Henry Radio TEMPO one Transceiver, TEMPO AC/one, DC/one Power Supply INSTRUCTION MANUAL

INSTRUCTION
MANUAL
TEMPO one
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HENRY RADIO STANDARD WARRANTY
Henry Radio warrants each new radio product manufactured by it to be free from defective material and
workmanship and agrees to remedy any such defect or to furnish a new part in exchange for any part of
any unit of its manufacture which under normal installation, use, and service discloses such defect, provided
the unit is delivered by the owner to us intact, for our examination, with all transportation charges prepaid
to our factory, within ninety days from the date of sale to original purchaser and provided that such
examination discloses in our judgment that 1t is thus defective. Should a malfunction be suspected, write
in detail to our Service Department for suggestions concerning the operation, repair, or return of your unit
if it should prove necessary.
This warranty does not extend to any of our radio products which have been subjected to misuse, neglect,
accident, incorrect wiring not our own, improper installation, or to use in violation of instructions
furnished by us, nor does it extend to units which have been repaired or altered outside our factory, nor in
cases where the serial number there of has been removed, defaced, or changed, nor to units used with acces-
sories not manufactured or recommended by us.
Any part of a unit approved for remedy or exchange hereunder will be remedied or exchanged by Henry
Radio without charge to the owner.
This warranty is in lieu of all other warranties expressed or implied and no representative or person is
authorized to assume for us any other liability in connection with the sale of our radio products.
Henry Radio reserves the right to make any improvements to its products which it may deem desirable
without obligation to install such improvements in its previously manufactured products.
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RECEIVER TRANSMITTER COMMON ( ) OPTION
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TEMPO one SSB TRANSCEIVER
The TEMPO one Transceiver. for HF amateur bands 80 through 10 meters, is a
precision built high performance transceiver providing SSB (USB and LSB selectable), CW
and AM modes of operation, with a single-tone power of 240W (approx. 300W speech peak
input). |
High stability 18 obtained by use of a well designed heterodyne VFO, and the specially
designed 9 MC crystal filter ensures good voice quality.
lts compact size, light weight, and attached carrying handle make it very suitable and
convenient for both home, portable, and mobile use.
Other features include VOX, 100 ke calibrator, +5 ke receiver offset (clarifier) tuning and
easy connection for use of a Linear Amplifier.
TEMPO/AC one matching AC power supply with built-in speaker is especially designed
for use with the Transceiver, A 12V DC supply; the TEMPO DC/one provides for mobile
or field use.
Modes
Input power
Frequency range
Antenna impedance
Frequency stability
Carrier suppression
Sideband suppression
Third order intermodulation
products
A.F. bandwidth
Receiver sensitivity
Selectivity
[.F. interference ratio
Image ratio
Audio output
Audio output impedance
Power supply
Tubes & semiconductors
Dimensions
Weight
GENERAL SPECIFICATIONS
SSB (USB—LSB), CW, AM
240W
3.5.4; 7- 7.5; 14--14.5; 21—21.5; 28.5—29,
(crystals optionally available for ranges 28—28.5; 29—29.5;
29.5—30 MC)
50-100 ohms
After warm-up, within 100 cps/ every 30 minutes
—40 dB
—50 dB at 1000 cps
—30 dB (P.E.P.)
300—2700 cps
0.5 uV input S/N 10 dB
2.4 kc (—6 dB), 4 ke (+60 dB)
50 dB
50 dB
IW at 10% distortion
8 ohms
AC or DC with separate power supplies
16 tubes, 15 diodes, 7 transistors
13%” wide, 5%” high, 11” deep
17.5 Ibs. (8kg)
TEMPO AC/one SPECIFICATIONS
Semiconductors 9 diodes
Dimensions 8” wide, 5%” high, 117 deep
Weight | Approx. 22 lbs. (10kg)
Speaker (built-in) 5” x 3”, 8 ohms —
Supply voltage 100V/110V/117V/200V/220V/234V 50 60 cps
TEMPO DC/one SPECIFICATIONS
Matching DC power supply
Semiconductors 4 transistors, 9 diodes
Dimensions 8” wide, 2%” high, 87%s” deep
Weight Approx. 6.6 Ibs. (3kg)
Power source DC-12V, 12.5A (receive), ISA (transmit), 27A (transmit
100W peak)
CIRCUIT DESCRIPTION
It can be seen from the block diagram that many sections are common for both receiving
and transmitting. For an easier understanding of the operation, the receiving and trans-
mitting sections will be described separately.
Receiving Section
Signal from ANT terminal passes through antenna RX/TX relay to ANT input tuned circuit
to grid | of RF amplifier tube V2, 6BZ6. Signal is amplified and through the next tuned
circuit on the grid of receiver mixer tube V1, 6U8, pentode section. Local oscillator signal
is applied to cathode of this mixer and the I.F. signal appears at mixer plate. The LF. signal
then passes through the 9 MC crystal filter to the two stage amplifier V 104, 6BAG, V 103,
6BZ6 and thence to V102A, %412AX7 power grid detector. This detector acts as a product
detector, with BFO signal applied to its cathode, when receiving CW and SSB. V102B,
A12AX7 functions as an anode detection type amplifier of AGC. With no signal applied,
plate current is zero with plate voltage zero. When signal is applied, plate current develops,
resulting in a negative plate voltage which is applied through diode D103 to AGC line.
Circuit provides suitable AGC characteristics of fast attack, slow decay for SSB and CW.
Internal resistance of diode is low in forward direction and high in reverse direction. AGC
voltage is applied to RF and IF stages so that a wide range of signal levels can be handled.
Detector output is fed to silicon diodes D101, D102, ANL, then via AF gain control,
through 6BM8 AF output tube to speaker or headphones.
