Set the OFF-ALIGN switch t6 ALIGN,
VOLUME control fu ll on, and note the panel
meter reading. Turn the VOLUME control all
the way back to the left f1·om fu ll on, and note
the change in the meter reading. If the change
is more than one d ivision, try other tubes VT185 in the receiver audio-frequency (a-f) p-a
socket until one is found that is satisfactory.
This tube should give a meter r eading between
1.5 and 2.5. Next t urn the volume control full
on. Note the meter read ing with the probe free
(held away from the set) ; then ground the
p1·obe to the chassis. If the meter reading does
not int:rease at least five divisions, check tube
VT-185 and Battery BA-40. Replace either or
both as necessary.
b. When the probe is not in use, place it in
the Fahnestock clip. This clip is located on the
bakelite strip held by the lower left speaker
mounting screw, when viewed from the rear.
c. Set the OFF-ALIGN switch at ALIGN. Set
switches SW1 and SW2 at the OFF positions.
Set the panel meter switch at CHECK. Rotate
the volume control fully clockwise and set the
CHAN switch at A orB, whichever is to be the
lower ·frequency channel. R em.e11ibe1· that the
loweT !1·equency channel is to be pl'eset fint.
The 1·eceiveT 1ntt,St be p1·eset befo1·e the tTansm.itter.
d. To preset the Teceive1·, proceed as follows:
In adjusting the trimmers in the following operations, do not press the microphone switch.
The trimmers need not be turned very far from
the approximate settings shown in the table. If
it is necessary to turn them far from these settings, some adj ustment has been incorrectly
made, or the capacitors are defective. Recheck
t he previous steps, and examine the capacitors
for breakage or misalignment of plates.
(1) Check crystal activity by inserting the
probe in pin j ack No. 1 of the metering socket.
With the volume control fully clockwise, the
meter reading should be approximately zero for
good crystals.
(2) Insert the probe in pin jack No. 2 of the
metering socket, and tune A1 (B1) for minimum on the ·meter.
(3) Tune A2 (B2) for maximum noise in the
handset.
( L1) Tune A3 ( B3) for maximum noise in the
handset.
(5) Tune A7 (B7) for maximum noise in the
handset.
(6) Repeat steps (3), (4), and (5).
Note. In order to obtain a fine adju stment in steps
_(3), (4) and_ (5J, it is recommended that the probe be
1nsertecl 111 pm Jack No. 8 of the metering socket. Observe t he meter for a slight dip at the maximum noise
peak. VOLUME control should be full on.
e. To preset the transmitter, proceed as follows:
( 1) Insert the probe in pin jack No. 3 of the
metering socket. Slowly tune A4 (B4) about its
approximate setting. More than one dip will be
found. Choose the dip that gives the 1nininmm.
reading on the meter and is still near the approximate settin )·.Tune A4 (B4) accurately fo1·
'
,
min/i;num in this dip.. .
'
· are ON, replace' the set in the case, and· t:u.l!l'U'='Mfi!,'J
the antenna to be used. Recheck A7 (B'O
move first r-f amplifier tu~e VT-179 (V5) for this step
mini~um.
There is a cover opening at the
o:fily~ . ·.
'
·
·,
top of ·the case for this purpose. The panel me. .
. ' (2) Calibrate the meter. Battery BA-41 .in
the set must be in good condition: Note the me- . ter should now read between 1.8 and
(OPER).
. tel' reading·with the probe ·held free. 'ThEm note
,
h. · The following alignment procedure use,s
t:p.e meter reading with the _probe ,.group.de<:l to'
Alignment
Equipment ME-73 and the alim-·
. tlie: chassis. Reduce the volume control setting
ment
indicator
which is built into Radio R~­
until '.the difference between .the two readings is
ceiver
and
Transmitter
BC-659-J.
'' ex~ctiy four, and one-half divisions. Do not disCheck
for
t
he'
proper
functioning o{
(1)
turb the volume control setting during the folalignment indicator as described in paragraph
: ., lo.wing operations.
· (3) 'P~ess . the microphone switch and note .15.
1
(2') IIJsert the 4.3-m~ crystal (part of
•·
, the ·reading With the probe held free. Insert the
73) in either crystal socket, and set the· v ... ,,....,,,,
· .J probe 'in pin jack N0. 4 of the metering socket.
SjWitch accordingly. Set the OFF-ALIGN swi
·.'" , Th~n veiy carefully and slowly make a slight
at ALIGN.
,readjustment of A4 (B4) ' in rthe direction that
(3) Rotate the VOLUME control of .......,,.uv•""'
brings the meter reading to exactly one division
Receiver and Transmitter BC-559-J fully ....v,•.n.-..
) ess than it was with the probe free. Listen in
wise (to the right).
·.'the receiver of the handset whil,e making this
(4) Insert the probe in pin jack No.3 of
'adjust~ent. If a rushing background noise is 1
ID:etering socket. Adjust the secondary
· ·:. heard, ~4 (B4) has been moved too far. Go
. · ··.back to e(l) above and 'tune for the correct dip · tom) and the primary (top) of the i-f T.r~.TI>!Oioo'l'
formers T4, T3, and T2 in that order for
c.. · again. Sp~ak into the microphone. If your voice
mum on the panel meter. If the meter goes
. , · can be heard Jn the :veceiver of the handset, this
. ·
zero., reduce the volume control setting.
'step ,has·' been ·made correctly.
." · . ( 4) Insert the probe in pin jack No. 5 of the
(5) ReadJust the primary and secondary
metering socket, . and tuRe A5 (B5) for miniT2, T3, and T4 in that order. The i-f amplifier
is now aligned.
·
' ·
.
mtpn on the meter. ,
, (5) Set .the OFF-ALIGN switch at OFF.
(6) Note the panel meter reading with
PJace the probe in the ·Fah~estock clfp on the ' probe grounded to the chassis (VOLUME
trol £ull :on). This is a zero voltage reading. ~
.speaker mounting screw. Make the rest of these
·adjustments, us1ng the panel meter in its nor- ·
'(7) Insert the probe in pin Jack No.7 of
rnai ·circu.its.
metering socket. Adjust the secondary of
criminator transformer T5 until the meter
( -(6) .S~~· switch ~Wl ~tON. Tune A6 (Bp)
for :qia;x:~.mum readmg on the. panel meter.
dication is the same as in ( 6) above.. , . ·
· :·· ..!·(1) Set switch ' SW2· at QN. Tarn the panel
( 8) Insert the probe in pin jack No. 8 of
: ril~fer switch to OPER.' Quickly ·tune A7 (B7)
metering so~ket. and adjust T5 primary .
fo( the minimum on thE! panel meter.
minimum on· the panel meter.
. . '' qaution: Do not pr-ess the microphone switch
(9) Check the secondary of T5 as
. ., uy.til the adjustmenfis ready to be made,.'as the
in subparagraph (7) above, and readjust
<.. P-a tube may be easily damaged during this ad- · volts if necessary. The discriminator
jastment.
" '
aligned.
.
'· \
Not'e. n· sh?uYd n~t be necessarY: to turn A7 (B7)
(10) Turn the set ~ff. Set OFF-=........ u .....
.mol'e than .. shghtlYc from . the settmg made in d(5) . switch at OFF, and remove 'the 4.3-tnc
·~~~ye, as A7 (B7) shoulq already b.e part way into the
lhp. , If the l!leter needle lS ' not _in the dip, A4 (B4) is
Place tl1e probe iri the Fahnestock Clip on
prop~b~y a4Justed tq ·~ false d1p. It will therefore be
SP,eaker
mounting screw. Replace the
· nec'essary ta go back" tO (1) above and ·start over .
'• f... The lower frequep.cy channel is now 'co~~ crystals in their· proper sockets, and check
presetting adjustment for both channels.
pletel,Y preset·. Set switch SW1 and SW2. to
the
set to· its case.
.: , OFF; panel meter switch at CHECK, aRd
~-' CHAN switch at the. other channel. :Preset the
(}hannel in the same manner tuning the other
16. l~f and Discriminator Alignment
,
~:J• II!#."··,·· '' . set of b.!immets.
,
· · ·
··
· a. In addition to the equipment mentioneq
. , , _IJ;, Make,.' sur.e that switches SW1 and SW2 paragraph 15, a means of generating a
,·
•
/
'r
. Note:.u ·it ~s , diffi.cu)t to disthiguish the right dip, re-
r
t·
'at the intermediate frequency ( 4.3 me) is required: Maintenance Equipment ME-13--:(*)
· ' i'nciudes Oscillator V0-4- ( *). Alignment
Equipment ME-73 includes a 4.3 me crystal
. that is used in the receiver oscillator circuit.
:- · b. Set up equipment and remove crystals
i'rfom the set. .
,
:c. The following alignment procedure using
. Mai;ntenance Equipment ME-13-( *) is based
' ·on the use of Voltohmmeter I-107-( *) as an
indicator. However, any other electronic volt,
meter will serve equally well.
·· ·. (1) Set up and · calibrate Voltohmmeter Illo'7-( *) as indicatea in TM 11- 306. Connect
the .common lead alligator ·clip. to the chassis of
·: Radio Receiver and Transmitter BC-659-( *).
< _.:· ·., (~·) Set up Oscillator V0-4-( *) as indicated
. '. ,· in-TM 11-306-and set its switch at 4.3 me. Turn
ATTENUATION control clockwise only enough
tb' tur n Oscillator V0-4- ( *) on.
primary for maximum on Voltohmmetet: .· 1-'
107-( *).
(9) Check the secondary of transformer ~T5
as in step (7) and readjust it to zero if neces-'
,
sary. The discriminator is now aligned'.
(10) Turn the set off; disconnect the test
equipment, and replace the crystals. Be sure
that the crystals are inserted in the proper
channel sockets. Check presettinsf adjustments
for both channels.
··,
.
.
I.
'.
.
17. Neutralization
a. GENERAL. Neutralization of the final p-a
stage should not be necessary unless the original setting of the neutralizing capacitors. has
been accidentally changed. Neutralizing capacitors C4 and C5 are accessible from the b'ottom
.of the chassis. Do not move them unless it actually becomes necessary to reneutralize the
final p-a stage.
b. To CHECK NEUTRALIZATION. (1) Remove
. Note. During the i-f alignment, reduce the output of
the osciliator whenever possible, by turning the ~tten­
t he set from the case. Turn the panel meter
uation control still further to the right. work with as
switch to CHECK. Set switch SW2 at OFF and
w.eak a signal as possib~e.
CHAN switch at A.
'I
, · , ( 3) Turn Radio Receiver and Transmitter
(2) Press the microphone switch and tune
A7 through its range, watching for a dip on the
BC-S59-( *) on by means of the volume control.
panel meter.
·. Do not connect.the microphqne.
(3) :Repeat ·steps (1) and (2) ' above for
4') Connect .the hot lead of the oscill:;~.tor to
channel
B.
'pin jack No. 4 of mixer tube V7 (VT-178).
(4) If the dip is more than one divis·ion, the
· '. (.5) : Insert the meter probe in pin jack No.3
..
· ·, of , the metering socket. Adjust the secondary ~stage. must be neutralized.
c. To NEUTRALIZE. ( 1) Set CHAN switch at
(bottom) and primary (top) of i-f transformthe
higher frequency channel.
·
.
er~!! T4, T3, and T2 in that order for maximum
(2) Adjust capacitor C4 and· C5 equally in
I on Voltohmmeter I-107-( *) .
small steps, checking between adjustments fo.r .
(6) Readjust the primary and secondary of
dip as in b (2) above until the dip is less tha;n
T2, T3, and T4 in that order. The i-f amplifier one division. Settings ·of C4 and C5 must be
is now aligned.
kept approximately ·equal. Check by observing
- ~ (7) Insert the probe in pin jack No. 7 of the
the mesh of the plates.
·
metering ·socket. Using the full output of Os(3) Check dip on the other channel. The
cillator V0-4- ( * ) and the lowest range of the
same adjustment of capacitors C4 and C5 must
.. '.: voltmeter, adjust the secondary of discrimina- . serve for both channels. ,
. tor transformer T5 for 0 volts.
d. SWITCH CHANGE. Set switch SW1 at ON
,.(8) Insert the probe in pin jack No. 8 of the
and the panel meter switch at OPER. Replac~
the set in its case.
·
. ~~tedng socket, and adjust transformer T5
I
.
I
.
(
.,
18
ANTENNA
CONTACTO R
P-A PLATE
0
~f¥1® &~~
INTERNAL BATTERY BOX
(U SE
BATTERY BA-4 1)
FRONT
P2
POWER S CONTROL
CONNECTOR PLuG
CABLE
Fi,g1we 12. 'l'o7J vi('w· uf c·Iw.sst.~
. . . , R nr l 111
' R.eccwer
.
nnd "1 1·~msmiiter llC-ri!i fi - ( * ).
T L 19012
SECTION VI
DETAILED TROUBLE-SHOOTING PROCEDURES
18. Signal Substitution
c~. GENERAL. lf the set is inoperative or has
weak output when aligned, the trouble may be
localized to a particular stage by signal tracing
or substitution. Such a system is outlined in
this section.
b. TEST EQUIPMENT. The following equipment is necessary: one a-f signal generator
(250-3,000 cycles per second (cps)) and an r-f
signal generator covering at least 3.0 to 40.0
me. Maintenance Equipment ME-13-(*) includes Oscillator V0-4- ( *) . This may be substituted for the r-f signal generator. Alignment
Equipment ME-73 includes a 4.3 me crystal
that is used for receiver oscill ator circuit. An
electronic voltmeter for measuring voltages at
the metering· socket which may be :
(1) Voltohmmeter l-107-(*) part of Main-
tenance Equipment ME-13-(*). (See TM 11306.)
(2) The panel meter of Radio Receiver and
Transmitter BC-659-( *) in conjunction with
adapter M-399.
( 3) Any other electronic voltmeter such as
Hickok Model 202, RCA Voltohmyst, etc.
c. PROCEDURE. With the aid of figure 13 and
table V, inj ect the signal wHhin a particular
stage. Apply the hot lead of the signal generator to the lug of the tube socket in accordance
with figure 13. A signal should be hea1·d in the
phone or read on an output meter. See table VI
for type of signal generator, frequency, and input voltage. After the trouble has been localized
to a particular stage make a resistance and voltage check of the individual components using
table VII to XX to locate the faulty part.
