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Transmitter Power Amplifier V106
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TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
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Limiter Rectifier V802B


Figure 19. Transmitter driver V105 and transmitter power amplifier V106, schematic diagram.
modulator driver. Tubes V805, V806,
the screen grid. Plate voltage is supplied
V807, and V808 perform a dual purpose as
to V803 through plate load resistor R824.
the receiver output amplifier and the
Note. In some rt units, L803 has been substituted
transmitter modulator. On transmit, each
for R850.
stage functions as described in paragraphs
b. The audio output signals developed
43 and 44. However, the plate voltage sup-
across load resistor R824 are coupled
plied to the stages is approximately 300
through C813, potentiometer R843, con-
volts dc on transmit and the drive level is
tacts 1 and 20 of tr relay K802 (energized
increased. Thus, the output power of these
on transmit), contacts 9 and 14 of squelch
stages is higher on transmit than on
relay K801 (deenergized on transmit) to the
receive.
control grid of modulation driver stage
b. The modulated B+ supplied to the
plates of transmitter driver V105 (para
55) and the screen grid and plate of trans-
60. Modulator Driver V804 and Transmitter
mitter power amplifier V106 (para 56) is
Modulator V804 through V808
tapped off the primary winding (terminal
2) of output transformer T802. Jack J803
is a test point for measuring the modulated
a. Tube V804 performs a dual purpose as
B+. The metering circuit connected across
the second receiver audio amplifier and the
37


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