Transmitting Section
Output of carrier oscillator V106, 12AU7 is injected to first grid of V107, 7360 balanced
modulator and audio signal from mic. Amp. to modulating grid of BM. Suppressed carrier
DSB 1s developed at plate of BM. Tis signai then passes through the crystal filter XF101,
which eliminates one sideband. thus resulting in a SSB signal, 9 MC.
For AM transmission (sideband with carrier insertion) the BM becomes unbalanced because
of swifching circuitry, permitting carrier to pass through, and also carrier frequency is
shifted by means of a varicap diode circuit so that carrier passes freely through filter pass-
band. Amount ‘of carrier insertion level is adjustable by AM carrier control VRS.
For CW transmission, audio is disabled. and similarly as for AM, the BM is unbalanced and
carrier frequency shifted to allow tull carrier to pass through filter.
In the TUNE condition, a 1500 cps signal from the audio tone oscillator TR503 is applied
to the BM. This provides a convenient tuning signal near filter center frequency. Level of
signal is controlled by mic. gain control.
The 9 MC signal, after passing through the “ier, is amplified by IF amplifier tube V104,
GBAG. thence to grid of mixer tube V4, 6EJ7, together with local oscillator signal. The
resultant difference between these two frequencies appears at plate tuned circuit of mixer
and is the transmitting ham band cutput signal frequency. On 14 MC band, additive mixing
IS used.
This signal is amplified by V5. 12BY7 tuned driver and finally to power amplifier tubes
V6/V7, 2 x 6JS6A, and antenna. Power amplifier V6/V7 operates in class A B2 for maximum
power output.
The AC audio component of PA grid current, when overdriven by signal peaks, is rectified
by diodes D4/D5 to provide an ALC (Automatic Level Control) voltage to the IF amp. stage
thus reducing its gain and maintaining low distortion.
The PA Pi network plate circuit provides attenuation to the higher order harmonics and
enables easy, flexible adjustment of impedance matching to antenna feedline.
On phone, PTT and VOX control is available. On VOX, a sample of signal from microphone
is applied to grid of V8 and then to V9A. rectified by diode D2, SH-1, producing a positive
bias on the grid of V9B relay tube, causing plate current to flow and relay to actuate.
On CW, “straight” or “break-in” keying methods are available. Break-in is produced by keying
audio oscillator tone applied to VOX amp. as well as transmitter bias line. The relay
switches bias on V107, V4, V5. V6 and V7.
Tone signal also can be heard from speaker while keying, thus providing sidetone monitoring.
OSCILLATOR CIRCUITS
In the TEMPO one crystal oscillators are used for carrier generation and the bandswitched
heterodyne oscillator, together with a self-controlled oscillator for VFO, which is at a
frequency low enough to obtain good stability. Other oscillators included are 100 kc crystal
calibrator and audio tone oscillator. An exteral VFO model TEMPO VF/one is available
to provide additional operational flexibility and split frequency operation.
Carrier crystal oscillator
V106, 12AU7 double triode with crystals 8998.5 kc and 9001.5 kc, one in each triode
section. With sideband selector switch at NORMAL, carrier crystal 8998.5 is operative
for 7 and 14 MC band and 9001.5 for 3.5, 21 and 28 MC. When the selector switch is
in REVERSE position, then the carrier crystal oscillator sections are changed.
Carrier oscillator operates like the BFO when in receive mode.
On AM & CW, crystal 9001.5 is used and its frequency is lowered 200 cps by diode
switch D104, 1S1007, bringing carrier into filter passband.
Bandswitched heterodyne oscillator
This is a crystal oscillator using silicon type 2SC372 transistor, and it is operative on bands
7, 21 and 28 MC. 10 M band crystal is included for 28.5—29 MC, and positions are
available for other three optional ranges for full coverage of 10 M.
VFO self-oscillator
The VFO is a transistorized Colpitts circuit with 2SC372 oscillator and 2SC372 buffer. It
has linear tuning over the range 5 — 5.5 MC. A passband filter circuit at output is tuned to
pass the 5 — 5.5 MC range. Varicap diode D401, 1S145 permits receiver off-set tuning con-
trol ¥5 kc on receiving.
Crystal calibrator oscillator
Transistor oscillator 2SC367 with 100 kc crystal, and diode type 1S1007 harmonic
generator provides accurate check points every 100 kc on main dial.
AF oscillator
The phase shift type with 2SC372 transistor, generating audio tone signal at 1500 cps, sup-
plies transmitter tune-up signal and CW sidetone monitoring. This oscillator also actuates
VOX relays for semi-automatic break-in CW operation.
LOCAL OSCILLATOR MIXER CIRCUIT
VFO output is applied to grid 1 of V3, 6CB6 mixer and heterodyne oscillator output to
cathode. Resultant beat frequency is selected in plate tuned circuit.
METER CIRCUIT
Meter 1$ 1 mA movement, and it is connected to 2nd IF stage to read change in cathode
voltage of У 103, resulting from variations of AGC voltage, to indicate receiver ““S” units.
Meter is automatically switched by relay RL101, on transmitting, to indicate relative power
output (PO) PA cathode current (IC) and ALC voltage. Meter scale is fully calibrated, and
transmitter metering functions PO, IC and ALC, are selected by panel mounted slide switch.
VOLTAGE REGULATOR CIRCUIT
The voltage regulator circuit, mounted on a print board, provides 9 volts for all transistor
oscillators. Two transistors are used, 2SC372 and 2SC367, together with two zener diodes,
18331 and 18336, and voltage level can be set by adjustment of variable resistor V R5O1.