19
20
6
V1
VT -182
TRANS. R-F P-A
vr-179
9
RECEIVER R-F AMP. NO.I
Vz
V T - 162
.,.RANS. BUFFER
~----7
v7
VT-178
RECE IVER MIXER
V,z
VT- 163
RECEIVER DIODE RECT '
v.
1/T
· 16~
TRANS REACT MOD
METERING SOCKET
(SEE ALIGNMENT PROCEDURE
FOR VOLTAGE MEASUREtAENT S
AT THIS SOCKE 1)
DETAIL N0-63C36436
PANEL
NOTE- VOLTAGES MEA SUR ED IN. 'RECEIVE'
POSITION, EXCEPT WHERE NOTED . ALL
VOLTAGES MEASURED BETWEEN CHASS IS
AND SOCKET TERMINAL INDICATED; VALUES
ARE IN 0 C VOLTS
VOLUME CONTROL FULL ON.
METER SWITCH AT 'OPERATE'
CHANNEL SW IT CH 'A' OR 'B'
VOLTAGES SHOWN ARE OBTA IN.ED BY'
USING FRESH BATTERIES .
ALL VALUES SHOWN ARE NOMINAb.
VOLTAGES MEASURED WITH TUBE VOLTMETER
(RCA VOLT OHMYS T, STOCK N0-165),VOLTOHMMETER 1- 107-AoRB, OR EQUIVALENT.
*WITH ZERO DISCRIM INATOR VOLTS
t WITH TRAN S MITTER SWITCH ON
7V WITH TRANSM IT TER SWITCH OFF.
• WITH TRAN SMITTER SW ITCH OFF
• NO EXTERNAL CONNECT ION
6 NOT MEASURED.
I SOCKET TERMINAL USED AS TIE OR DUMMY
LUG ONLY. NO TUBE ELEMENT CONNECTS
TO THIS LUG
F'i,qnre 13. BottiYin view of chassis with step-by-step signal substittaion 1wor:echt1·e,
Ruclio R ece·ive 1· ancl 1'rurt.ii'/lt.ttie1· H(;-Ub!J-('·).
TL 19013
21
Table IX. 'f'ransntitte?' oscilla.to1· voltage and
1·eststance 1neasu1·ements (VS)
...___..
E
Element
l'in
@
@
A
@
•
0.
0
0
Resi stance
Volts
Fil . . . . . . . . . . . . .
'Plate
....
Screen . . . . . . . . .
..
..
..
Terminal . . . .
Control grid
Fil center tap . . .
Fil . . . . . . . . . . . .
1
2
3
4
5
6
7
8
.
+3.1 . .... . .
+89 . . .. . ..
+ 90 . . . . . .
. .. . . .
+ 00 . . . ..
......
. ..
. . . . . ..
0
0
Infinity .
Infinity.
Infinity .
Infinity.
Infmity .
Infinity .
Table X. Tnm smitte?· ?·eaciance moclulato1· voltag e and
1·es 1stance measm·ements ( V 1;)
Element
Pin
1
2
3
@
@
4
5
Figm·e 1SA. Pin v·iew of intental batte1·y box 7Jlug.
6
T able V . Condition jo1· signal substitution
. . Set placed upside clown, panel toSet
ward operator, case r emoved.
Battery conn,ected. Volume control
Power
panel ON.
.
Channel switch turned to e1ther A
Cha nnel .......
or B.
Set operating as r eceiver .
Recvr-Xmtr
Outside
shi eld o1· cable marked
r
.
.
Signal Generato
ground of outside cab le connected
to set chassis (not front panel).
Meter switch . . . Meter switch is turned to OPER.
8
•••••
0
0
•••
••
0
••
•
0
0.
•
-... Audio grid . . . . . .
... D-e aJnp. grid. . . .
diode . . .
... Recei ver
... Limiter grid . . . .
.... . .
... 2d i-ff aa mp
mn . . . . . .
... 1st i- · grid
......
.. Mixet
.....
.. . 2d r- ff grid.
.. • I 1st r- g r id . . . . . .
1
2
3
4
5
6
7
8
9
InpuL
Sign: d generatOI'
co nn ected to
Step
7
vo ltage
Frequency
J ,000 or 400 cps.
1,000 or 400 cps .
1,000 or 400 cps.
4.3 me .. . ... .. .
4.3 me ........ .
4.3 me ........ .
R-f fr equency* .
R-f frequency* .
R-f frequency* .
lv
lv
lv
. Olv
.Olv
.Olv
.OOlv
.OOlv
.OOlv
•R-I frequcn cy- o[ cha nn e l w;cd.
Element
P in
1
2
3
4
5
6
7
8
Res h;lan c<' •
Volts
E lement
1 megohm.
Infinity.
2,800
Infinity.
Infinity.
2,800
Grid 1 ... ...... .
+ 115 . .. . .. . Infinity.
Plate
+ 6.5 . ..... . 1 megohm.
Fil
Fil + ......... . + n.5 ...... .
+ 115 ..... ..
Plate
Grid 2 ......... .
Fil center ...... . +4.85 ... .. .
0
••••
1
2
3
4
5
6
7
8
Resistance
Volts
E lement
Fil + . . . . . . . . . . +4.8 5 . . . . . .
Plate . . . . . . . . . . . +120 . . .... .
Grid 2 ....... . . . . ....... . ....
F il center . . . . . . . +3 .35 . . . . . .
.....
Gr id 1 ......... . . ....... . .... I
P lat e ... ...... .. +lJ 5
+ 4.85 . . ... . ,
F il
•
•
•
•
0.
0
0
••••
3
4
5
6
1
Infinity.
Infinity.
Infinity.
470 M .
Infinity.
Table X II. R_eceiv e?· 2cl 1·-.f Ct11117Jiifi 1· volLnge ancl
?'<JS1S iance ?Jtensm·em ents ( V li)
Pin
Elemenl
1
2
3
4
5
6
7
8
Res i ~tancc
Volts
+1.36 ... .. . Infinity .
+72 ... .... . Infinity.
+87 ... ... . . Infinity .
Fil . . ...... .. . . .
Plate .......... .
Screen . . . . . .... .
Supp1·essor .... .
Fil center tap ... .
Control grid ... .
0
... ... .. ..
0 ........ ..
0
Fil . ........ .... 0
Tctble X T!l. Receive?· mixe1· voltag e ancl
?·esistance mcasu?·ements ( 117)
Pin
1
2
3
4
5
6
7
8
Valls
Elemenl
Fil . . . . . . . . . . . . .
Plate
Osc anode . . . . . . .
Osc grid . . . . . . . .
Screen . .. .. ....
Control grid ... .
Terminal point . .
Fil .............
•
•
•
•
•
•
•
0
0
0
0
Resistance
Infinity.
Infinity .
Infinity .
270 M.
Infinity.
Infinity.
+ 88 ....... . Infinity.
0 . .........
+ 1.36
+ 76
+ 46 . .... . ..
.. . ..........
+ 46 . .......
••
•
•
•••
•
•
0
•••
••••••
0
0
••••••
T able XIV. Receive?· oscillato1· 11oltnge ancl
1·esistanc e m easlt?·em ents ( V 8 )
Pin
Infinity.
Infinity.
22M.
Infinity.
1
2
3
4
5
22M .
Infinity.
Infi nity.
6
7
8
0
R esistance
Volts
+ 1.36 . . . .
+ 85 . . .
..
+ 85 . . . . .
0
.. . . ..
0 .......
Control grid . . .
......
'T rminal . . . . . . . + 85 . . . . . .
Fil . .
. . . ... .. 0
. . .. . . .
T able V III. Tntnsmitte1· bujfe1· stage voUage ancl
1'6 sistance mea s1wem ents ( V 2 )
Pin
Infinity .
Fil
.. .. .. .
P late . . .. .... . .
Sc1·een ..... . ... .
Suppressol'
..
1
2
TaiJle V II. Tmnsmit.te1· ·r -f 7J01.ve r-nm?Jlifier stctge
vo ltnge and 1·esisl.nnce mea.s·t wements (V1)
P in
Resi stance
Infinity.
Infinity.
Infinity.
Infinity.
Infinity.
Infinity.
Table X I. R eceiver ?'-! am7Jlifie1· voltag e ancl
?'esistance m easurem ents (V 5 )
7
8
T ctble V I. Signal substitution steps
Volts
Fi l .... . ... .. .. . + 3.35 .. .. . .
P late . .... .. . . . . + 90 .... . .. .
Sc reen ..... .. . . . + 86 . .. . .. . .
+ 00 .... .. . .
Tcrmi nal . . .. .. . + 86 .. .. ... .
Control grid ... .
Fil center tap ... .
Fil .. . ... ..... . . 0 . . . . . . . . . .
Volls
Element
Fil ......... . ...
P late ...........
Screen ....... . .
Control grid . . . .
Terminal point . .
Control grid
Fil center tap ....
Fil .... .. .. . ....
+ 1.4 . ......
+ 90 . .... . ..
+ 90 . .......
. .. . . .. .. . . ..
+ 90 . . ......
.............
0
+ 1.4 . ......
•
••
0
Res i ~tancc
--
Infinity.
Infinity.
Infinity.
1.47 meg .
Infinity.
470 M.
••••••
Infinity.
....
22
Table XV. Receive1· 1st i-f voUcLg e and
1·esistcmce nwasu1·ements ( V.9)
1
2
3
4
5
6
7
8
Vo lts
Elemen t.
P in
19. Normal Point-to-point Resistance Values
Res ista nce
Fil ...... ...... . + 1.36 . . . . . .
Plate ... . .... . . . -1- 80 ........
Screen grid .. .. . +so .. . .... .
Suppressor .. .. . 0 .. .. .... ..
0 ........ ..
Contl·ol grid . . . . . . . . . . . . . . . . .
Terminal point . . + 77. 5 ......
Fil . ... .. . . .. ... 0 ......... .
Infinity.
Infinity.
Infinity.
27
Infinity.
Tabl e XV!. R eceive?· 2d 1:-1 voltage ancl
1·.esisumce meastwem ents ( V 10)
Element
Pin
1
2
3
4
5
6
']
8
Volts
Res istance
Fil ...
..... . + 1.38
Plate
. . . . . . . . -1- 82 . . . . . . .
Screen grid . . . . -1-82 . . .....
Supp1·essor
0 ..........
...
. . . . .. 0 ..
Control grid . . . . . . . . . .. . . .
Term in al point . -1- 1.36
Fil . . . . . . . . . . . ......
•
•
•
0
•••••
0
.
0
•
•
0.
•
•
0
.
.
Infin ity.
Infinity.
Infinity.
•••••
••••
•
•
•
0
0
•
2.7
Infinity.
•••
Table XV fl . Receive?· li·m·ite1· voltnge cmcl
1·esistcmc e 11wasu1·ements ( V 11)
Rcs i ~tnnc c
rin
Ele ment.
Vo lts
1
2
3
4
5
6
7
Fil . . . . . . . . . . . . .
Plate . . . . . . . . . . .
Screen grid . . . . .
Suppressor . . . . .
Fil ..... . . . .....
Control grid . . . .
Terminal point . .
Fil . . . . . . . . . . . . .
-1- 1.4 . . . . . . .
-1-86 . . . . . . . .
-1- 69 . . . . . . . .
0 ........ . .
0 .... ... .. .
0 ..........
+ 1.38 . . . . . .
8
0
Infinity.
Infinity.
Infinity.
100 M.
Infinity.
......... .
Tabl e XV/11. Receive?· d·iocle ?'ectifi m· voltnge and
1·esistnnce measu1·em ents ( V 12)
E lement
Pin
1
2
3
4
5
6
7
8
Valls
-
-1- 1.4
0
Fil
Terminal point
Plate
0
0
Cathode
Fil
R eH is l:mcc
Infinity.
270
M.
540
M.
Table X I X. R eceive?· diode 1·ectifim· cmd d- e nmplifier
voltage ancl 1·esistcmce nwasu1·ements ( V 1.J)
Element
Pin
1
2
3
4
5
6
7
8
Volts
-1- 1.4
Fil . . . . .
Plate . . . . . . . . . -/-50
Terminal po int .. -1- 26
Diode . . ..... .
. . . . . 22 .. ...
..
Control grid . . . . ..
•••
0
0.
0
•
•
•
0
•
0
0.
0
Fil
0
••
.. . .
...
•
0
•
•••••••
•
•
0
0
••
Infinity.
. . Infinity.
•••
0
.. . .
•••••
••••
•
•
. . Infinity.
•
•
••••••
... .
ReRistancc
- - --
••
0
270 M.
Infinity.
••
0
••••••
0
••••••
540
M.
Table XX. Receive1· audio voltage ancl
1·esistanc e ?1WCLSU?'e?nent.~ (T114)
Pin
1
2
3
4
5
6
7
8
Element
Fil . . . .
Plate
Screen grid
Volts
•
0
••
R exi:-;tnncc
-1- 1.4 . .
-1-82 . . .
-1- 90 . .
.. ..
. . ..
. . . ..
. . . . . . . . . . . ..... . . . . . .. . . . . .
.. . . . .. .
... . . .. . . . . . . .
Control grid . . . . . .. . . . . . . .
Fil center tap.
0
..
Fil . . . . . . . . . . . -1- 1.4 . . . . . .
•
•
0
••
Infinity.
Infinity.
Infinity.
.
c~. NORMAL RESISTANCE VALUES OBTAINED BY
POINT-BY-POINT MEASUREMENTS. Norma] resistance values obtained by point-to-poin t measurements on Radio Receiver and Transmitter
BC-659-{*) in a satisfactory condition, are indicated below. Use of this data in connection
with similar measurements on fau lty equipment, combined with a logical circuit analysis,
will frequently disclose the source of trouble in
an improperly operating or dead receiver and
transmitter. The r eadings were taken und er the
following conditions, and these must be reproduced exactly if comparison measurements on a
faulty unit are to be effected.
(1) Remove c~tl tub es. Besides producing erroneous readings, tube filaments can be burned
out by the high ohmmeter current used in some
ohmmeters.
(2) Tu1'n nwter swdch to OPER. This position affords the meter greatest protection (prevents high ohmmeter cunent f1·om flowing
through meter) and prevents et-roneous readings by removing the shunting effect.
(3) R emove batte1·y BA-41. Besides providing false ohmmeter readings, the ohmmeter may
be damaged by battery current.
