TM 115826-225-35
dc bias is fixed and RF gain cannot be man-
ually controlled. In all operating modes, base
and emitter voltages are controlled by an age
voltage applied through R14 and R135. Bal-
ance adjustment R136 balances emitter cur-
rents of Q2 and Q4. The push-pull RF output
signals of Q2 and Q 4 are applied to the center-
tapped primary of T107, T108, or T109.
c. In antenna operating mode, only the sense
1-10. Mixer Input Tuned Circuits
antenna is used and no signal appears on the
RF transformers primaries. In loop operating
mode, switch wafer S1N grounds the sense
signal, shunted on one side of the balanced
m o d u l a t o r (fig. 5-4), appears as a single-
egded signal on segment Z of rear switch
wafer S10. This RF signal is applied to ter-
minal 4 of a switched transformer primary.
1-9. Push-Pull RF Amplifier
(fig. 5-5)
Change 1 111
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