SSB TRANSCEIVER
CLARIFIER
CW hmm UA ë
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AA RF GAIN @ AF GAIN
TUNE PULL ANL ON
558, RA
1. Phones
2. Mic.
3. Function
4A. AF Gain, Pull-ANL-On
4B. RF Gain
5. VFO
6. Cal
7 & 8. Band
9. Oper-RecCal
10. (Receiver off-set-tuning)
Headphone socket. Impedance 600 ohms.
When plug is inserted into socket, speaker is automatically
disconnected.
Microphone socket. Standard 44” 3 contact T.R.S. type. High
impedance. Tip relay control. Ring microphone audio. Sleeve
ground.
Function switch.
OFF AC power removed from power supply.
SSB Selects SSB operation.
TUNE Places TX in tune-up condition.
Cw Selects CW operation.
AM Selects AM operation.
Knob
Level control
Control knob and vernier drive.
One revolution of knob covers approx. 15 kc. Upper windows
give 50 kc points with O—500 markings. The vernier scale is
marked in 1 kc steps, 0—100.
This is a locking knob used to set dial calibration in conjunction
with the 100 kc calibrator. With transceiver in receiving con-
dition, the vernier dial is turned to “O” and locked by a half
turn of the CAL locking knob. 100 kc calibrator is switched
on with control No. 9. Then the VFO knob is rotated to a 100
kc point so that calibrator beat note is heard. It is then adjusted
for zero beat. Locking knob is then released.
Bandswitch, marked for bands in MC. Red colors indicate that
red scale is to be used on VFO dial. The various 28 MC ranges
are selected by knob No. 8 when No. 7 1s at its full clock-
wise position.
Lever switch. Selects functions of calibrator receiving and
transmitter operation.
Clarifier adjustment. It provides +5 kc variation of receiver tun-
ing (“off-set-tuning”). When switched to OFF, the receiving and
transmitting frequencies are the same.
ll. Grid Controls RF tuning of receiver and drive tuning of transmitter.
12. Mic. Gain Controls microphone amp. level. On TUNE it becomes a
tuning level control.
13A. Plate Knob. Adjusts PA plate tuning.
13B. Loading | Lever. Adjusts PA plate loading.
14. VFO Select For switching from internal to external VFO. NOR is transceive
on internal VFO. RX EXT is receive on external VFO, transmit
on internal VFO. TX EXT is transmit on external VFO, receive
on internal VFO.
15. PO-IC-ALC Meter selector switch. Switches meter functions for trans-
mitter metering.
16. Sideband Sideband selector slide switch. In the NORMAL position,
LSB is produced on 3.5and 7 MC, and USB on 14, 21 and 28
MC. In the REV position, USB is produced on 3.5 and 7 MC
and LSB on 14, 21 and 28 MC.
17. PTT-VOX Slide switch. Selects PTT or VOX functions.
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Power Supply Connector
Speaker Socket
Accessory Socket
Earth Terminal
Key Socket
VOX Gain
Anti-Trip
Delay
Relay Sens
Carrier
Bias
Meter Sens
Meter Zero
Aux
Step 1 of Operation
FUNCTION
RF—AF—GAIN
BAND
CLARIFIER
(Receiver offset tuning)
PLATE
LOADING
METER SWITCH
OPER—REC
SIDEBAND
MIC GAIN
CAL
VFO SELECT
Provides low level R.F. drive for VHF transverter.
Antenna coax socket.
(see P.
8 ohms
15 for details)
(see P. 15 for details)
Adjusts
Adjusts
Adjusts
Adjusts
Adjusts
Adjusts
S-meter
Adjusts
VOX sensitivity.
VOX anti-trip level.
“hold-in” time of VOX
operating level of VOX relay.
level of re-inserted carrier for AM/CW operation.
bias on PA tubes.
sensitivity control.
S-meter zero setting.
External VFO socket.
OPERATION
POWER OFF
RF maximum clockwise
AF about half on
Set to desired band
OFF
Set to desired band
Minimum loading
IC
REC
NORMAL
OFF
In released position
NOR
10
Set controls as shown below
First check that all cable connections are correct and that antenna of correct frequency
and impedance within the range of the Pi-net (50 100 ohms) (coax output) is connected
to the transceiver. AC power plug should not be-connected until all preliminary checks
are carried out. Aux plug provided should be inserted in auxilary VFO socket if
external VFO, TEMPO VF/one is not used. Turn power on with function switch to
SSB position. Panel lamps should light and S-meter needle will show a full scale reading
Then slowly return to “O” asset warms up. This can be accepted as an indication that the set
is then ready for operation.
Tune GRID for noise peak.
Adjust main tuning dial for signal.
Peak GRID for maximum S-meter reading.
Careful tuning is necessary to obtain correct tone of SSB signal. If the received signal 15
on opposite sideband, then move REV-NOR switch to REV.
A bedt note indicates that an AM signal is being received. In this event turn function switch
to AM. Adjust AF gain for comfortable listening volume. Sometimes a slight reduction of
КЕ gain will obtain clearer reception.
Transmitter tuning
IMPORTANT :
Heater voltage to final tubes 6JSBA is supplied through a jumper wire
between pin | and 2 of accessory plug, so the accessory plug must be
placed in the accessory socket to provide this heater voltage.
Transmitter should be tuned into a 50 ohm dummy load, but it may be tuned on an
antenna provided that the band is clear; and no interference will result to other stations.
Take care to ensure that transmitter frequency is adjusted within frequency limits of
band in use.
DO NOT OPERATE TRANSMITTER with no load connected; otherwise PA tubes could
be damaged.
Disconnect microphone, meter switch to IC, MIC gain off, control switch to PTT, function
SSB. Then when REC-OPER switch is moved to OPER, and using power supply of
600V HT, the meter will indicate the PA resting current.
This should be 60 MA; if not, then adjust bias control at rear.