( 4) Turn the volume knob fu ll y clockwise,
turning the power switch on and the volume
control to maximum.
(5) The channel switch may be at A or B.
(6) Both the microphone and headphone
must be disconnected from the set.
(7) All reo1.dings were taken .on the vo ltohmmeter unit of Signal Corps Test Set 1-5 6- ( *).
The meter scale used should give the gr eatest
usable deflection. In general, ohmmeter readings
will be more accul'ate when taken on the upper
two-thirds o:f the scale, and whenever possible,
the range shoul d be chosen that will give inclications in thi s r egion .
b. POWER AND CONTROL CADLE PLUG POINTTO-POINT RESISTANCE VALUES. All measurements are made betwee n plug pins a nd chassis.
Pins on plug are identified by letters.
P in No .
A
B
c
D
E
F
Infinity.
•
Infini ty.
G
II
Open
Open
Open
Open
Open
1 megohm minimum (depends o n curJ'ent leakage through lectrolyLic capacitor C31 ) .
Open
0 ohm
23
c.
INTERNAL BATTERY PLUG RESISTANCE VALUES FOR BATTERY BA-41. All measurements
made as indicated in chart below . P ins are identified by letters as shown in figure 13A. The
pin identifying letters do not appear on the
plug.
Rcadi ng between
Pin
Pin
Pin
Pin
Pin
Pin
A and chassis
B and ch assis
C and chassis
D a nd chass is
E and chassis
A and pin B
Res islnncc
Open
Open
Open
0 ohm
Open
1 megohm
Table XXII
R
r
No.
L8
T2
T3
1- 2 ... ........... . .... . .
3- 4 and 5 ... ... .. . ...... .
Tra~~~~rmcr a nd shield , 2d
T1
No .
T4
T5
CHl
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
CH10
L1
L2
L3
L4
L5
DeHCI'iJ)lion
Choke, r-f . . ....... . ..... .
Choke, r-f . .. . . .... . .. ... .
Choke, r -f . .......... .. . . .
Choke, r-f ......... . ..... .
Choke, r-f . . .. .. .... . . ... .
Choke, r-f .. .......... .. . .
Choke, r -f . ....... . . . .. .. .
Choke, r-f . ... . . ...... . . . .
Choke, r -f ... . ...... . . ... .
Choke, r-f ..... . ... . .. . .. .
Coil , antenn a loadin g*
1- 2 .. . ... .. . . . . . ... . .. .
Coi l, power amplifi er plate •:•
1- 2 .. . ......... ..... . . .
1- 3 .. . . ....... . .. . .. .. .
1- 4 ..... ... .. . . .. .. . . . .
Co il a nd shi eld , jJOwera mplifier *
1- 2 . ....... .... ....... .
1- 3 . . ... ....... . .... . . .
Coil and shi eld , buffer grid ':'
1- 2 .. ..... . . .. . .. ... .. .
1- 3 . . . .. .... . . ...... . . .
Co il and shi eld , tran smitter oscillator*
2- 1 ............. .. .... .
2- 3 ... ............... ..
2- 4 ................. . ..
L6
L7
Co il and shi eld, r -f gr ieF'
1- 3 . . . . ..... . .... . . .. . .
Coil and shi eld , mixer g rid *
1-3 ... ................ .
D-e resistance
0.13 ohms
40 ohms
40 ohms
0.13 ohms
40 ohms
10 ohms
O.J 3 ohms
40 ohms
0.13 ohms
0.13 ohms
0.024 ohms
0.012 ohms
0.009 ohms
0.0 07 ohms
0.006 ohms
0.012 ·ohms
0.107 ohms
0.034 ohms
0.017 ohm s
0.032 ohms
0.089 ohms
0.019 ohms
0.019 ohms
D-e resistance
O.D1!J ohms
3 ohms
225 ohm s
i -F
T ctble XX I. No1·mal choice coil nncl tnm~forme?· d-e
1·esis tanc e vnlues BC-U59- ( * )
R c(
Descri ption
Coil and shield, receiver oscillator *
1- 2 .. . .. . .. . . . .... ..... .
Transformer, micr·ophone
1-2 . ....... . ......... . . .
3- 4 ................. .. ..
Transformer and shield , 1 t
T6
2.7 ohms
2.7 ohms
1- 2 . . . . .. .. ... . . .. ..... .
2.7 ohms
3-4 .. .................. .
2.7 ohms
Tran sformer and shi eld, 3d
i-f*
1- 2 . . . ... ..... . ....... . .
2.7 ohms
3-5 ................. . .. .
2.7 ohm
5- 4 .................. . .. J oo,ooo ohms
Transform er and shi eld, discriminator •:•
1- 2 .. ... . ... ...... ... . . .
1.7 ohms
5-3 ...... . . ....... ... . ..
1.8 ohm s
5-4 .... .............. . ..
0.9 ohms
Transformer, output
1- 2 .... . ........ ....... .
750 ohm s
3-4 . .. . . ......... . ..... .
0.35ohms
(with speaker
discon nected)
*See figure 29.
20. Moistureproofing, Fungiproofing,
and Refinishing
After the set h as been repaired and is functioning correctly a check should be made of the date
of the last moistureproofing and fungiproofing
treatment. If new treatment is required, see
TB SIG-13 and TM 11-615 for the method of
application. If the receiver has been scarr ed or
chipped, remove any r ough paint and touch up
spots with a small bru h. If the case is sufficiently scaned and scratched to warrant complete refi ni shing, remove the chassis from t he
case and mask or remove parts whi ch are not to
be refin ished. Spray the entire case with ·i he
proper paint authorized by existing regulations.
)
24
Tl)
ro#s LU G
ON v14 SOCKET
TO POWER
a CONTROL
CABLE PLUG
PIN - E
ON
v12
TOll? LUG
ON METERING
SOCKET
7 LUG
SO CKET
To#e LUG
ON METER ING
SOCKET
ro#3 LUG
ON MET E RIN G
SOCKET
T0"3LUG
ON V10 SOCKET
@o
0
:D
:D
"
t£J
:D
"'
<0
0
::<
:r
~
TO SW
a
TO POW R
CONTROL GAB LE
PLUG -PIN-8
1
T0"5 LUG
ON v 14
SOCKET
~~ 0
- ~0
TO GE NT ER LUG
ON R4o(VOLUME
CONTROL)
0
0
PiguTe 14. T erminal Boanl View, Raclio Receive?- ancl Tmnsmitte?· BC-IJ59-(* ).
T0'*3L U G
ON v
9
SOCKE T
SECTION VII
FINAL TESTING
21. Alignmen+ Check
Although the unit was correctly aligned during
the repa:ir procedure, a recheck of set alignment is necessary after the moistureproofing
and fungiproofing treatment has been completed. Check alignment as shown in section V.
After the alignment has been checked, over-all
performance tests are made as outlined below.
22. 1-f Selectivity Test
For t esting i-:f selectivity follow t he procedure
outlined below.
a. Adj ust the s·ignal generator to i-f frequency 4.3 me and connect it to pin No. 6 of the
converter tube.
b. Adjust.the signal generator voltage to give
1 volt at pin No. 3 of the metering socket.
c. BANDWIDTH DETERMINATION. Double the
output voltage of the signal generator.
(1) Vary frequency of signal generator of
i-f in .tur n until at each frequency extreme output of radio set reads 1 volt at pin No. 3 of the
metering socket.
(2) Bandwidth is the difference in frequency
readings. Bandwidth shall be between 45 kc and
60 kc.
(3) Repeat the same procedure with the signal generator volta re output 10 times the value
in b above. Bandwidth limits should be between
45 kc and 120 kc.
(4 ) Repeat the same procedure at 100 times
the signal generator voltage of b above. Bandwidth limits should be between 45 kc and 200
kc.
,
(5) Repeat same procedure at 1,000 times
the signal generator voltage. Bandwidth shall
be between 45 lee and 300 kc.
(2) Connect the chassis of the receiver to
ground.
(3) Tune the receiver to 38.9 me.
b. Set the signal generator at the i-f frequency ( 4.3 me). Adj ust the generator voltage
to a 10-microvolt (11-v) output.
c. Record voltage reading at pin No. 3 of the
meter socket. This r eading is V in e below.
d. Set signal generator at 38.9 me, and adjust voltage output of the signal generator so ·
that it r eads the same on pin No.3 as in c above.
Record signal generator output on chart. This
reading is V2.in e below.
e. The ratio V of the signal generator outV2
put voltages is the i-f rejection ratio. It shall
be greater than 40,000 to 1. Formula: i-f rej ection ratio= V .
V2
24. D-e Amplifier Gain Tes+
For t esting d-e amplifier gain follow the procedure outlined below.
·
a. Connect the signal generator to pin No. 6
of t he mixer tube and set it at 4.3 me.
b. Adjust the signal generator to give -6
volts on pin No. 4 of the meter socket. This
voltage.is E1 in d below.
c. Record the voltage on pin No. 7 of metering socket, then change frequency of the signal
generator until voltage at pin No. 7 shifts by
0.1 volt. Note the voltage at pin No. 4 of the
metering socket. This reading is E2 in d below.
d. Difference between the readings of voltages on pin No. 4 (E1- E2), multiplied by 10
is the d-e gain. It should not be less .than 15.
25. Image Rejection Ratio Test
For testing .image rej ection ratio follow the procedure outlined below.
a. Connect the signal generator as in paragraph 23.
b. W-ith the signal generator set to 30.3 me,
adj ust the generator output to 10 mv. This read-
23. 1-f Rejection Ratio Test
cc For testing i-f rej ection ratio fo llow the
procedure outlined below.
( 1) Connect the signal generator to the antenna throogh a 2,000-ohm resisLor.
25
26
ing is G in subparagraph d below. Note reading
at pin No. 3 of the metering so~Jcet .
c. Set ,t he signal generator to 38.9 me and adjust its output to give t he same reading at pin
No. 3 as in subparagraph b above. Note the output voltage of 1the signal generator. This reading is G2 in d below.
d. The rati o G of the two signal generator
G2
voltages is the image rej ection ratio. It shall
not be less than 2,000 'to 1.
26. Receiver Sensitivity Test
For testing receiver sensitivity follow t he procedure outlined below.
c&. Connect the signal generator as in paragraph 23.
b. Adjust the generator outp ut to gi ve 1 volt
at pin No. 3 of the metering socket at each of
the following freq uencies : 27.2 me, 33.5 me,
and 38.9 me.
c. The signal generator output must not exceed 20 mv.
27. Audio-frequency Response Test
' c~. PROCEDURE. For rtesting a-f freq uency response follow t he procedu re outlined below.
( 1) Connect t he a udio oscill ator to pin No.
7 of the metering socket.
(2 ) Adjust it so that 2.7 volts are applied.
b. MEASUREMENT OF AUDIO OUTPUT. Thereceiver output is fed to a 10,000-ohm impedance
outp ut meter, and the audio output measured
as various aud io freq uencies are applied. L·irnits for acceptance shoul d be as listed below:
Table XXI!I. F'1·eqnency 1·es ponse
Fre<tue ncy settin g
Minimum output in
vo lt s
2GO cps
J ,000 cps
3,000 cps
18.3
20
8.4
28. Transmitter Power Output
For testing transm itter power output fo ll ow the
pr·ocedure outlined below.
a. Check the power output of the transmitter
at 27.2 me, 33.5 me and 38.9 me. Use a 300-ohrn
car bon resistor in series with a 0 to 100 r -f milliameter, connected across t he antenna post and
chassis. This simulates t he equivalent rad iation
resistance of a half-wave vertical antenna.
b. Minirn~w~ output should be at least 65 rna
on all frequenc'ies.
29. Transmitter Neutralization
For testing transmitter neutralization fo llow
the procedlll'e outlined below.
a. T urn the fina l amplifi er switch OFF.
b. See that PLATE CHECK OPER. switch
'
on ,t he front panel, is at CHECK.
c. Tune t he fi nal amplifier capacitor t hrough
resonance.
d. Observe the panel meter. It shoul d not deflect mor e t han 1 division.
e. Conduct this test at 27.3 me, 28.1 me, 35.5
me and 38.0 me.
SECTION VIII
INDIVIDUAL STAGE AND CIRCUIT REPAIR DATA
30. Filament Circuit
The filament circuit, because of the many bypass capa;citors, can give tr·oubles which will be
indicated as shorts or leaks in the power cable
plug. Check for proper resistance measurements.
Table XXIV. Fila1nent t1·onble lo cat·ion*
Pi n C
Pins F and G
C31
C36
C47
C52
C56
C61
C29
J
Cll
C23
•S hol'ts or unu sua ll y hig- h lea ka ge in the pin connections will in . .
dicate fau lty comrlo ne nts li sted.
3 I. Receiver R-f Amplifier No. I
a. GENERAL. If in signal tracing the results
indicate the l'eceiver r-f amplifier to be inoperative, trouble may be read ily located by referen ce to the voltage and resistance chart.
b. VOLTAGE CHECK. If there is an absence of
plate voltage, check choke CH6 and resistor R20
for continuity. If the voltage, as applied to the
plate, is low, capacitor C32 might be found to be
leaking. If voltages are found to be normal
check capacitor C33 for open. This is usually
done by Nacing a capacitor of approximately
t he ,<;a mo va lu ' in parallel with t he component
JJejng tested. If trouble is not located in the
above s teps, the grid circuit a nd tuning components should be checked. Capacitor C30 should
be checked for open. Such a condition will prevent the inj ection of the r-f signal on the grid
of V5. If capacitor C30 is shorted, the voltage
on the grid pin No. 6 will be highly positive.
Resisitor R19 would show evidences of burning
if this condition were allowed to persist. Check
resistor R19 for proper value. Should resistor
R19 be open the r-f stage would in some cases
motorboat. (Motorboating is a very low-frequency a udio Dscillation). See the transmitter
r-f power-amplifier stage repair for tests on 1the
tuning section.
Table XXV. Receive1· 1·-j ant7Jlijie1· No. 1 (fig. 15)
'Hef
No.
Signal Corps
s tock No.
C31
C32
Name of purL and desc dptioa
CAPACITOR: fixed; 0.005-mf, + 80'j,,, - 20'Y,,, 300 vdcw.
CAPACITOR: fixed; 0.005-mf, +80%, -20'/r , 300 vdcw.
