The K-band 14.4 to 15.0 rf signal from the antenna

TM 11-5820-695-35

when the shelter waveguide or antenna system cause a

rf input to 14.4 to 15.0 GHz and amplifies it sufficiently

sufficiently high voltage standing wave ratio (VSWR)

to provide a 250 mw nominal output at the electrical

to exist because of faulty waveguide connections, water,

equipment chassis 3A7 J4 ANT waveguide output.

etc. The reflected 14.4 to 15.0 GHz rf power is rectified

Refer to paragraph 2-86 for a complete description of

by power detector 3A7CR1 to provide the dc signal to

amplifier multiplier 3A5 circuit functioning. The rf output

operate alarm monitor 3A1 reflected power monitor

from amplifier multiplier 3A5 RF OUTPUT waveguide

circuits (para 2-87).

flange is applied to the input waveguide flange of

bandpass filter 3A7A4 that is a tunable frequency

selective filter whose output is connected at a rear

(2) The K-band 14.4 to 15.0 rf signal from the

waveguide flange to diplexer 3A7HY1. The bandpass

antenna is applied to the transmit/receive port 2 of

filter 3A7A4 is used for tuning (attenuating frequencies

diplexer 3A7HY1. Diplexer 3A7HY1 routes the rf input

on either side of tuned frequency) amplifier-multiplier

frequency to bandpass filter 3A3 and frequency

3A5 output signals to the antenna. Diplexer 3A7HY1

converter 3A2. Bandpass filter 3A3 is used to tune the

permits diplexing (simultaneously sending and

input frequency for down-conversion to 4.4 to 5.0 GHz

receiving) the 14.4 to 15.0 GHz band frequency from

by the electronic frequency converter 3A2. The diplexer

Antenna AS-3398/GRC-144(V) using a common

3A7HY1 is rf connected to BP filter 3A3 through

antenna and waveguides. The diplexer 3A7HY1 is rf

waveguide adapter 3A7W4 and to the antenna system

connected to BP filter 3A4 through waveguide adapter

through directional coupler 3A7DC1.

Electronic

3A7W4 and to the antenna system through directional

frequency converter 3A2 consists of tunnel diode

coupler 3A7DC1. Diplexer 3A7HY1 (fig. 2-34) consists

amplifier 3A2A1, mixer 3A2A2, local oscillator 3A2A3,

of two circulators which route transmit and receive

attenuator 3A2AT1 and isolator 3A2AT2 circuits whose

signals into the required paths. In each circulator, the

functional descriptions are provided in paragraph 2-84.

RF energy entering at any port circulates in the direction

The output signal from the isolator 3A2AT-2 is the down-

indicated by the arrow and exits at the next circulator

converted 4.4 to 5.0 GHz output from Converter-

port. Directional coupler 3A7DC1 and power detector

Multiplier CV-3633/GRC-144(V) that is applied to

3A7CR1 serve as the sensing network to detect

Receiver, Radio R-1467(P)A/GRC-144 through the

reflected forward power fault conditions

receiver waveguide switch through Adapter, Waveguide

UG-1883/GRC.

Change 6 2-130