Transmitter Frequency Mixer Stage 1A9 Circuit Functioning

TM 11-5820-695-35

signal is also used for output signal level monitoring and

load (L106, R133) and the negative feedback circuit

metering as described in paragraph 2-35a(4).

(L105, R131, R132, C127). The output at Q106 is

coupled to power amplifier stage Q108 through an

Frequency Control Circuits.

impedance matching network. Power amplifier Q108

Refer to

operates from a regulated +12 vdc supplied by voltage

regulator stage Q107. The output at Q108 (nominal

2W) is developed across collector load L112 and

2-36.

Transmitter Frequency Mixer Stage 1A9

coupled through frequency response control network

Circuit Functioning (fig. 2-16)

L113, C146 and C148, through output decoupling

network R154, R155 and R156 and through impedance

The transmitter frequency mixer stage

matching network L117, C154 and C155. The output

mixes the 4.55 to 4.85 GHz signal from the frequency

signal (150 MHz OUTPUT) is routed to frequency mixer

multiplier chain with the 150 MHz fm modulated signal

stage 1A9 (para 2-36). A sample of the frequency

from radio transmitter modulator 1A8 to produce the 4.4

modulated 150 MHz output signal is coupled through

to 5.0 GHz transmit carrier frequency. The mixer

attenuator network R157, R68 and R74 to mixer

consists of crystal mixer 1A9A1 and coaxial circulator

transformer T3 in the frequency control circuits. This

1A9HY1.

2-74.2 Change 6