C33
CHG
R19
3DA1- 48
3C362-2
326747- 10
R20
3Z6100- 9
V5
I
CAPACITOR: fixed; 0.001-mf, + 14 %, - G'f,,, 300 vdcw.
CHOKE: r-f; 120 mh at 1,000 cycles.
RESISTOR: fixed; carbon, insulated, 470,000 ohms ± 10%,
%-watt.
RESISTOR: fixed; carbon, insulated, ] ,000 ohms ± ]0 '/r '
1h -watt.
TUBE JAN lLNG (VT- 179).
28
Function
Filament bypass, V5.
Sc reen grid bypass,
V5.
Coupling V5 to V(i.
Plate, V5.
Co ntrol grid, V5.
B+ dcco upling V5.
Receiver r-f amplifier
No.2.
29
35
MMF
V5
JAN 1LN5 (VT-179)
REC'VR
·R-F AMP .
No . 1
l1 BOTTOM '!lEW
l2 BOTTOM VIEW
R-F AMP.
No.1
OUTPUT
C30
CH6
50 MMF
120
mh
POWER PLUG PIN C
NOTE:-CHANNEL SWITCH
SW5
SHOWN IN CHANNEL
'B' POSITION.
1,ooo n
R20
M1
BLK .
CH1
5 .58 mh
RED
METER SW ITCH
(REAR VIEW)
POWER
PLUG
PIN B
SW ITCH LEGEND
0 - OPERATE
C - CHECK
F- FILAMENT
p- PLATE
l
C6
!
.005
__ MF
SW2
RED-BLU TR
RED
NOTE 1: Voltages are nominal DC and are measured in receive
position with a vacuum tube voltm e ter between point indicated
and cha ssis . Se t conn ected to PE-117-( * ) with fully charged
storage battery. Fresh Battery BA-41 installed and tubes in place.
VOLUME con tro l full on. Meter switch at OPERATE. Channel
switch at A or B. Switches SW-1 and SW-2 at ON . Handsel
plugg e d in .
NM - Not measured.
o n- ov
1NF - + SOV
4 70M !1 - NM
INF - +1.2V
IN F - +SOV
NOTE
3
NC - Not co nnected.
NOTE 2: Resistance values are nominal and are measured between point ind icated and chassis. VOLUME control full on .
Meter switch at OPERATE . CHANNEL switch at A or B. Switches
SW-1 and SW-2 at ON. 'Handsel and power cable disconnected.
All tubes and Battery BA-41 removed.
NM- Not measured.
NC - Not connected.
NOTE 3 : SOcket terminal used as tie or dummy lug Qllly. No
tube element connects to this lug.
TL 19015
Fig1.~1·e 15. Sc he?natic wi1-ing d·ic~.gnt?n {l.1·st 1'-f .~t.Cl._q e , Rnclio R eceive1· a11cl TrCl.nsmi/,/.e?" B C- 65 .9- ( *).
30
32. R-f Amplifier No. 2
a. GENERAL. See paragraph 18 a.
checked for proper resistance values. If troub l ~
is not located by voltage checks trouble may b~
loca ted in the grid or grid tuning circuits. Check
coil L6 for continuity and switch SW9 for
proper contact with B3 and A3 capacitors. Additional trouble may be encountered in the form
of motorboating due to open capacitors C36 or
C37.
b. VovrAGE CHECK. If there is an absence of
plate voltage check resistors R21, R22, and also
capacitor C37. The components should be
checked for proper value. In the case of capacitors check for short. If the voltage as applied
to the plate -is low, check capacitor C38 and C37
for leakage. Resistors R21 and R22 should be
Table XXVI. Receive1·1·-f amplifie?· No. 2 (fig. 10 )
Ref.
S i,::-nnl Corps
slack No.
No .
C34
C35
C36
C37
C38
L6
R21
3DA1-48
2C5379 ( ) / C3
3Z6610- 7
R22
3Z6100-9
3D9050-V-29
3D9050V-30
SW9
V6
.
'WllC h S W!) l:i
J) CIIt
Name of pnrt and dcnc l'ipli on
-
CAPACITOR : variable ; 50-nunf, maximum.
CAPACITOR : variable; 50-mmf, max m1um.
CAPACITOR: fixed; 0.005-mf -1- 80 %, - 20'/r, , 300 vdcw.
CA.PACITOR: fixed; 0.005-mf -1- BO'Yo , -20'/o, 300 vdcw.
CAPACITOR : fixed; 0.001-mf -1- 14'/r;, - 6 %, 300 vd cw.
COIL AND SHIELD : r-f grjd.
RESISTOR: fi xed; carb on, ins ulated, 10,000 ohm s
± 10'/o , l!J -watt.
RESISTOR: fix ed; carbon, iJ1sulatecl, 1,000 ohms
± 10 %, %-watt.
SWITCH: chann el changing.
TUBE JAN lLNG (VT-179) .
Of chann el c hangint~ switch 3%8311 1.
---
Function
-
Tuning L6, channel B
Tu ning L6, chan nel A.
Fi lament bypas · V6.
B + bypass, V6. '
·
Coupli ng VG to V7
Gr id, VG.
.
Plate load, V6.
B + decoupl ing, V6.
V6 grid.
Receiver r -f a mplifier
No.2.
-
31
V6
JAN ILNS (VT-179:
REC' VR
R-F AMP.
No. 2
.001
MF
R-F AMP.
NO. 2 OUTPUT
c:
R-F AMP .
0
0
·'lO. 1 OUTPUT
0
o'
C36
C37
NOTE:-CHANNEL SWITCH SW9
SHOWN IN CHANNEL ' B' POSITION .
1,ooo n
:---~---- -~I
I
2
.....---"\/'1/V'.Mrv--+ POWER PLUG PIN B
R22
-4.,_--- --- ----------
PO\VER PLUG PIN C
I
: _____
0 __:
I
I
I
I.....
l6 BOTTOM VIEW
INF - + 71V
o n - ov
o n- NM
INF - + 1.2V
NM - NM
NOTE 1: Voltag e s are nominal DC ond are m ea sure d in re ceive
position with a vacuum tub e voltm e te r b e tw een po int indicated
and cha ssi s. Se t conn e cte d to PE · 117 ·(' ) with fully cha rged
stora ge batte ry. Fresh Batte ry BA-41 in stall e d and tub e s in place.
VOLUME control full on . Me te r switch at OPERATE . Channel
switch at A or B. Switch es SW -1 and SW-2 at ON Handse t
plugg e d in.
NM - Not m e us ure d .
NC' - Not conn e cte d .
NOTE 2: Re sistance valu e s are nominal and are m easured betw een point indicate d and cha ssis. VOLUME con trol full on .
Mete r switch at OPERATE. CHANNEL switch at A or B. Switches
SW-1 and SW·2 at ON . Ha n dse t and powe r cabl e disconn e cted .
All tub e s and Batter y BA-4 1 re mov e d .
NM - Not m ea sured :
NC - Not conn e cted.
TL 19 016
F'igm·c 10. Sch em a.l ir ?Virin,q dia.IJ?'fL?n second ?'· f stage, Radio R eceive?· nne/ T mnsmitte?' TJ C-0!>.9-( * ) .
32
33. Receiver Mixer Stage
a. GENERAL. See paragraph 18.
b. PLATE VOLTAGE. If the voltage check indicates no plate voltage a check shall be made of
the continuity of T2 primary. Also check capacitor C28 for open and capacitor C49 for short.
Low plate voltage would indicate capacitor C49
to be in a leaking condition. The screen voltage
as measured on pin No. 5 will be absent if resistor R26 is open or capacitor C48 is shorted.
Low screen voltage will ·i ndicate a partially
shorted (leaking) capacitor C48. If the resistance to ground on pin No. 4, the oscillator injection grid, is wrong, refer to the next para-
graph for repair procedure on the receiver crystal oscillator. The a:bsence of proper voltage at
this point will not have too great an effect on
the operation as an amplifier of the receiver
mixer stage; however, a thorough check of the
grid circuit should be made. The operation of
switch SWlO and the contin uity of coil L7
s!1ould be checked before trouble shooting the
receiver crystal oscillator stage. If, after proper
operation· of the receiver crystal oscillator stage
is ascertained, the receiver mixer stage persists
in causing additional trouble, check capacitor
C47 for open circuited condition. This component ( C47) may cause oscillation.
Table XXVII. Receive1· 1nixe1· (fig. 17)
R ef
No.
C39
C40
C47
· c48
Signal Corps
stock No.
3D9050-V-29
3D9050V-30
C49
C50
CH7
L7
R2G
Part of T2
3C3G2-1
2C5379 ( ) /C5
3ZG615-1
R27
Part of T2
R28
3Z6082
SWlO
T2
V7
2Z9978-2
Function
CAPACITOR:
CAPACITOR:
CAPACITOR:
CAPACITOR :
variable ; 50-mmf maximum.
variable; 50-mmf maximum.
fix ed; 0.005-mf, +80'/o , -20 '/o , 300 vdcw.
fix ed ; 0.005-mf, +80'1o , -20 % , 300 vdcw.
CAPACITOR: fixed; 0.005-mf, +80 % , -20 % ,300 vdcw.
CAPACITOR: fixed; 5-mmf ±5 % , 500 vdcw.
CHOKE: low r-f; 5.58 mh at 4 me.
COIL AND SHIELD: mixer gr id.
RESISTOR: fixed; carbon insulated, 15,0 00 ohms.
RESISTOR: fixed; carbon insulated, 470,000 ohms
±10 % , 1h -watt.
RESISTOR: fixed; carbon, insu lated , 850 ohms ±10%,
%-watt.
'''SWITCH: channel changing.
TRANSFORMER AND SHIELD: 1st i-f.
TUBE JAN lLCG (VT- 178).
*Sw itch SWlO is part of chann e l cha nging s witch 3ZH311 I.
Tuning L7, channel B.
Tuning L7, channel A.
Filament bypass, V7.
Screen and anode grid
bypass, V7.
Plate bypass, V7.
Paclder T2 primary.
Filament, V7.
Grid V7 mixer.
Screen a nd anode grid
dropping V7.
Loading, T2 primary.
B + decoupling, V7.
V7 grid.
Interstage coupling.
Receiver mixer.
33
V7
REC'VR . XTAL
OSC. OUTPUT
R-F AMP.
NO. 2
OUTPUT
JAN 1LC6 (VT-178)
REC'VR MIXER
CJB
--J----,--t. .-- -- - +----4...:::...l.,
_001 MF :
3
------------1---:
T2
V9 GRID
I
I
I
-=-
--
I
I
I
3
r---------- -1
,cso
NOTE: - CHANNEL SWITCH SW10
SHOWN IN CHANNEL 'B' POSITION.
I
I
I
C47
:(Q):
l 0 l
,--------,
I
2
I
I
.005
MF ~
I
I
I
C48
POWER PLUG
IX
R28
PIN B
MF
POWER PlUG
PIN B
I
I
~- ----- .,
POWER PLUG
PIN C
l7 BOTTOM VIEW
YEL
RIVET
T2 BOTTOM VIEW
270M !:'! - NM
INF · + SOV
INF - +76V
INF -
+1.2V
o n- NM
INF · + 86V NOTE 3
NOTE 1: Voltag e s are nominal DC and are me asure d in re ceive
position with a vacuum tub e voltm e te r be tw ee n point indicate d
and chassis. Set connecte d t-o PE-117 -( • ) w ith fully charge d
storag e battery. Fre sh Batte ry BA-41 instal:ed and tubes in place.
VOLUME control full on . Me te r switch at OPERATE. Channel
switch at A or B. Switch e s SW-1 and SW-2 at ON. Handset
plugged in.
NM- Not measure d.
NC - Not connected.
NOTE 2: Re si stance valu e s are nominal and are measured between point indicate d an d chassis . VOLUME control fuiF on .
Meter switch at OPERATE. CHANNEL switch at A or B. Switches ·
SW-1 and SW-2 at ON . Handse t and power cable di sconnecte d .
All tubes and Batte ry BA-4 1 re move d.
NM - Not m easure d .
NC - Not connecte d .
NOTE 3: Sock e t te rminal use d a s ti e or dummy lug only . No
tube ele m e nt conne cts to this lug .
ru 9 o 17
Figm ·e 17. Sc hem.atic wi1·ing cl·icwra?n ?"eceive?· ?nixe?· stag e, Raclio R eceiv e?· ancl T m nsmitte1· B C- 659-(*) .
34
34. Receiver Crystal Oscillator Stage
The first step in trouble shooting the receiver
crystal oscillator stage is to measure the crystal
activity as described in secion V. If after this
test the crystals used for t he A and B bands a1·e
found to give the proper activity the tube socket
voltages should be checked for proper values. If
the plate voltage as measured on Pin No. 2 is
absent, check choke CH8 for continuity. If the
plate voltage measured is low, check capacitor
C42 £or leakage. The screen voltage should be
normal at all times for it uses a direct line from
the power supply through the power cable. The
voltage measured on pin No. 6 should be present
if the receiver crystal oscill ator is oscillating.
If oscillation is not indicated, check capacitor
C41 for open or short. lf oscill ation is not present, capacitor C42 should be checked for open,
also capacitor C44 and C45 shou ld be checked
for short.
Table XX11Ill. R eceive?' c1·ysial oscillaio1· (fig. 18 )
Function
Ref
No.
SiJ.!'nal Co rp:;
~; lock
No.
- --
C41
3DA1-48
C42
C43
3DD025- 20
C44
C45
C46
3D9050V-29
3D9050V-30
CH8
LS
3C362- 2
2C5379 ( ) / C4
R23
3Z4534
R24
3Z6747-10
R25
3Z6727
SOl
SWll
SW12
V8
XTAL A
XTAL B
Na me uf pal't. anti cl c:,;crip Uon
-CAPACITOR:
· - - - - - fix
d; 0.001-mf, +14 % , - G'/o , '00
vdcw.
CAPACITOR : fixed ; 25-mm£, -1-5'/r . 300 vdcw .
CAPACITOR: fixed; 0.005-mi, -1-80 '/o , - 20'/o , 300
vdcw.
CAPACITOR:
variable; 50-mmf maximum.
CAP A CIT OR: variable ; 50-mmf maxim um.
CAPACITOR: fixed ; 0.005-mf, -1- 80'/< , - 20'/t: , 300
vdcw.
CHOKE: r-f; 120 mh at 1,000 cycles.