Now turn FUNCTION switch to TUNE, advance MIC gain to obtain a small increase in
meter reading, up to about 100 MA, and adjust GRID for maximum IC. Note that the
setting for the GRID control will be virtually the same as was found for receiving. Reduce
MIC gain. if IC rises abnormally high.
Adjust PLATE for minimum dip in IC. Switch meter to P.O. and adjust PLATE and
LOAD controls in turn for maximum RF power out. IC should dip to about 70/80% of
the off-tune current for best loading condition. At maximum input the IC is about 350
MA, but refrain from using this high current for longer than a few seconds; therefore
make all adjustments quickly. During tune-up, switch REC-OPER switch off periodically
to reduce the time transmitter is on with high IC.
While it is permissible to tune transmitter, using meter оп Р.О. position, it is recommended
that an external SWR meter be connected between antenna socket and feedline, not only
to check matching of transceiver to antenna feedline and observation of transmitter RF
output, but so that transceiver meter can be left in IC position for constant monitoring
of PA current. Any abnormal rise-in IC can then be noted and quickly corrected.
11
Transmission
SSB
Insert microphone plug of PTT microphone. (If microphone does not have a PTT switch,
then short out PTT terminals on plug and control transceiver with REC _OPER panel switch.)
Turn REC—OPER switch to OPER.
While speaking, adjust MIC gain for correct IC meter “kick-up” Switch meter to ALC
and check that needle does not rise above limit of green section of scale on speech peaks.
Indicated IC will be about half the tuning IC, ie. about 150 MA on peaks. Attempting
to obtain more power by “forcing” or overdriving the transmitter will obtain only an
insignificant increase in strength and will result in a distorted signal with possible radiation
of spurious emissions. Keep MIC gain down, speak fairly close to microphone to reduce
background noise pick up, and try to maintain an even level of speech.
Do not have VOX gain control set too high; otherwise operation will be unstable. If anti-
trip control is advanced too far, then VOX will lose sensitivity. Set anti-trip to a position
where it is just preventing speaker noise from “triggering” the VOX. If VOX fails to
function, check that microphone has sufficient sensitivity and if OK then replace V9 and
re-adjust relay sensivitity control.
Cw
Remove microphone plug. For CW operation on 7 and 14 MC, place Sideband switch in
REV position; otherwise drive will be low. The varicap diode is connected to only one
carrier crystal (9001.5 kc) and this diode’s operation shifts carrier within filter passband.
Use clarifier control only for changing or tuning-in the received signal, e.g. small readjust-
ment to return a drifting signal or adjusting pitch of received signal. Once main VFO
control has been set to frequency of desired contact, it should not normally be altered;
otherwise each station will be retuning and moving through the band.
For break-in operation set control switch to VOX and adjust VOX delay, etc. to suit
requirements. Do not hold key down for long periods; otherwise PA tubes can be damaged.
Use CW IC at 250 MA. MIC gain will control sidetone level.
AM
Place function switch on AM, MIC gain to “O”. Set AM carrier control at rear to give
IC of 150 MA. Adjust MIC gain so that speech deflects meter a further 5—10 MA. As for
CW, set control to REV for 7 and 14 MC bands. PTT or VOX can be used in the same way
as for SSB operation.
12
ALIGNMENT
The TEMPO one has been correctly aligned at factory and, under normal circumstances,
realignment should not be necessary except after a long period of use. The alignment of
such modern, sophisticated equipment as this requires the correct test instruments and
should not be attempted unless one has had a reasonable amount of experience in such
alignment techniques.
CAUTION — Before any work is attempted, remember that high voltages are employed
in this equipment, so — TAKE CARE!
l. Equipment required
VTVM with RF probe
RF standard signal generator
AF signal generator
Circuit tester
Frequency meter
Dummy load 50 ohms
Suitable alignment tools
2. Voltage and resistance measurement
Refer to tables on Page 17
Note that measurement figures obtained could vary slightly from those shown, par-
ticularly if a low resistance testing meter is used. Always turn off power, remove AC
plug, and completely discharge all filter condensers before taking measurements.
3. Voltage regulator
The V.R. is mounted on a printed circuit board and supplies a regulated output of
9V, adjustable by the pre-set type miniature pot VR501. If output cannot be brought
up to the 9V, level it may be due to a fault in components on the printed circuit board,
e.g. transistors or zener diode, or supply voltage below 11V.
4. VFO alignment
On the red scale, “O” —5 MC and “500” = 5.5 MC.
Switch off crystal heterodyne oscillator by placing bandswitch on 3.5 or 14 MC band.
(Receiver offset tuning) OFF.
Use frequency meter for alignment, although this can be done, with care, if beats are
heard every 100 kc using the crystal calibrator.
Coarse alignment is by adjustment of trimmer TC401.
The piston type trimmer TC402 is for adjustment of temperature compensation. If
turned clockwise, then compensation becomes greater. If TC4U2 is adjusted,then 1C401
must be re-adjusted to maintain calibration.
For precise adjustment of dial linearity, careful adjustment (by bending) of end rotor
plates of main tuning condenser is necessary.
VFO injection to grid 1 of V3, 6CB6 should be 0.5V or more over full VFO range,
measured with VTVM and RF probe. To obtain same frequency of clarifier at “O” as
at “OFF”, adjust VR7.
. Heterodyne crystal oscillator
Apply RF probe to Pin 2 of V3, and with bandswitch at 28.5, adjust L202 for
maximum meter reading.
On 21 MC band adjust TC202.
On 7 MC band adjust TC201
If optional 10 meter range crystals are added, use type HC18U crystals with wire leads
soldered into marked positions on heterodyne oscillator print board.
Adjust appropriate trimmer condensers for 10 meter crystals.
