Chapter 2. FUNCTIONING OF EQUIPMENT - TM-11-5895-1097-400006

TM 11-5895-1097-40

CHAPTER 2

FUNCTIONING OF EQUIPMENT

nector provides an output to a frequency counter for

2-1. General

accurate readings. In addition, the test provides a

The TS3630/GRA114 is a solid state receiver used to

regulated dc power source for testing the AN/GRA114

test crystal modules on overtone frequencies

receiver circuit cards.

corresponding to those in Radio Link, Sound Ranging

AN/GRA114. The test set provides a GO/NO GO

2-2. Block Diagram Description

indicator of crystal activity by means of lamps. ABNC con

Figure 2-1. TS-3630/GRA-114 Functional Block Diagram

a. Rcvr Xtal Circuit. The input signal, from the RF

coupled by the crystal filter FL1 to the second mixer Q5.

INPUT receptacle, is applied to the RCVR XTAL

This signal, in conjunction with the signal from the

MODULE under test. The module output is heterodyned

second local oscillator Q6, is heterodyned, producing the

by the first mixer (circuit card A2), producing the first

second if. signal. The second if. signal is then coupled,

intermediate frequency (if.) signal. This signal is then

2-1