COIL AND SHIELD: receiver oscill ator ; frequ ency range, 26.7 me to 34.G me.
RESISTOR: ftxed; carbon, insulated, 1-megohm,
±10 % , %-watt.
RESISTOR: fixed; carbon, in sulated, 470,000 ohm s,
±10 % lfz-watt.
RESISTOR: fixed; carbon, insulated, 27 0,00 0 ohms,
· ± lO o/o , %-watt.
SOCKET : crystal, 4-contact.
'''SWITCH : channel changi ng.
*SWITCH: channel chang ing.
TUBE JAN-3D6 / 129D (VT-185).
CRYSTAL UNIT: chann el A.
CRYSTAL UNIT: channel B.
•SwiLch SW ll anu SWJ.2 arc l'"'t of chann el chang in g- "wiLch
3 Z8~ 11
1.
Crys tal :feedback co upling.
Coupling V8 to LS .
B + bypass, V8.
Tun!ng L8, chan nel B.
Tunmg L8, channel A
Receiver oscillator m e~
tering lead bypass.
P late, V8.
• Grid, V7 oscillator.
Isolating, V8 grid mct ermg lead.·
B ias, V8.
Mixer bias, V 4.
Receptacle for crysta ls.
Crystal changing
V7 oscillator.
·
Receiver c1·ystal oscillator.
Rece ive r stabili ty
Receiver stabil ity:
-
35
VB
JAN 3D6 / 1299 (VT-185)
REC'VR XTAL OSC .
V7
PIN No. 4
2
C43
POWER
PlUG
PIN B
!oosMF
WHT-RED TR.
WHT - ORG TR.
POWER
PLUG
PIN C
WHITE-BUR .
M1
BLK.
NOTE: -CHANNEL SWITCH
SWllAND SW12
SHOWN IN CHANNEL
B POSITION
RED
METER SWITCH
(REAR VIEW )
co
c:0
"'
N
0
SWITCH LEGEND
0 -"
CFP-
:©:
\0\
S02
OPERATE
CHECK
filAMENT
PLATE
METERING
SOCKET
(LUG VIEW)
,. ----- --,
I
I
....
______ _,
NOTE 1: Voltag es are nominal DC and are measured in reteive
position with a vacuum tube voltm eter betw ee n point indicated
o nd chCISs is. So t co nn ected to PE-, 17 -( · ) with fully charg ed
I
I
sto1ago lw tt ory . fre sh Bott ery BA·41 in sl a llod oml tubes In pl occ .
VOLUME co ntrol f ull on. M eter sw itch at OPERATE . Ch a nn el
l8 .BO TT O M VI EW
tt w it ch
c1f
A or 0,
w lt c h os SW - 1 o p d SW -'J. a t O N .
Hantfic t
p1U!;J9CU in.
1.47 MEG NM NOTE 3
INF -+ 90V
IN F -
+86V
NOTE 3
INF · +86V
470MO - NM
JNF - + 1.2V
0 0 - 0V
NM - Not measured .
NC - Not connected .
NOTE 2: Res istance va lu es are nominal and are measured betwee n point indicat ed and chassis . VOLUME control full on .
M eter sw;tch a t OPERATE . CHANNEL swi tch at A or B. Switch es
SW -1 and SW -2 at ON. Handset and pow er cable disconnected.
All tub es and Battery BA-41 removed.
NM - N ot mea sured .
NC - N ot c011n oct cd .
NOTE 3 : Socket terminal used a s ti c or dummy lu g on ly. N o
tub e c lement co nn ects to thi s lu g .
TL I 90 18
Ji'ignre 18. Sc hc lll.ll).ic ·wi•ri11r; diagmm oscillc~to?· stage, Radio R cceive1· and T?·ansmitte?· DC-659-(*).
36
35. Receiver 1-f Amplifier No. I
a. GENERAL. See paragraph 18.
b. VOLTAGE CHECK. If the voltage as measured on pin No. 2 plate circuit is absent check
transformer T3 primary and resistor R29 for
continuity. Capacitor C53 should be checked for
sh ort. If tthe voltage on the plate is low, check
capacitor C53 for leakage. The voltage on the
screen will be effected by the same component
break-down as the plate. The . resistance to
ground on the No. 6 terminal (control grid)
should be measured. This will determine thE!
continuity of secondary transform er T2. Osci l ~
lation in the i-f amplifier may be traced to an
open capacitor C52 or C53.
.
Table XXI X . R eceive1· i-f amplifier No. 1 (fig. 19)
Ref
No.
C51
C52
C53
C54
CH9
R29
T2
T3
V9
SignH I
Co •·n"
s lock No.
Part of T2
Part of T3
3C362-1
3Z6082
2Z9978-2
2Z9978-3
N ame oi p·n rt and description
CAPACITOR: fixed; 20-mmf ±5% .
CAPACITOR: fixed; 0.005-mf + so r;,,, - 20%, 300 vtlcw.
CAPACITOR: fixed; 0.005-mf -1-80'/o , - 20 </o , 300 vdcw.
CAPACITOR: fi xed; 20-mmf ±5',1,,.
CHOKE: low r-f; 5.58 mh at 4megacycles.
RESISTOR: fixed; carbon, insu lated, 850 ohms ±10%,
1h -watt.
TRANSFORMER AND SHIELD : 1st i-f.
TRANSFORMER AND SHIELD: 2d i-f.
TUBE JAN 1LN5 (VT- 179).
Function
Paddcr, T2 primary.
Filament bypass, V9.
B+ bypass, V9.
Padder, T3 primary
·
Filament, V9.
B + dcco upling V9.
Interstage coupling.
coup ling.
Rece1ver 1-f amplifier
No. 1.
Inte 1:stag~
-
V9
JAN ILNS (VT -179)
REC'VR
1-F AMP.
RIVET
T2 BOTTOM VIEW
TJ BOTTOM VIEW
REC_:_V~- ~ __ ___ _:1_
T2
T3
3
:l
V10 GRID
MIXER
OUTPUT
MF
R28
R29
POWER PLUG
PIN B
~---8-s-o~n~~~----+---------------------~~~s~s~o~
n~.-- ~==
--~-~
-~
--~------------------~(S~.s1s}(rm)h~------~~'POWER
CH9
PLUG
PIN C
NOTE 1: Voltag e s are nominal DC and ate me a sure d in re ce ive
position with a vacuum tub e voltm e te r be tw ee n point ind,icate d
a nd cha ss is. Se t conn e cte d to PE-117-(-) w ith fully cha rge d
storag e batt e ry . Fres h Batte ry BA-41 in stall ed a nd tub es in p lace.
VOLUME control full on. Me te r sw itch at OPERATE. Chann e l
sw itch a t A or B. Swi tch es SW-1 and SW -2 at ON. Hand set
plugg ed in .
0 !"2- 0V
INF - + 77V
INF - 1.2V
NM - Not me a sure d .
NC - Not conn e ct ed .
27 !"2 -NM
INF + 76V - NOTE 3
NOTE 2: Res istance valu es are nominal and a re mea sure d b etw ee n point indi ca le d and cha ss is. VOLUME control full on .
Me te r switch at OPERATE . CHANNEL switch a t A or B. Sw it che s
SW -1 and SW -2 at ON Ha nd set and pow e r ca bl e di sconn e ct e d.
All tub e s and Batte ry BA-41 re mov e d .
NM - Not measure d .
NC - Not conn e ct ed.
NOTE 3 : Sock e t te rminal use d a s ti e or dummy lug only. No
tub e e le me nt conn e ct s to thi s lug .
- '. 1901 9 ,
Figtwe 19 . Schenw.tic 1.ui1·ing dia.gm11t fi? ·st i-l stage, Rad·io Receive?· and Tmnsmitte1· BC-65.9-(* ),
38
36. Receiver 1-f Amplifier No. 2
a. GENERAL. See paragraph 18.
b. VOLTAGE CHECK. If no plate voltage is
measured on pin No. 2 the primary of transformer T4 and resistor R2 should be checked
for continuity. Also capacitor C57 should be
checked for short. With the exception of transformer T4 continuity meas urement the screen
measured on pin No. 3 is subj ect to the same
component failure if no voltage is measured .
Low voltage meas ured on the plate and screen
can be cau sed by a leaking capacitor C57 . A continuity measurement of the grid circuit (pin
No. 6) should be made to asceltain the continuity of the secondary oJ the i-f transformer
T3. Oscillation may be ca used by an open ~ir­
cuit condition in capacitors C56 and C57,
Table XXX. Rec eiver i-f ampli jie1· No . 2 (fig. 20)
R f
No .
S ignal Col'p"
stoc i< No.
C55
C56
C57
C58
CI-llO
R29
Part of T3
.Part of T4
3C3 62- l
3Z6082
R30
Part of T4
R32
3Z6082
T3
2Z9978-3
T4
2Z9978-4
VlO
Name of P'Hrt and desc l'iption
CAPACITOR: fixed; 25-mmf, ±5'/c , 500 vdcw.
CAPACITOR: fix ed; 0.005-mf, -1- 80%, - 20 %, 300 vdcw.
CAPACITOR : fix ed; 0.005-mf, -1- 80'/r•, - 20'1'o , 300 vdcw.
CAPAC ITOR: fi xed; 20-mmf, ±5'/o, 500 vdcw.
CHOKE: low r-f; 5.58 mh at 4 me.
RESISTOR: fi xed; carbon, insulated, 850 ohms, ± 10 %,
1h-watt.
RESISTOR: fi xed; carbon, in s ulated, 470,000 ohms, ± 10 '/c ,
1h-watt.
RESISTOR: fixed; carbon, insulated, 850 ohm s, ± 10'..{.,
lh-watt
TRANSFC>RMER AND SHIELD : 2d i-f; includ es C54
and C55.
TRANSFORMER AND SHIELD : 3d i-f; includ es C58,
C59, and R30.
TUBE JAN 1LN5 (VT- 179).
-----
Function
--------
P~dder, T3 secondary
F1 lament bypass v 10 ·
B + bypass, vw:
··
Paclcler, T4 pr imary
F ilament, V 10.
··
B + deco upling, V!:>.·
Loading, T4 pr im ary.
B+
decoupling, VlO.
Interstage coup! in g .
Interstage couplin g.
Receiver i-:f: ampJi fi el·
No.2.
39
V10
JAN 1LN5 (VT-179)
REC'VR
1-F AMP_
RIVET
T3 BOTTOM VIEW
T4 BOTTOM VIEW
V10 GRID
V9 OUTPUT .
R29
POWER PLUG
PIN B
850 Q
POWER PLUG
PIN C
GRN
MEG
R33
502 .
METERING
SOCKET
(LUG VIEW)
0 0-0V
INF - + 79V
2 .7 0- NM
INF -+ 1.2V
INF
+ 1.2V - NOTE 3
NOTE 1: Voltag e s ore nominal DC and ore me asured in rece ive
position with o vacuum tub e voltmeter be tween po int indicated
and cha ssis . Se t conn e ct e d to PE -117-( ' ) with fully charged
st orag e batte ry . Fresh Batt ery BA-41 install ed and tubes in place .
VOLUME control full on . Me ter swi tch ol OPERATE. Channel
sw itch at A or B. Switch e s SW-1 and SW-2 ol ON . Handset
plugged in .
NM - Not m eas ured .
NC - Not conn e cted .
NOTE 2 : Resistance values ore nominal and ore measured between point indicat e d and chassis. VOLUME control full on.
Meter switch at OPERATE . CHANNEL switch at A or B. Switches
SW-1 and SW -2 at ON . Handsel and power cable disconnected.
All tubes and Battery BA-41 remove d.
NM - Not m e a sure d .
NC - Not connected .
NOTE 3: Socket terminal used as tie or dummy lug only . No
tube e le m e nt connects to this lug .
TLI9020
Figure 20. Sch em a~ic wi?·ing cliagrnm second i-f nmplijie?· stng e, Radio R eceive1· and Tmn smitte1· BC-o!i9-(*) .
40
R34 for continuity and capacitor C62 for short.
37. Receiver Limiter Stage
a. GENERAL. See paragraph 18.
b. VOLTAGE CHECK. If the voltage measurement on the plate (pin No.2) produces no reading, check the primary of transformer T5 and
resistor R35 for continuity. If the voltage is
measured and found to be low, check capacitor
C63 for leakage or a short circuit. If the screen
voltage is absent on pin No. 3, check resistor
If the voltage is found .to be low check capacitor
C62 for leakage or a short circuit. A continuity
measurement should be made of the secondary
of transformer T4 and resistor R31 to ascertain
a complete grid circu it. See resistance chart for
proper ohmic value because leakage of C60 will
pr·oduce an erroneous reading and improper
operation of the limiter stage.
Table XXXI. Receive?· li1nite1· (fig. 21)
Ref
No.
C59
C60
S ignal Corps
s tock No.
Nam e of pat·t nnd dencription
Function
Part of T4
3D9100-46
CAPACITOR: fixed; 25-mmf, ±5 % , 500 vdcw.
CAPACITOR: fixed; 100-mmf, + 14'Y,; , - 6'/o , 400 vdcw.
Padder, T4 secondary
Bias resistor bypass·
V11.
'
Filament bypass, Vll.
Sc l'een g r1d bypass
Vll.
'
Plate bypass, Vll
Tuning, T5 prima~·y.
CAif'ACITOR: fixed; 0.005-mf, +80'/o , - 20 % , 300 vdcw.
CA1PACITOR: fixed; 0.005-mf, + 80 '/o , -20'/o , 300 vdcw.
C61
C62
C63
C65
Part of T5
C68
C74
R31
Part of T5
Part of T5
3Z4550
R33
3Z4534
R34
3Z4550
R35
3Z6082
T4
2Z9978-4
T5
2Z9978-5
Vll
C.AJPACITOR: fixed; 0.005-mf, +80 % , - 20'Y, , 300 vdcw.
CAPACITOR: variable; 29-mmf maximum, 6-mmf minimum, ±7'(, .
CAPACITOR: fi xed; .50-mmf, ±10 %, 500 vdcw.
CAPACITOR: fixed; 34-mmf, ±5'./o , 500 vdcw.
RESISTOR : t!xed; carbon, insulated, 100,000 ohms, ±10 % ,
1h-watt.
RESISTOR: fixed; carbon, insulated, 1-megohm, ±10 % ,
1h-watt.
RESISTOR : fixed ; carbon, insulated, 100,000 ohms, ±10 %,
1h-watt.