Calibrator 100 Кс
Adjust frequency with TC301 by checking against WWV with aid of separate receiver.
Pre-mixer (VFO mixer)
This is V3, with output plate tuned circuit to select resultant beat of VFO and
heterodyne oscillator (or VFO frequency in case of 3.5 and 14 MC bands).
This alignment should be carefully done as other frequencies can appear at output,
VFO, etc. This alignment is explained in transmitter alignment section. Refer to chart,
below, for correct output frequencies.
Band Mixed Frequency
3.5 5 — 5.5 MHz
7.0 16 — 16.5 MHz
14.0 S — 5.5 MHz
21.0 30 — 30.5 MHz
28.0 37.0 — 37.5 MHz
28.5 37.5 — 38 MHZ
29.0 38 — 38.5 MHz
29.5 38.5 — 39 MHz
RECEIVER ALIGNMENT
Audio output stage
Connect audio generator with 1000 cps output of 0.1V level to moving arm terminal
of AF gain control, and with control at maximum volume, an output of 1 watt
should be obtained from the 6BME, V101.
AGC
Function switch to AM, RF gain maximum, then S-meter should read “O” with
antenna socket shorted. Set VR102 (AGC adjust) so that it is at a point just before S-
meter needle commences to rise above “O”. Now adjust meter sensitivity control so
that, with S.G. 50 uV signal to antenna socket meter will read S9. Open circuit output
14
of S.G. will be 100 uV, dropping to 50 uV when S.G. is connected to antenna socket,
because of loading effect of receiver. Now set function switch to SSB, short out antenna
socket, and meter should read “O”; but if not, then adjust the compensation capaci-
tance (C165) between pin 2 and pin 8 of V 102 to make meter read minimum deflection.
LF. amplifier
Connect signal generator at 9,000 kc and adjust tuning for maximum S-meter reading
at center of filter passband by observing S-meter at same time as tuning S.G. frequency.
Now adjust L101, L102, L103, L104 for maximum meter reading.
Receiver mixer
This is V1 6U8 (alternative types 6EA8, 6GHS8). Connect RF probe to pin 8, cathode
of triode section, and adjust grid tuning. Oscillator injection should read greater than
0.5V on every band. Adjust trap coil L22 for minimum beat at 21.3 MC. This adjust-
ment should occur within one turn of the core slug. L1 is trap coil for 3.5 and 14 MC
bands and should be adjusted so that no oscillation occurs in these bands. Use a plastic
alignment tool so that no damage will result to the internal hexagon type slugs.
RF amplifier |
Connect S.G. to antenna. On 3.5 MC band set VFO to “0” on black scale and GRID
to second point up from its counterclockwise position. Apply 3500 kc signal and adjust
L7 and L12 for maximum S-meter reading. Use plastic alignment tool. 7 MC band,
VFO to “O” on red scale, GRID at same point as for 3.5 MC, S.G. at 7000 kc. Adjust
TC1 and TC2 for maximum.
14 MC band, VFO to 250, GRID at center position, S.G. at 14250 kc. Adjust L10
and L15 for maximum.
21 MC band, VFO to 250, GRID at center, S.G. at 21250 kc. Adjust L9 and L14
for maximum.
28.5 MC band, VFO to 500, GRID at center, S.G. at 29,000 kc. Adjust L3, LB
and L13 for maximum.
On 7 MC band, VFO to 500, apply 9 MC signal of sufficient level to give an S-meter
reading; then adjust L2 for minimum dip in S-meter reading.
TRANSMITTER ALIGNMENT
The transmitter uses many common receiver circuits; therefore it is necessary to first
correctly align the receiver section. A 50-75 ohms dummy load must be used on the trans-
ceiver during transmitter alignment. Take care to avoid touching H.V. points!
‘Balanced modulator
Function switch to TUNE, meter to P.O., tune transmitter for maximum reading.
(Keep IC down by use of MIC gain).
15
Now function to SSB, MIC gain to zero, and adjust VR 106 for minimum reading. For
most sensitive indication, connect RF probe to dummy load, or use another receiver
and observe its S-meter reading.
Then switch to opposite sideband position, and readjust VR106. Repeat several times
for best result. If there is a marked difference between the two positions, then adjust-
ment of carrier oscillator or crystal filter may be required.
Crystal filter
The filter is aligned once in receiver alignment, but further alignment in this section
(transmitting) is necessary.
At the TUNE position adjust L103, L104 and L105 for maximum output. Keep drive
reduced to a fairly low level for the most accurate determination of the maximum
peak. In order to examine filter characteristics, set function to SSB and connect an
ALF. generator to MIC jack, then take a curve of the A.F. response (in effect, the filter
passband), by plotting between 300—2500 cps. If output level changes no more than
3 dB, then it is OK. Repeat on reverse sideband. If the two curves do not match, then a
slight adjustment of each carrier crystal frequency is necessary to bring the two curves
together 1n their frequency limits. If carrier is too close to 9000 kc filter center
frequency, then high audio frequencies will be attenuated. If carrier is too far removed,
then low frequencies will be attenuated. Carrier frequency adjustment is by TC101
and TC102.
Driver stage
Set up transmitter on TUNE, but keep level down to safe limit by adjustment of MIC
gain control; then adjust driver coils and trimmer condensers for peak in output, as in
receiver section alignment.
FINAL AMPLIFIFR NEUTRALIZATION
When replacing the final amplifier tubes, it may be necessary to reset the bias to
give correct idle current and check neutralization. Using the procedure outlined
below will guarantee maximum output and long tube life.
CAUTION
HIGH VOLTAGES ARE PRESENT ON UNDERSIDE OF CHASSIS AND INSIDE
OF FINAL COMPARTMENT. USE GREAT CARE WHILE MAKING ADJUST-
MENTS WITH WIRING EXPOSED.
