DRAKE TR-4C - 5-13. RECEIVER IF ALIGNMENT; 5-14. BALANCED MODULATOR & CARRIER BALANCE

Table 5-2. Voltage Chart (continued)
REF
Transistor
DES
Type
MEASURED AT:
Emitter
Base Collector
Q1
2N5950
Located in PTO
Q2
2N3563
Located in PTO
Q3 AT5059 0 0 61
Q4 2N3394 0 11.2 0
_
Q5 2N3877 2.3 2.8 48
NOTE:
All measurements were made with an 11 Megohm VTVM and were taken from ground. RF TUNE,
PLATE and LOAD controls were set as described in paragraph 3-7. BAND switch was on 7.0 MHz,
VFO dial was at 7.250 MHz and SIDEBAND was on X. Receive measurements were made with the
Mode switch in the CAL position and the transmit measurements were made with the Mode switch
in the X-CW position, with the following exception
:
On V14, both receive and transmit measurements were made with the Mode switch in the X-AM
position and with PTT line grounded.
The AC-4 Power Supply was used. Where two voltages are shown, the top is for receive and the
bottom is for transmit. An
"*"”
indicates AC voltage. The accessory 34-PNB jumper plug was in the
noise blanker jack.
5-13. RECEIVER IF.
a. Peak the RF TUNE control on noise at 3.8 MHz.
b. Adjust Tl
1 top and bottom and T12 top and
bottom for maximum noise from the speaker.
5-14. BALANCED MODULATOR AND
CARRIER BALANCE.
a. Disconnect the power supply and reconnect the
screen and plate supply leads to the final ampli-
fier tubes.
b. Reconnect power supply.
c. Connect dummy load to the antenna jack.
d. Peak the RF TUNE control for maximum
receiver gain.
e. Adjust bias per paragraph 3-6. With XMIT GAIN
fully counterclockwise, place the Mode switch in
X-CW position and SIDEBAND switch in X
position.
f. If the plate current exceeds 0.15 Ampere, adjust
the RF TUNE for 0.15 Ampere maximum.
g. If plate current is less than 0.15 Amperes, adjust
Carrier Balance pot until plate current reaches
0.15 Amperes.
h. Peak T14 for maximum plate current. Detune
the RF TUNE control to prevent plate current
from exceeding 0.15 Amperes.
i. Alternately adjust the Carrier Balance control
and Cl 27 for minimum plate current. There
should be no difference in plate current between
the two positions of the SIDEBAND switch.
5-5