RESISTOR: t!xed; carbon, insu lated, 850 ohms, ±10 %,
1h-watt.
TRANSFORMER AND SHIELD: 3d i-f; includes C58,
C59, and R30.
TRANSFORMER AND SHIELD: di scriminator; includes
C65, C66, C68, C74, a nd C75.
TUBE JAN 1LN5 (VT- 179).
Coupling T5.
Padding, T5 primary
B1as, Vll.
·
I solating, Vll grid
metenng lead
Screen dropping: Vll.
B + deC·OUpling,
vn.
Interstage couplin g .
Interstage coupling.
Receiver limi ter.
41
Vll
RIVET
JAN 1 LNS (VT-179)
REC'VR
liMITER
.~---
I Ql5
I
-- ----'
21() I
I
I
I
I
() 4
I
I
I
I
I
T4 BOTTOM VIEW
I
I
HO / I
________ ___
OiJ
I
T5 BOTTOM VIEW
11--....-tl ....._
_.
c:
::!:
0
0
REC'VR
1-F AMP.
OUTPUT
POWER PLUG PIN C
POWER PLUG PIN B
1 MEG
RJJ
502
METERING
SOCKET
(LUG VIEW)
NOTE 1: Voltages are nominal DC and are measured in receive
position with a vacuum tube voltmeter b e tween point indicated
and chassis. Set connected to PE-117-(*) with fully charged
storage battery . Fresh Battery BA-41 installed and tubes in place .
VOLUME control full on . Meter switch at OPERATE. Channel
switch at A or B. Switches SW-1 and SW-2 at ON. Handset
plugged in.
v
1NF· + 82V
lNF- + 1.2V
NM - Not measured .
NC - Not connected.
NOTE 2 : Resistance values are nominal and are measured between point indicated and chassis . VOLUME control full on.
Meter switch at OPERATE. CHANNEL sw itch at A or B. Switches
SW -1 and SW-2 at ON . Handset and power cable disconnected .
All tubes and Battery BA-41 removed.
NM - Not meCJsured.
NC - Not connected.
NOTE 3 : Socket terminal used as tie or dumrr.y lug only. No
tube element connects to this lug .
TL 1902 1
Figu1·e 21. Schematic wi1·ing diagra1n limite1· stage, Radio R eceive1· and TTansmitte1· BC-659-(* ).
~.~--------~~----------~~~~--~~------~~~-------42
38. Receiver Diode Rectifier and
D-e Amplifier Discriminator
a. GENERAL. See paragraph 18.
b. RESISTANCE CHECK. The discriminator circuit can be checked more readily for component
break-down by using the resistance analysis
method. There should be a low resistance measurement between pin No.4 of V12 and pin No.
4 of Vl3. If this meas urement indicates an ·open
or high resistance circuit, the secondary of
transform er T5, the discriminator transformer,
is defective. If a dead short is indicated, capacitor C75 is defective. Measure the resistance to
ground on pin No. 7 of tube V12. If the resistance is high, resistor R37 or R38 is open. If the
resistance is low, capacitor C70 can be assun1ed
Lo be shorted or parLiaJ'Jy shorted. Measure the
resistance to ground on pin No. 6, t ube V13. If
the resistance is high, resistor Ro9 is defective.
If the resistance is l ow, capacitor C69 is shorted
or partially shorted. Check capacjtor C71 for
open or short circuit.
T able XXXJJ. R eceive?' diocle ?·ecti/iel' and cl-c ampli/ic?· (fig. 22)
R ef
No .
C66
ShuJHI Co l' p::;
stock No.
P a rt of T 5
C69
It
N am e u£ p:u·l a11tl dc:;c riplion
CAPACITOR : vari a ble ; 29-mmf, maximum, 6-mmf, maximum, ±7.0'/o .
CAPACITOR: fixed ; 0.005-mf, -1-80%, -20 % , 300 vdcw.
C70
3D9500- 16
CAPACITOR: fi xed ; 500-mmf, -1-14'/o, -G'/o, 400 vdcw.
C75
R36
en
3DA10-78
Part of T 5
3Z4534
R37
3Z6727
R38
3Z6727
R39
3Z4534
T5
2Z9978-5
CAPACITO R: fixed; 0.01-mf, ±20 % , 300 vdcw.
CAP A CIT OR: fixed; 50-mmf, ±5 '/r .
RESISTOR: fi xed; carbon, insulated, 1-megohm, ± 10'/ . ,
1;2-watt.
RESISTOR: fi xed; carbon, insulated, 270,000 ohms, ± 10 %,
1;2-watt.
RESISTOR: fi xed; carbon, insulated, 270,000 ohms, ±10 %,
1;2-watt.
RESISTOR: fixed; carbon, insulated, 1-megohm, ±10 '/o ,
~-watt.
,
TRANSFORMER AND SHIELD: discriminator includes
C65, C66, C68, C74, and C75.
TUBE J AN 1LH4 (VT - 177).
V13
•
-
} ' unction
Tuning, T5 secondary.
Control g rid audio bypass, V13.
Pre-emphasis capacitor.
Audio coupling.
Padding, T 5 secondary.
I solating, V12 grid
meter ing.
Discriminator load.
D iscrim in a tor load.
Grid, Vl3.
Inte rs lage coupling.
RC'ceiver d iode rectifier a nd d-e amplifi er .
43
TOP VIF.W OF INTERNAL
BATTERY RECEPTACLE
INTERNAL
BATTERY
PLUG
(BACK VIEW)
502
METERING
SOCkET
(LUG VIEW)
z
I
"'C?"'
h
V.
+25-
1
1-1-
:I:
::
I
.__ _ _ _ _ _ _ _ _ _ _ j
L....----l
BRN
WHT - YEL TR .
REC'VR
LIMITER
T5
OUTPU_T._---------------,
3
V14
GRID
4
5
POWER
--~~.---;-~~------------~~ PLUG
V13
JAN 1 LH9
(VT-177)
~----- - - -- - - ,
2 c() :
I ()15
I
I
I
I
I
REC'VR DIODE
RECT . & DC AMP.
:
I
Oi3
H() :
,_.__-------
PIN C
"'
1-
.005 MF
f69
6--------------~
_./
15 llOTTOM VIEW
270M n - NM
INF - + 25V NOTE 3
INF - NOTE 4
INF -
+ 1 .2V
INF - NM NOTE 3
1.54 MEG - NM
NM - NM
NOTE 1: Voltage s are nominal DC and are mea sure d in re ce ive
posit ion with a vacuum tube voltm e te r b e tw ee n point indicate d
a nd cha ss is . Set conn e cte d to PE-117-(' ) wi th fully charge d
storag e battery . Fre sh Batt e ry BA-4 1 install e d and tub e s in place .
VOLUME control full on . Me te r sw itch at OPERATE. Channel
swit(h at A or B. Switch e s SW-1 and SW -2 at ON. Handset
plugge d in .
NM - Not mea sured.
NC - Not connecte d .
NOTE 2: Resistance value s are nominal and are m e asu re d betwe en point indicate d and cha ss is. VOLUME control full on .
Me te r switch at OPERATE. CHANNEL sw it(h at A o r B. Switches
SW- 1 and SW-2 at ON . Hand se t and pow e r cabl e di sconn e cte d .
All tube s and Ba tte ry BA-41 remov e d .
NM - Not m easu red .
NC - Not conn e ct e d .
NOTE 3 : Socket ter minal used a s t ie or dummy lug only. No
t ub e e lement conne cts to thi s lug.
NOTE 4: Va lu e is SOv with ze ro volts at p in 7 of m e te rin g sock e t.
ll 19023
f •'·ir; wr e :i:.d. Sclu··otrt.tic w iri11y rlirt UI'rt ltt cl-c WII)J i ijirJr cliHcrimillctLor, H adiu H eceiver nnr.l1''nuu; JiliUe·r H C-65 9- {" ) .
44
Table XXXIII. Receive1· diode ?·ectifim· (fig. 28)
Ref
No .
C66
Si~na l
Corns
!:3tock No.
Part of T5
C69
________
::N':.am~c~of~p~a~r.:_t::an::d:._:d::e::sc:_r.:_:ip::.ti::.o::."-~-;:---;;--=-:-;--::-:-- I-----Function
CAPACITOR: variable; 29-mmf, max imum, 6-mmf, minimum, ±7.0'/f, .
300 d
CAPACITOR: fixed; 0.005-mf, +80'/'o , -20 %,
v cw.
+ 14 o/o, -6o/o,
C70
3D9500- 16
CAPACITOR: fix ed; 500-mmf,
C71
C75
R36
3DA10-78
Part of T5
324534
R37
326727
R38
326727
CAPACITOR: fi xed; 0.01-mf, ±20'/',, , 300 vdcw.
CAPACITOR: fi xed; 50-mmf, ±5'.*).
RESISTOR: fi xed ; carbon, ins ulated, 1-megohm, ±10 '/o ,
%-watt
RESISTOR:
fi xed; carbon, in sulated, 270,000 ohms, ±10 % ,
%-watt.
RESISTOR: fi xed; carbon, insulated, 270,000 ohms, ±10'/t ,
R39
3Z4534
T5
2Z9978-5
V12
%~~
.
400 vdcw.
r
Tuning, T5 seconda~y. Control g rid audio bypass, V13.
Pre-emphasis capacitor.
A udio cou piing.
Padding, T5 seco ndar y.
Isolatm g, V12 grid
metering.
Di scr imin ator load.
Discr iminator load.
Gr.id, V13.
RESISTOR: fixed; carbon, Jnsul ated, 1-megohm, ±10 !o ,
%-watt.
TRANSFORMER
AND SHIELD: discrimina tor ; in cludes
Interstage co upling.
C65, C66, C68, C74, and C75.
TUBE JAN-1R4/1294 (VT- 183 ).
Rece iver diode r ectifi er.
45
TOP VIEW OF INTERNAl
SA TTERY RECEPTACLE
~--~~~-~ -
S02
METERING
SOCKET
(LUG VIEW)
I
INTERNAl
BATTERY
PLUG
(BACK VIEW)
I
I
,.....__ ____.
I
-------------
BRN
V12
JAN 1 R4/1294 (V T-183 )
REC'VR
DIODE RECT .
REC'VR liMITER L...---~-....:W:..:.;_:H:._T_- _Y:...:E:.-::.L_T:..:.R:.:..- - - - - - - - - - - .
OUTPUT
3
~-- ---------------1 1 - -l ~------------------,
I
I
I
I
I
IO
1w
I~
I
I
I
I~
34
:MMF
1
I
I
I
r----------i 1------l
'-------- - --if---- ~ ~ -- ~ ~~- ~
2
I
4
5
V13
JAN lLH9
(VT -177 )
,-----------,
I ()l5
2 !() I
1 ()!4
1
I
I
I
I
6--------------J
I
I
I
():13
.005 MF
POWER
PLUG
PIN C
11:() :
'----------- -'
TS BOTTOM VIEW
NM - NM
on -ov
INF- + 1.2V
NOTE 1: Voltag es are nominal DC and are measure d in receive
position with a vacuum tube voltmeter bet:-"ee n point indicated
and chassis. Se t conn e cted to PE-117-( ·) with fully charged
storage batte ry. Fresh Batte ry BA-4 1 install e d and tub es in place.
VOLUME control full on. Meter switch at OPERATE . Channel
switch at A or B. Switches SW-1 and SW-2 ot ON . Hondset
plugged in .
NM - Not measured. NC - Not conne ct ed.
NM - NM
NM - NM
540M 0 - NOTE
J
NOTE 2: Resistance values are nominal and are measure d between point indicate d and chassis. VOLUME control full on .
. Meter switch at OPERATE. CHANNEL switch at A or B. Switches
SW-1 and SW-2 at ON. Handse t and power cable disconnected.
All tubes and Batte ry BA-41 removed .
NM - Not meosured .
NC - Not connected.
NOTE 3: Volue is zero volts with zero volts ot pin 7 of meter·
ing sock et.
TL 19022
F'i{f11 1'1l 2.7. Sr: hrmntic w i1·in,q rlin,qrnm ?'eceiw 1· diocle ?'ecti{ie?·, Rculio Receivm· nncl T ?·ansmittl'7' RC'-fi.?fl-(* ).
46
39. Receiver Audio-frequency Power Amplifier
CL. GENERAL. See paragraph 18.
b. VOLTAGE CHECK . If in measuring the plate
voltage on pin No. 2 no voltage is apparent,
check primary of transformer T6 for an open
circuit. If the voltage is low, checl< primary of
transformer T6 for higher resistance circuit.
There will be no trouble in obtaining proper
screen voltage as measured on pin No. 3. Check
voltage on pin No. 6. This voltage provides grid
bias to the a-f amplifier and is supplied by a
41f2-volt battery i~ the internal battery of the
~et. Check connechon on plug pin C if voltage
IS not apparent. Also check continuity of resistors R40 and R41. If •the voltage checks do not
indicate trouble that can be corrected, check the
secondary of audio transformer T6 for continuity and also continuity of voice coil on perman_ent :nagnet sp~aker SPL If headphone operatwn IS not. available from the jack provided,
check capacitor C72 for open circuit.
Table XXXIV . Receivm· a-! pow er arnJJlifie?· (fig. 2.1,.)
Ref
No .
Signa l Corp s
stocl< No .
C72
3DA10-78
C73
R40
R41
3D9040- 5
T6
V14
3Z4550
2Z9978- 6
Nam e ol part anc.l description _ __
_ __
_
CAPACITOR: fixed; 0.01-mf, ±20 %, 30() vdcw.
CAPACITOR : fixed; 0.005-mf, +14 o/o , -6 %, 300 vdcw.
POTENTIOMETER: variable; 1 megohm.
RESISTOR: fix ed; ca1·bon, insulated, 100,000 ohms, ±10 o/o ,
1/z -watt.
TRANSFORMER: output.
TUBE JAN 3D6/1299 (VT-185).
F un ction
Audio coupling to
headphones.
Aud io bypass.
Volume control.
G1·id, V14.
Audio output.
Power a-f power ampli ficr.
47
INTERNAL
BATTERY
PLUG
(BACK VIEW)
WHT- GRN TR.
V14
J2
306 1299(VT-185)
REC'VR A-F
PW'R . AMP .
WHT-Bll<. TR.
BLU
V12
CATHODE
0
w
cr:
,..:.