(1) Connect a dummy load to antenna, and set meter to IC.
(2) Locate TC-3 the neutralization variable capacitor shaft in the final amplifi-
er compartment.
(3) Check final amplifier idle current in USB or LSB position and adjust as
described before.
(4) Tune up the transceiver at 21.5 MHz, with MODE switch at AM position.
and advance CARRIER potentiometer (9 or the rear panel unul meter IC reads
150 MA.
16
(5) Rotate PLATE tuning control and observe dip as indicated on the meter.
If the dip is not prominent, reduce loading control slightly for better indication.
As the PLATE control is rotated the meter should rise equally and smoothly on
either side of maximum dip indication.
(6) Determine which side of the dip rises abruptly. Set PLATE control slightly
to this side of dip keeping the meter reading below 150 MA.
(7) Using no metallic tuning wand, rotate neutralization capacitor shaft very
slightly in the direction which reduces the current shown on the meter. Repeat
steps 6 and 7 until the meter indicates a smooth and equal rise on either side
of the maximum dip point.
The final compartment cover must be in place to supply the RF shielding requi-
red during the neutralization procedure.
Plug connection
ACCESSORY SOCKET CONNECTIONS
1. 6JS6A heater 8. Ground ACC QUT
2. 12.6Y heater 9. Relay close on transmit
3. +150Y —use to control linear
4. +300V amplifier
5. +600V 10. Relay common
6. —-100V ll. Relay close on receive
7. ALC input
Power socket connections
EXT VFO
I. —l100V
2. E
3. +300Y
4. +600V
$. H COMMON
6. HAC 12.6Y
7. SPEAKER
8. HAC 126Y
9. LINE |. I2VAC
10. LINE 2. GROUND
3. EXT VFO INPUT
11, +150V
4. GROUND
5. INT VFO CONTROL
6. 9VDC OUT
7. 9VDC OUT
Mic Plug (PTT)
| | e
Mic Plug
Key Plug
a В
17
TEMPO AC/one POWER SUPPLY WITH SPEAKER
The TEMPO AC/one power supply is designed especially for the TEMPO one Transceiver.
A dynamic speaker is included within the power supply cabinet. Refer to circuit diagram
below for details. Note that the major HT winding is tapped 240,460 and 600. providing
DC output of 300V, 600V or 800V to the final tubes. However, for the TEMPO one,
600V DC is sufficient for rated output. If 800V is used, then the input will be excessive
—use only on 600V DC maximum. |
Bias section has only half wave rectifier as current drain is very small.
Heater winding, 2 x 6.3V, 6A is connected in series to provide 12.6V at 6A.
69 39 POWER
9 © ло!
or No, O
EN 2
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(9) LINE
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C501 - 504 4700P ©
PB-1004-2 C509 ~ 512 4700P LINE
R501.503.505.507 470K
D501.503.505.507 10DI0
D509~ 512 151944
ПТУ
PIO! 1
C511
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= C105 = CIO6
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450WV 300WV (1)-100v
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_ 6.3V -
T101 NOTES: ,
| ALL RESISTORS IN OHMS 1/2W 410%
UNLESS OTHERWISE NOTED. (7) SPEAKER
2. ALL CAPACITORS IN uF
UNLESS OTHERWISE NOTED. sp
POWER SUPPLY
18
RECEIVE 7MHz SSB NORMAL
(м)
| TUBE PIN | 1 2 3 4 5 6 7 8 9 10 11 12
V1 | 6U8 150 | —1.8 33 ac 0 145 1 14.5 | 135
va 6BZ6 —0.1 0.8 | 64 | A 140 60 0
V3 | 6CB6 “02 2 eS 0 145 40 0
Va | 6E17 0 —90 0 AG | AC 0 145 0 0
V5 | 12BY7A 0 —90 0 AG 0 = 350 320 0
Ve | 63ssa , AC 0 150 0 —90 — — — —90 0 150 | AC
V7 | 6JS6A 0 0 150 0 —90 — — — —90 0 150 ас
V8 | 6AVE 0 1 0 ac — — 110
V9 | 12А 7 25 | —0.5 0 as ac 140 | 0.35 55 AS
Viol | 6BM8 0 10 0 ac Ни 330 140 1 65
V102 | 12AX7 —0.2 —95 —95 ÈS 0 150 —1.5 0 -
VIO | 6BZ6 —0.1 1 ac AC 145 100 4
V104 | 6BA6 —0.1 1.2 0 AC 145 110 1.2
| Vies| 12Ax7 110 0 1 АС 0 140 0 0 a
Vis | 12407 0 3.5 6 0 0 130 0.15 6 ac
vio | 7360 0 150 —95 ac 0 150 150 30 30
TRANSMIT 7MHz SSB NORMAL
(V)
TUBE IN 1 2 3 4 5 6 7 8 9 10 11 12
v1| 6U8 150 —80 145 ac 0 150 0 0 —60
у 2 | 6В26 —60 0 AC ac 145 0 0
