Amplifier-Multiplier 3A5

TM 11-5820-695-35

and output VSWR's are 1.25: 1 (max). The output

status panel 3A8 OSC TEMP indicator when the local

signal, at a nominal level of -20 dBm, is applied through

oscillator 3A2A3 oven is on. TP1 is colored black and

semirigid cable W3 to coaxial mixer 3A2A2.

resistors 3A2R2, 3A2R3 and potentiometer 3A2R4 form

the divider network that scales the power monitor signal

current for a test meter indication of between 60 and

b. Local oscillator 3A2A3 supplies the second input

140 (25.0 +8.0 ua) on Receiver, Radio R-

to mixer 3A2A2 for the down conversion of the RF

1467(P)A/GRC-144 meter panel assembly 2A15A2

signal to C-band range. Oscillator 3A2A3 is a voltage

meter when the power level is in the normal range. The

controlled oscillator with crystal oscillator frequency

LO POWER signal is also routed through filter 3A2FL3

control of output signal frequency in a phase-lock loop

and connector plug 3A2P1 pin 8 as an LO PWR monitor

circuit. To assure frequency stability and constant level

signal to the alarm monitor 3A1 circuits. Test point TP2

output, the dc operating voltage is internally regulated

+28 V at 3A2J2 is the +28 Vdc operating voltage

and the crystal oscillator is enclosed in a temperature

monitor point. TP2 is colored black and resistor R1

controlled oven. When BAND SELECT switch 3A2S1 is

scales the current for indication in the test meter black

in position 1, the operating frequency of 3A2A3 is 10.00

band for normal range. Readings at all the test points

GHz. When 3A2S1 is in position 2, 3A2A3 pin 7 is

are taken by means of a test lead from the test meter at

grounded at El through switch 3A2S1-2, 3A2Sl-C and

the panel of the R-1467(P)A/GRC-144.

3A2TB1 terminal 14; the frequency of A3 is then 10.02

GHz. In either case the frequency stability is 1 part in

2-86.

Amplifier-Multiplier 3A5

107 per day. The output signal level is a nominal +13

dBm (11 dBm, min.; 15 dBm max.). This signal is

Amplifier-Multiplier 3A5 (fig. 5-101) performs as a C-

applied through coaxial attenuator 3A2AT1 to mixer

band to K-band up converter, converting the

3A2A2. Isolator 3A2AT1 has an attenuation of 3 dB; it

Transmitter, Radio T-1054(P)A/GRC-144 4.8 to 5.0 GHz

isolates oscillator 3A2A3 from the loading effects of

band frequency signal to 14.4 to 15.0 GHz. It is a fixed-

3A2A2 for frequency and signal level stability. The

tuned broadband amplifier and frequency multiplier.

conversion process in 3A2A2 produces a signal power

The frequency multiplier 3A5A1 (fig. 5-101.1) is

loss of 10.5 dB (max.). The output signal from 3A2A2

comprised of a frequency tripler-amplifier A1A1 and

consists of the input signals and the sum and difference

converter-regulator A1A2. The fixed tuned broadband

frequencies and their harmonics. Isolator 3A2AT2 (0.5

amplifier portion is comprised of three impatt amplifiers

dB insertion loss) provides an impedance matching load

and associated circuits, including current regulator 3A8.

for 3A2A2. The RF OUT signal at jack 3A2AT2J2 is

routed to a receiver. The desired operating frequency

signal (RF frequency minus local oscillator frequency) is

a. The signal at J1 RF IN is a transmit signal in the

selected by a bandpass filter in the receiver.

C-band range, at a level of +24 dBm (min.). This signal

is coupled through circulator A1A1HY1. Circulator

A1A1HY1 is a 4.8 to 5.9 GHz ferrite device that isolates

c. An oven temperature monitor in the 3A2A3

3A5A1 from the transmit circuit and acts as a

supplies a status signal at connector 3A2A3 pin 9. This

termination for the cable. The frequency tripler portion

signal is routed through filter 3A2FL2 and connector

A1A1Z1, Z2 and field effect transistor (FET) Q1 of

plug 3A2P1 pin 7 as an OSC TEMP NORM signal to

frequency

multiplier

3A5A1

tuned

illuminate

the

Change 6 2-135