TOP VIEW OF INTERNAL
BATTERY RECEPTACLE
:I:
:s:
WHT-RED TR.
-~--!
V.
VEL.
I
I
I
.005 MF
169
V13 GRID
('
SW3
I
I
I
•'
NM -NM
INF-+80 V
INF· + 1.2 V
NOTE 1: Voltages are nominal DC and are measured in receive
position with a vacuum tube voltm eter between point indicated
and chassis. Set connected to PE-117-( *) with fully charged
storage battery. Fresh Batte ry BA-41 insta ll ed and tubes in place.
VOLUME control full on . Me ter switch at OPERATE . Channel
switch at A or B. Switches SW-1 and SW-2 at ON . Handset
plugged in.
NM -Not measured.
NC - Not connec.ted.
NOTE 2 : Resistance values are nominal and are measured between point indicated and chassis. VOLUME control full on.
Meter switch at OPERATE. CHANNEL switch at A or B. Switches
SW- 1 and SW-2 at ON. Handset and power cable disconnected .
All tubes and Battery BA-41 removed.
NM - Not measu red.
NC - Not connected .
F igm·e 21,. Schematic wi1-in ,q diagmm ?·eceiv e?' a1tdio-freqgency powe1· amplijie1·,
Radio Rec eive?· anrl Tmn smiUc1· BC-65.9- ( *).
TLI9024 .
(
48
40. Transmitter Reactance Modul.ator
As the first step in trouble shootmg the reactadulation it is important to find the
ance m
'
.d . N
f
presence of a-f ~oltag~ on the gr~. ' ?m o . 6. ' .~ ··
This wlll venfy the operation of. micro.
t ub e V4 .
phone transformer Tl and accompanym~ CJI"··
cuits. lf voltage is not presen~ on the gnd as
mentioned above, check operation and contacts
made by jack 1 on the microphone plug. Check
continuity of primary of tran~former Tl by
placing ohmmeter plugs on the Jack a1~d ~f tl~e
primary winding and ground: If co~tmmty 1~
measured it will show as a high resistance. If
resistance is low, continuity of the primary is
present and capacitor C29 is leaking or is short-
circuited. If trouble is not located at this point
in the test, check capacitors C25, C26, and C28
for a short circuit • Check 1·esistors Rll > Rl2
and R13 for proper value. Recheck the a-f voltage applied to the grid of tube V4. This is to be
done with a low voltage a-c electronic voltmeter.
Other circuit troubles can be located by checking the tube voltages. lf no plate voltage is
present on pin No. 2, check chol<e CH5 andresistor R8 for continuity. Also check capacitor
C24 for a short circuit. The screen voltage as
measured on pin No. 3 will be subj ect to the
same checks as the plate circui t with the except ion of the continuity check of choke CH5.
I
Table XXXV. Transmitte1· 1·eactance ?noclulato?· (fig. 25 )
R ef
No.
S igna l Co,.ps
stock No.
Function.
_ _ _ _ _ _ _N_a_m_c _or_ p al' t and dm;cri ption
C22
C24
3D9250-25
CAPACITOR: fixed; 250-mm'f ±5'/t , 300 vdcw.
CAPACITOR : fixed; 0.005-mf +80% , -20 '/o , 300 vclcw.
C25
C26
C27
3D9250-25
CAPACITOR : fi xed; 250-mmf ±5'/t , 300 vdcw.
CAPACITOR: fi xed; 15-mmf ±5r;,, 300 vclcw.
CAP A CIT OR: fixed; 500-mmf + 14 '1< , -6'k , 400 vdcw.
C28
C29
3DA1 30-1
CAPACITOR: fi xed; 0.13-mf ±20'/t , 100 vdcw .
CAPAC ITOR: electrolytic; 25-mf, - 10 '/o , +5 0'/G , 25 vdcw.
CH5
Jl
3C362-2
2Z5572
CHOKE: r -f; 120 mh at 1,000 cycles.
JACK: microphone.
R8
3Z6100-D
R9
3Z6568-2
Rll
3Z6627-1
R12
Part of T2
R13
3Z6622-2
R44
R46
3Z6005A6
Tl
V4
2ZD666A
RESISTOR: fixed; carbon, insu lated, 1,000 ohms
%-watt.
RESISTOR: fi xed; carbon, insulated, 6,800 ohm s
lfz -watt.
RESISTOR: ftxed ; carbon, insulated, 27,000 ohms
lfz-watt.
RESISTOR : fixed; carbon , insulated, 470,000 ohms
lfz -watt.
RES I STOR: fixed; carbon, in sulated, 22,000 ohms
l/z-watt.
RESISTOR: fixed; mold ed wi r e wound; 56 ohms,
RESISTOR: fixed; ca rb on, insulated, 180 ohms,
l/z-watt.
T RANSFORMER: mi croph011e.
TUBE JAN 3D6/ 129!) (VT- 185).
3D9500-16
± 10'/G ,
Co upling V4 to V3.
Screen grid bypass
V4.
Blocking capacitor.
\Phase shifting, V4.
Discriminator load bypass.
Audio bypass, Tl.
Micl"OlJhone current
Ft lter.
Plate, V4.
Microp hone plug receptacle.
B + dropping, V4.
± 10'/t ,
Osci llator modulator
phase shift.
Control grid coupling,
V4.
Voltage divider, Tl.
± ] 0'/t ,
Voltage div ider, Tl.
± J 0'/t .
±10',1, ,
Filament equal izing.
F il ament equalizing.
± J 0'/t ,
± 10 '/t,
Microphone input.
Transmitter r eactance
modulator.
49
TRANS. REACT.
MOD. OUTPUT
V4
JAt:J 306/1299 (VT-185)
----.---~. TRANS . REACT.
c:
Jl
~
N
0
"' ....v
Rll
c:
27 Mn
~
M
"'
N
N
z
"'
~
L5 PIN No. 2
15
R9
56
MMF
.n
1"
I" 1"
R44
POWER PLUG
PIN B
.13
MF
!
POWER
PLUG
PIN F
POWER
PLUG
PING
TOP VIEW OF INTERNAL
BATTERY RECEPTACLE
~--~~~-, I
I
I
I
----1
~
N
-v
"'
I
I
I
I
"'
1-:
w
~
z
"'"'
I~
1-
I
INTERNAL
BATTERY
PLUG
(BACK VIE...,.
~
NOTE I : Voltag e s are nominal DC and are measu re d in transmit
position with a vacuum tub e voltm e te r betwee n point indicat e d
and chassis. Se t conn e cte d to PE-117 -( ") with fully charg e d
storag e batt e ry . Fresh Batte ry BA-41 in stall e d a nd tub e s in plac e.
VOLUME control full on . Mete r switch at OPERATE. Channel
switch at A or B. Switches SW -1 and SW-2 at ON. Handset
plugg ed in and push -to -tal k switch in " talk " po sit ion .
INF -+ SOV
INF -+ 82V
INF·NM
INF -+ 3 .1V
NM - NM
NOTE 2: Res istance vcolu es are nominal ond a re me a sured b etwee n point indicat e d and cha ss is. VOLUME control full on .
Me ie r swilch at OPERATE . CHANNEL sw ilch a l A or B. Sw itch es
SW -1 and SW -2 al ON . Ha nd se t a nd po wer wbl e di sconn ect e d .
All tub es and Batl er y BA -4 1 re mov e d.
NM - Not mea sure d .
NC - Not conn ecte d .
NOTE 3 : Socke t ter minal use d a s ti e or dummy lug only. No
tub e e le me nt conn e ct s to thi s lug .
TL 19025
F i gun; 25. Schenw tic ~vi?'ing diagmm tm?tsmitier 'l."e actc~nce modulato1·,
Rctdio R ecewer a1ul T ranslllttter BC-v59-(") .
50
41. Transmitter Oscillato~
. . .
Measure the voltage on pm No. 6. If It Is found
to be positive, check capacitor C22 for a short
circuit. If voltage on pin No. 6 is not negative
as proper operation would indicate, check resistor R7 for continuity, and check capacitor
C18 for either a short or open circuit. Trouble
in these components prevents oscillation. If os-
cillation is indicated but is weak, check s~~i
SW8 and capacitor C21 for an open or sho
circuit. Coil L5 should have continuity and 1 sistance value as indicated in table XXI. I:f
plate voltage is mcasuTed on pin No. 2, che
choke CH3 for continuity. The screen voltage
measured on pin No. 3 is directly connected
B+ .
Tctble XXXV I. TmnsmitteT oscillat01· (fig. 2u)
Ref
No.
C16
C17
Signa l CorpH
3D9250-24
C18
C19
3D9050-35
3D9100V-4
C20
C21
C23
3D9100V-5
Part of L5
CH3
CH4
L5
R6
3C3G2-2
3C362-1
2C5379 ( )/C2
3Z4534
R7
3ZG627-l
R45
SW8
V3
•
Name of par·t nnU tlescl'iption
stock No.
- - - -- - - - - - - CAPACI
TOR: fixed;
Note 1
--- - -
250-mmf, + 14 %, -6'/o , 400 vdcw.
CAPACITOR: fix d; O.OOG-mf, +80 %, -20'1< , 300
vdcw.
CAPACITOR: fixed; 50-mmf, + 14'/t , -6'1< , 400 vtlcw.
CAPACITOH.: variable; 100-mmf, maximum, 5.0-mm(
minimum.
CAPACITOR : variable; 100-mmf maximum.
CAIP A CIT OR: fixed; 40-mmf, ±2'/t .
CAPACITOR: fixed; 0.005-mf, ±80 '/o , -20 % , 300
vdcw.
CHOKE: r-f; 120 mh at 1,000 cycles.
CHOKE: low r-f; 5.58 mh at 4 me.
COIL AND SHIELD: transmitter osc illator.
RESISTOR: fixed; carbon, insu lated, J-megohm, ± 10';( ,
1!2-watt.•
RESISTOR: fixed; carbon, insulated, 27,000 ohms,
±10 7r , 1h-watt.
RESISTOR: fixed; molded wire wound, 220 ohm ,
±10';( .
SWITCH: channel changing.
TUBE JAN 3DG/ 1299 (VT- 185).
• Switch SW8 i s part. of channel chang ing ~ w i tch ~ZH:i ll
1.
- --
-·
Function
Cou1Jli ng V3 to V2
Screen grid bypa'S
V3.
Grid leak bypass v
Tuning LG, ·hann' 1 B:
Tuning L5, channel A.
Padding, L5.
- •
Microphone switch filte r.
Plate, V3.
Filament, V3.
Grid , V3.
I solating, V3 grid mei e ring lead .
Bia s, V3.
Filament equalizing.
Grid, V3.
T r ansmitter oscillator.
51
V3
JAN 306/1299 (VT-185)
TRANS. OSC .
TRANS. OSC.
OUTPUT
250 MMF
V4
r-""'VVV'W-..-----~~----~t------+--1 L...._PIN No. 2
R7
4
,. -27,0000
C21
1.14 mh
100 MMF
100 MMF
POWER PLUG
PING
40MMF
C17
!'oos
MF
R44
C23
.005
MF~
NOTE: - CHANNEL SWITCH SW8
SHOWN IN CHANNEL '8' POSITION.
POWER PLUG
PIN 8
r-CQJ------~I
S02
I
METERING
SOCKET
(LUG VIEW)
II
I
I
I
03
2
I
4
I
1
I
I
I
-------LS BOTTOM VIEW
INF -
+aov
INF-+80V
+ SOV
INF - NM
INF - +3.1V
NM - NM
INF-
NOTE 3
NOT~ 1: ~oltoges ore nominal DC and are measured in transmit
posotoon woth a vacuum tube voltm e te r betwee n point indicated
and chassis. Se t connected to PE-117-(*) with fully charged
storage battery. Fresh Batte ry BA-41 instdlled and tub es in place.
VOLUME control full on. Meter switch at OPERATE. Channel
~witch at. A or B. Switches SW-1 and SW-2 at ON. Handset
plugge~ on and push-to-talk switch in "talk" position.
NOTE 2 : Resistance values are nom inal and are measured between point indicate d and chassis. VOLUME control full on .
Meter switch at OPERATE. CHANNEL sw itch at A or B. Switches
SW·1 and SW -2 at ON . Hand set and power cable disconnected.
All tubes and Batter y BA-41 rem oved.
NM - Not measure d .
NC - Not conn e cted.
NOTE 3 : Sock e t te rminal use d as tie or dummy lug only . No
tub e e le me nt connects to this lug .
TLI9026
Fiuu1·e 26. Sc hematic wi1·inu diag1·am tmnsmittGr oscillator, Radio Receiver and Tmnsmitte1· BC-659-(*).
52
42. Transmitter Buffer
.
Measure the voltage ·on the gnd of the tran~­
mi tter buffer (pin No. 3 or 6) . If 1the voltage ·I S
fo und to be positive, check capacitor C16 for a
short circuit. Measure the voltage of the plate
circuit pin No. 2 or 7. If no voltage is present,
check choke CH2 for continuity. If an electronic
a-c voltmeter designed for t he measurement of
rad io frequencies is available, determine
whether or not a-c voltage is present between
the plate of the buffer tube and gro und. If a-c
voltage is present, swing variable capacitor C12
or C13 depending on channel used to determine
the opel'ation of the grid tube circuits. Checl~
capacitor C14, C15, C13, and C12 for a short
circuit, if tuning cannot be accomplished. Thl:l
continuity o:f coil L4 should be checked also. H
grid voltage, as measured on pin No. 3 of t hl:l
buffer, tube or at pin 5 on the metering socket
is not of the proper valu e as indicated on th~
voltage chart check resistor R4 for proper value.
Tab le XXXV II. T mnsm:ittm· buf]e1· (fig. 27 )
R ef
No.
Sig-na l Corps
stock No.
Name of pn1·t and des criptio n
-------
C9
Cll
3DA1-48
C12
C13
C14
C15
CH2
L4
R3
3D9050V-29
3D9050V-30
3D9020-3
3C362-2
2C5379 ( ) / Cl
3Z6005AG
CAPACITOR : fixed; 0.001-mf, + 14'/o , -6'/o , 300 vdcw.
CAPACITOR : fixed; 0.005-mf, + 80'/o , -20'/r , 300
vdcw.
CAPACITOR: variable; 50-mmf, maximum.
CAPACITOR : variable; 50-mmf, maximum.