V3 | 6СВб -0.2 2 aC 0 145 40 0
Val 6EJ7 2.2 0 2.2 AS ac 0 145 120 0
V 5 | 12BY7A 5 0 0 AC 0 — 330 240 0
V6 | 6JS6A eS 0 150 0 —50 — — — —50 0 150 5%
V7 | 6JS6A 0 0 150 0 —50 — — — —50 0 150 ac
V8al 6AVE 0 1 0 ac — — 110
V9 | 124U7 25 —0.5 0 ея 63 100 0.4 VOXIÉ 176
V101| 6BM8 —80 10 0 ac AG 330 140 1.5 140
У 102 | 12АХ7 —0.2 —95 —95 ac 0 120 | —1.5 0 —
V1093| 6BZ6 —60 0 eS AC 150 120 0
V 104! 6BA6 0 1.2 0 ac 140 110 1.2
V 105| 12AX7 105 0 1 >. 0 105 0 1 —
V 106 | 12AU7 0 3.5 6 0 0 130 0.15 6 a
V107| 7360 1.8 90 —1.3 ac 0 110 110 30 30
RESISTANCE 7MHz SSB NORMAL
(Q)
TUBE PIN 1 2 3 4 5 6 7 8 9 10 11 12
Vi1| 6U8 8K | 500K | 500K 0 0 9K IK 1K | 100K
V2 | 6BZ6 3.5M | 100 0 0 9K 20K 0
уз | 6CB6 1.5K 1K 0 0 9K | 280K 0
Val 6EJ7 470 220K | 470 0 0 0 9K 18K 0
У 5 | 12BY7A | 200 170K 0 0 0 0 со œ 0
Ve | 6JS6A 0 0 8K 0 100K — — — 100K 0 8K 0
V7 | 6JS6A 0 0 8K 0 100K — — — 100K 0 8K 0
V8 | 6AV6 Sox | 2.2K 0 0 — — 110K
Vo | 12AU7 110K 3.3M 0 0 0 15K Im 8K 0
Viol| 6BM8 470K | 390 220K 0 0 00 9K | 4.7K | 220K
V102 | IZAX7 3.3M | 1.3M | 330K 0 0 со 100K 4 0
VIO | 6BZ6 3.3M 75 0 0 9K 15K 0
V104| 6BA6 3.3M | 100 0 0 эк 15K 0
V105 | 12AX7 wok | 2ox | 22K 0 0 110K | 220k | 2.2K 0
V106 | 12AU7 со 85 К 1K 0 0 10K 85K 1K 0
V107 | 7360 1K | 160K | 600K 0 0 35K 35K 55K 55K
19
C-CAPACITOR
F117, 123, 137, 138, 139, 148, 502 |
63, 161 FM-MICA 500WV SP + 109% 29, 41, 122, 504. 602 LW 1.5KQ + 10%
402 ” 8P и 3, 27, 43, 54, 59, 7 2.2K |
12, 17, 42, 44, 112, ” 10Р " 134, 160, 405, 409 и
139, 201, 306 402, 802 я 3.3KQ 4 |
11, 119, 132, 141, 403, 417 ” 20P и 102, 126, 147, 159, 201 я 4.7KQ #07
406 1 30P u 505, 509 y;
602, 99 ” 40 P ” 406 „ 8.2K "
22, 23, 36, 138 y sop 7 1, 9, 46, 52, 62,64, 72.73 ‚ IOKQ x
28, 91, 92, 604 i” 60P 7 111, 114, 118, 163, 302, 401 и
38 ” 70P Hr 403 " 18K a
134 A ФОР и 130, 154, 202, 512 р 22K ©
16, 20, 31, 35, 49,89, 90, 113 + IOOP » 801 ” 27 ко 7;
116, 117, 122, 123, 127, 142 36, 38, 404, 506, 511 7 33KQ
154, 166 37, 39, 40, 42,47, 119, 143 и 47 ко и
39, 148, 149, 204, 305 и SOP » 144, 146, 149, 151, 152, 153
| 605 ” I70P » 164, 165, 166, 507
32, 40 " 200 P и 2, 5, 6, 19, 44, 56, 65, 110 I” 100K Q и
408 " 250P + 112, 128, 131, 132, 133, 136
37, 133, 140, 511 ” 300P + 140, 155, 156, 303
30, 601, 603 ” 350P — 150 1W 150KQ + 10%
2,43, 64, 109, 110, 128, 163 ” 470P u 103, 104, 108, 116, 121 — 220K9 w
168, 169, 172, 303, 409, 410 125 ” 330KQ #w
| 61, 415 " 680 P " 20, 23, 26, 105, 135 ” 470KQ ir
60 A 1000P » 141, 142, 157, 158 |
33, 34, 301 ” 2000P » 7, 8, 127 IMQ и
67 MYLAR 250WV 0.047 4, 18, 51 ” 1.5MQ »
7, 8, 106, 107 50WV 0.1, 107, 109 и 2.2MQ и
124, 302 4, 124, 129 я 3.3MQ и
|151 OIL 400W V 0.047, 67, 69 1. W 568 и
103 “ и 0.0 le 60 ” 1200 #
6 MP 250WV 0.047 4, 101 ” 3900 "
41 MICA 1.5KwWVW 50P 57 1 10K 1
55 7 IKWY 100P 33 " ISK и
58 и 3K WV 500P 11, 407, 603, x75 2 W 22KQ "
| 98 CERAMIC AC3KV 100P 77 5 W 5.6KQ —
% 413 и S00WV 3—5P UJ 55 10W SKO и
414 ” 7- 10P UJ VC-VARIABLE CAPACITOR
404 " ” 20P UJ 1 RPESELECTOR (330P + 20P)x 3
420, 421 FEEDTHROUGH BYBASS ого 2 PLATE 300P MAX
SOOWV 1000P - 9 3 LOAD 340P x 2
131, 160 ELECTROLYTIC 10WV 104 401 VFO OSC 37Px2
155, 502, 503, 508,5 —» 16WV 10, TC- TRIMMER CAPACITOR
29 ” 300W V 20 1, 2 KT-G-50P (MICA)
85. 93 ” 150WV Ice 3 150C 10P 1.5KV AIR
101 ” ISWV 304 101, 102 1ZW-10P CERAMIC
| 104 и 150WV 30 201 — 206 1ZW20P CERAMIC
111 ” 350WV Ou 301 DT-120 50P |
— 501 и 16WV 470. 401 30P AIR ||
506 CERAMIC DISC SOWV 0.002. 402 10P <2 AIR |
59, 70,71. 76 ” 14K V 4700P 201, 401, 402, 502, 801 2SC372Ÿ
| 46. 50, 202, 401, 405 » SOWV 0.01, 301, 501 2SC367Y (25C735Y)
407,411,416, 418, 504 503 2SC373 (2SC828 О)
505, 507, 509, 510 D-DIODE —]
4, 14, 18, 68, 144 CERAMIC DISC 500WV 0.001, 1-5, 101— 103, 106 SH-1 (1S1941) SILICON
157, 1008 | 6, 7, 104, 105, 301 151007 СЕВ. |
| 3.9.13, 15,19. 24, 25, 27. » SOOWV 0.01, 401 | [S145 VARI CAP.
45,47, 48, 51, 53, 54, 56. 57 501 1S336 11V ZENER
65. 66, 69, 73, 75, 78, 87, 88 502 1S336 6V ZENER |
94, 100, 1001, 1007, 102, 105 VR-VARIABLE RESISTOR
108, 114, 115, 118. 120, 121 1 AF + RF GAIN 500K-A + 10K-C
125, 126, 129, 130, 136, 137 2 MIC GAIN SOOK-A
143, 145, 146, 147, 150, 152 3 ANTI TRIP 100K -B
153, 156, 158, 159, 162 4 VOX GAIN 500K A
72. 74, 80 -- 83, 95, 96, 97 и 5 DELAY 3M-B
203, 205. 206, 207, 304, 419 SOWV 0.047, 6 CLARIFIER SOKB +SW
| R-RESISTOR 7 (RF A) 50K-B (20K B)
63 L5W 220 + 10% 8 CARRIER 3M-B
66, 68. 70, 71 ; 56Q + 9 RELAY SENS 3K-B
11s и 6892 vw 101 (ALC ADJ) 2K-B
10,25.120,411,412.805,513 y 1000 » 102 (AGC ADJ) IOK-B ~~ |
48, 510. 803 y 1SOQ » 103 BIAS 20K -B a
301, 408, 410, x 78. 804 и 22002 » 104 SM-SENS SK -B sv
145, 203, 204 gr 33062 #+ 105 SM-ZERO 500-B )
| 501 и 3900 + 106 CARRIER BALANCE 5K-B
45 ” 470Q # 501 (VOLT ADJ) IK-B
| 503 5 5600 › 502 (TONE OUT ADJ) 10K-B |
76 u 6800 + 503 (TONE F ADJ) 10K-B _
21. 22. 28, 32, 53 = ” IKQ y 504 (TONE OSC ADJ) 10K-B
20
(A )
A
( ) 328
XF-CRYSTAL FILTER
XF- MHz
X-CRYSTAL
U 9001.5K Hz
K Hz
7
PL-PILOT LAMP
T-TRANSFORMER
Q
METER
7
(SHUNT)
PB-PRI
AT
VOLT REG-+ TONE OSC
T
SID BAND
PTT/VO
OPER/REC/CAL
ALC/IC/PO
VFO SELECT
POWE
V-VACUUM TUBE
AXTA
6BA6
VS-VACUUM TUBE SOCKET
P) -122
7P) SB-08
P) S7-201Y
Р) $ 7
ЭР) SB-1307-2
7P) SB-0905-
9P) SB-13 2
SG-7615 2P
RCA-7017
SG-7814-1 3P
SG-7615 2P
RCA-7017
JSO-239 (INCH
PA B
SA-602B (11P)
S ] P
S-H3001 (2P
RCA-7017
S-H3601 (3P
M-P-7 (INCH
S-A604B (11P)
A 2B (11P
-1 7302 (7P
H
0.64 3T,S
645 T; 5
0.06/4 97 T:12W1.sK
4
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TV-245
0.064 23T;0.345T
Ah $
LW 560 4TS 0.6
S 1
2 2675
. >x 65
2 IST 9.5TAP
2504 H
C OUT
VFO OSC (158x 32
BAND PASS (VFO)
0.08 SOT
m
( AC POWER SUPPLY
C-CAPACITOR
LECTROLYTIC
450WYV 47,,<2 or (40, x 2
450WY 33,,x3 or (404.40 + 20
ELECTROLYTIC
300WYV 47,, (40,,)
ELECTROLYTIC
160WYV 22 (20244)
1.4KV DC 0.01
501 — 504,509— 5 CERAMIC DISC
509 — 512 1.4KV DC 4700P
S500WYV O.O1,;
R-RESIST
I
1 62 +
505, 507
KQ 1
Q nm
SILICON 10D10
” ESI
” IS 1947
T- TRANSF ER
WER TRANS
"FILTER CHOKE
2.5H 16 A
SP-SPEAKER
No
FH-FUSE HOLDER
101 S-N 1001
F-FUSE
101 11] 5A
PRINTED BOARD PB-1004-2
J-JACK
A-602B (11P)
J 3
$3
УК!
rz PRES
RSS
VFO
PL
VR2
HETERODYNE HS Mi
"a V105
vi V102
V4 V106
уст
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v2 v103
VFO BPF L102
Tes 3 V107
ма МО vis
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120
vi L105
vc2 ANNE XF101
I == — Ba наЕ => ae RL101
100KHZ CALIBRATOR L104
v8 =n VR3 7 Вы N VRS V101
22
TEMPO DC/one DC POWER SUPPLY
This supply provides all necessary voltages from 12 volt battery for mobile operation.
The TEMPO DC/one DC mobile supply is designed for the TEMPO one Transceiver.
23
AMOOZ NZZ
+MH-—.
el3
+600V
H
AMOO2 NZZ
+ —
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