CAPACITOR: fixed; 20-mmf, ±5'/r .
CAPACITOR: fixed; 20-mmf, ±5 '/r .
CHOKE : radio frequency; 120 mh at 1,000 cycles.
COIL AND SHIELD: buffer gT icl.
RESISTOR: fixed; 56-ohm s ±10'/o .
R4
H.5
3Z6622- 2
3Z4534
RESISTOR: fi xed; 22,000 ohms, ±10 %.
RESISTOR: fixed ; 1-megohm, ±10 %.
R17
SWl
3Z6620-11
3Z9859-17
RESISTOR: fi xed; 20,000 ohms, ±5 '/o .
SWITCH: .toggle.
SW7
SWITCH: channel.
V2
TUBE JAN 3B7/ 1291 (VT- 182).
Functio11
Coup ling V8 to Vl.
F il ament bypass.
Tuning i4, cha nn el B.
Tun ing L4, chann el A.
Paclder , T 3 primary.
Padding, L4.
Plate, V G.
Grid, V2.
Filam nt equalizi ng
V2.
'
B ias, V2.
Isolating, V2 gr id meteri ng lead.
Meter mu ltip li er.
Opens B + lead - to
Vl a nd V2.
Channel changing V2
grid .
T1·ansm itter bufl'er.
53
V2
JAN 387 /1291( VT-182)
TRANS . BUFFER
C16
TRANS. BUFFER
OUTPUT
.-----------------~~----------~~------~----I~VJ
PIN
.------- No. 2
250 MMF
1.14 mh
:-~-ci--'i
I
1
I
I
YEl
R44
22,ooo n
~-- - -- ---- ... '
NOTE: - CHANNEL SWITCH
SW 7 SHOWN IN
CHANNEL B PO SITION
l4 BOTTOM VIEW
:I:os
R4
MF
M1
BlK .
RED
S02
METERING
SOCKET
(LUG VIEW)
c:
METER SW ITCH
(REAR VIEW)
0
0
0
6
"'
'SWITCH lEGEND
0 - OPERATE
C - CHECK
F- FILAMENT
p - PlATE
RED - BLU TR.
POWER PlUG
PIN E
22M O NM
INF -
+
120V
INF -+ 4 .4V
NM - NM
22M O NM
INF · + 120V
NOTE 1 : Vohage s are nominal DC and are m e asure d in tran smit
po silion wilh a vacuum lub e vollm e le r b e lwee n poinl indicat e d
and cha ss is. Se l conn e cl e d to PE -117-( ·) with fully charg e d
slo rag e batt e ry . Fres h Batt e ry BA-41 inslallcd and lub e s in place .
VOlUME conlrol fu ll on . Me ie r sw ilch al OPERATE . Chann e l
sw ilch al A or B. Sw it ches SW -1 and SW -2 al ON Handse l
plugg e d in and pu sh-lo -ta lk sw itch in " lal k" po silion .
NOTE 2 : Res istance valu es o re nomin a l and are m e asu re d b elw ee n poinl indical e d and cha ss is. VOlUME control full on .
Me te r s witch at OPERATE. CHANNEL switch at A or B. Switch es
SW-1 and SW -2 al ON . Hand se t and pow er cabl e disconn e ct e d .
All tub e s and Batt ery BA-41 re mov e d .
NM - Not m e a sur e d .
NC - Not conn e cte d .
TL 1902 7
Figm ·e 27. Sc henwtic wi1·ing diagmm trcms[onne1· b t~ff e1·, Rad:io Receive1· ancl Transmitter BC- 659-(* ) .
54
43. Transmitter R-f Power Amplifier
Determine whether or not capacitor C4 or C5
is shorted. Measure the voltage on grids of tube
Vl (pin No. 3 and 6). If voltage is measured
and found to be positive, check C9 for short circuit. With rt:he proper operation of the transmitter buffer, the grid voltage should be as indicated on the tube voltage chart. If not, check
resistor Rl, R2, and capacitor ClO for ·open and
short circuits. The plate voltage should be present on pin No. 2 and 7. If no plate voltage is
present, check capacitor CI-Il and resistor R16
for open circuit conditions. Also check coil L2
for open circuit. If the antenna terminal has a
positive voltage, capacitor Cl is shorted. If the
final power amplirier does not draw the propel'
current, check all tuning capacitors and induct~
ances for trouble. If the r-f voltage supplied to
the antenna is unusually low and other circuit
constants are normal, check capacitor C30 for
leakage. This capacitor would produce a loading
effect and severely attenuate the output r-f
signal.
Table XXXVIII. Tmnsfonner r -f 1Jowe1· amplifie1· (fig . 28 )
R C
No .
Sig-na l Corps
stock No.
Name of part and desct·iption
----------------------------------------CAPACITOR : fixed; 10-mmf, ±5 %, 300 vdcw.
C1
C2
C3
C4
C5
CG
C'f
C8
ClO
3D9010-B
3D9035V- 4
3D9035V- 2
3D9001V
C30
3D9050- 36
CAP A CIT OR: fixed; 50-mmf. ±5 nf<,, 300 vdcw.
CH1
L1
L2
L3
R1
R2
SW2
SW5
3C362-1
3C1078
3C1082
CHOKE: low r-f; 5.58 mh at 4 me.
COIL: antenna loading:
CO IL: p-a plate.
COIL AND GRID : p-a grid.
RESISTOR: fi xed; 2,700 ohms, ±10 % , lh-watt.
RESISTOR: fixed, 100 ohms, ±5 % , %-watt.
SWITCH: toggle.
SWITCH : channel.
3ZG270
3Z6010-39
3Z8311-1
CAPACITOR:
CAIP A CIT OR:
CAP A CIT OR:
CAPACITOR :
CAPACITOR:
CA:PACITOR:
CAP A CIT OR:
CAPACITOR:
variable; 35-mmf, maximum.
variable; 35-mmf, maximum.
variable; 1.0- to 3.5-mmf.
variable; 1.0- to 3.5-mmf.
fixed; 0.005-mf, + 80 '/o , -20 % , 300 vdcw.
variable; 35-mmf, maximum.
variable; 35-mrnf, maximum.
fi xed; 0.005-m.f, +80 %, -20 % , 300 vdcw.
SW6
SWITCH: channel.
V1
TUBE JAN 3B7 /1291 (VT-182 ).
Function
--~ ----Coupling
Ll to L2.
Tuning L2, channell3.
Tuning L2, channel .A...
Neutralizing, Vl.
Neutralizing, Vl.
B + bypass, Vl.
Tuning L3, channell3.
Tuning L3, channel .A...
Bias resistor bypass,
Vl.
Receiver antenna coupling.
Plate, Vl.
Antenna loading .
Plate. V1.
Grid, Vl.
Bias, Vl.
Meter shunt.
Alignment, Vl plate.
Channel changing, Vl
plate.
Channel changing, Vl
grid.
Transm itter, r-f power
amplifier.
55
V1
JAN 387/1291 (VT-182)
TRANS . R-F POWER AMP
V2
PIN No.2
C4
35
MMF
2
3
35
MMF
35
MMF
.....
w
>-
C5
3.5 MMF
R3
C10
NOTE: -· CHANNEL SWITCH
SWS AND SW6
SHOWN IN CHANNEL
B POSITION
.oosi
;:)
.....
a:l
R15
POWER
PLUG PIN F
M1
C6
IX
I-
R1
MF
2.2.0.
-
2,700 ()
lOOn
RED
BLK .
.oo53
MF6
-
w
IX
.--t--.1\
RED - BLU TR .
Cl
.....
MET ER SWITC H
(R EA R VIEW )
IX
SW1~F
1
0
POWER
PLUG
PINE
0
0
a'
N
SWITCH LEGEND
0
C
F
p
-
OP ERATE
CHE CK
FIL AMENT
PLATE
ll BOTTOM VIEW
NM - NM
+ 1 1 SV
3 - + 6 .0 V
INF N O TE
2800 Q-NM
INF - +. 115V
l2 BOTTOM VIEW
L3 BOTTOM VIEW
NOTE 1: Voltages are nominal DC and are measured in tran s mit
position with a vacuum tube voltmeter betwee n point indicated
and chassis . Set conn e cted to PE-117 · ( ·) w ith fully charged
storage batte ry. Fres h Battery BA-41 install e d and t u bes in place .
VOLUME contro l full on. Meter switch at OPERATE. Channel
switch at A or B. Switches SW-1 and SW-2 at ON . Handset
plugg e d in and push -to -talk switch in "talk" position .
NOTE 2: Re sistance valu es are nominal and are m e asured between po in t indicated and chassis. VOLUME control full on.
Me ter switch at OPERATE . CHANNEL switch at A or B. Switches
SW-1 and SW-2 at ON . Handse t and power cable disconnected.
All tubes and Batte ry BA-4 1 removed.
NM - Not measured .
NC - Not connecte d.
NOTE 3: Value depe nds upon leakage through C29, but should
be 1 MEG minimum .
Tl 19Q2R
Figure 28. SchCr~U£tic wiring diagmm tmnsmitte?· ?"-f powe1· amplifier,
R adio Receive?· and Tmnsmiite?· BC- Ii 5!i-( * ) .
56
DETAIL NO -69C .36088
POWER 8. CONTROL
• CABLE PLUG
TO POWER 6 CONTROL
PLUG P2
(PIN 'C'l
TO IN TERNAL
TO POWER 8
CONTROL PLUG
P
2
(PIN'D'l
TO
TO POWER 8 CO NTROL
GR
PLUG P
2
(PIN 'A')
'fQ
WIRING DIAGRAM R 40 VOLUME CONTROL
8. SW3 8. SW 4 SWITCHES.
( VI~WED FROM REAR )
~UNCTION
OF
R1 6
R2
REO- OLU TR SW
WIRING DIAGRAM, SW 13 METER SWITQ!.
{VIEWED FROM REAR )
Fi_qw·e 2.9 . ComJJOnent JJCI!I'ts bottom of dwssis, Raclio Receive?· nnd TmnsmiUcJ· BC'-G5.'J-( *),
{:( U.S. GO VCRNM CNT PR IN TING
orrtcr:
1945- 628 128-
TM·IG7
4
TO Sl'l2
TL.19029
NOTES
'M1
B~K .
......
._
,J,
1
:e'
I )o
1:..
\MF
3w.
"o~
: ov
)o lLS
2
I.
~
I
~1-.i
0
Tc24
6,soo
';?"
.005
•ill
MF~
--
6
... ::E
-:<
Rll
~25
""
L..----o
56,!l
R44
c:
::E
-
....~..
.13
15
MMF
••
?'
~
.:F
0
~· ~
1"
SW ITCH LEGEND
0 - OPERAT E
C - CHECK
F - FILAMENT
P - PLATE
Llc
"'~=~
H~
· SW13 ,.r
WHT- BRN TR.
p •·
£~
. 1-
Cl-
"'R-::--:oct
7
o
;J:~
~ lc:
·"'<
RED
""- 6
r-..ro
2
4
L~G
I
'C>
+
POSITIONING
......._r-.....r--....
WHT
1
~ ~
~ ~
Tc27
c:
M
~.0- MMF
2~~
:
.Jj.ooMMf
0
"" "..,
27MCl
~ C: ~~
n
~
C23
Q
TRANS. REACT .
MOD.
Eo~
T1
3
JAN 306/1299 (VT-185)
..,,.-
C22
METER SWITCH
<RE AR VIEW)
\14
I
'250 MMF
-
c:
0
~?g
)>~
3
~"JY
502
METERING
soct<ET
~~ ·
(LUG VI EW)
POWER & CONT.
CABLE PLUG
~~
GRN
C29
f2a
-:1.
'T
"<~~r-
..L
-
r
--~~fO~
aL.
C:'F As~'
J=t-J~-~-------t---r--------t---------------------~O~R~.
L---~--·=~
---=---------_.._______________________________
.,. ______________W;-;;;::-::::-----l-
RED - BLU Tn . . SWl
'"'o-----i-li---J....I-.-·L ..J------l...+Cl-:---t-------t-----..~1
~ ~~
TOP VIEW OF INTERNAL
f
---------------------~------------------------------------------------------------~R~F.O~-~~~~l'P. _______ ·4-·--t=~~~~-~-11~~~----_-_-_-_-t1----t--------------------+-+----1J-~-t------~~-r~~--_J
-
~-=r.,~-lU_T_R_.
_-_-________________________________________________,.~~~:L
----------~=---------------------------------~~-Q_.__--~---------------------~
- - --
_-_-_-_
- _-_-_
- _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-....
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
· - · -(> - - - · - -
----------------------------------=:--+--------·- -----------·--·-ti_-=_-=_-=_-=______________~R~2~3-'V'I.IW~l~M~E~G~--:--·_J
V9
VlO
JAN· 1LR~~.~:-l 79)
JAN llN5 (VT-179)
REC'VR
WHT - ORG TR.
Vll
JAN HNS (VT-179)
REC'VR
J.f AMP.
~
1
JAN
1R4/1294~~~-183)
..
~ i~r~ ~- ~- -~ -i~- - _-l....~~~--:::.p::-' r--~~--~~:~. -~.- - - .J:- - -i,-~- -l- ~.:;. '~" '[.;t---~~1~1-t--1:f·o~ r{~: 'i-;,i- -;.;~-----!~! ~.~ - -~:~- -,c~-:- -_-_-:.,·?=\ ' ;~"'
~:~~--~~~·_: ,__.1-- -..-~~ ~~~!----··t=>·----~~·_j . ~·•• _L_c.a~_r -_-_~_,~_~_,. .:~. .,~ ~- J~~~ !f5 ~ ~·L_ i;~:r 'j~, (1 ~ ,.~,.., :;,..,i! .-w;; r~ -~':.
WHT
2
-
CS2 -
-=:_=-
R28
·~;
-:§
-~;
J.
R,~9
...,
:
,6_ _._-=_.Cf7._
......
•~
__
-~: ~ -~:
~
:~~K-.-.__.1111,--. :
-~:OO MMF -~:
- 0,.
~~ so~
-
:
·~: ~ i~-(.6~--i----t ._ _____c~!l_-=; b---------j r------l
~ ~~
~ ,'
SW3
.. !
1
x
4
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C52,C53,C61,C63, AND C69.
Figu1·e 90. Schenwtic wi1-ing diagram, Radio Receive?· and TmnS?nitte?· BC-659-A, -B, and -H.
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