Section IV. FUNCTIONING OF INDICATOR, ANTENNA ALIGNMENT 1D-1708/GRC CIRCUITS

TM 11-5820-695-35

Section IV. FUNCTIONING OF INDICATOR, ANTENNA

ALIGNMENT 1D-1708/GRC CIRCUITS

from 70 MHz intermediate frequency am plifier 2A5 in

2-78.

General

the R1467/GRC-144 is applied to meter Ml through

connector P1, cable W1, and switch 91 (ON position).

Indicator, Antenna Alignment ID-1708/GRC is used to

Capacitor C1 averages out the fluctuations of the

measure the relative signal strength of the 70 MHz if

incoming agc signal to provide a peak reading on the

carrier signal in Receiver, Radio R-1467/GRC-144. The

meter.

In the OFF(TRANSIT) position, switch S1

agc level, derived from the 70 MHz If carrier signal, is

provides a short across the meter. Terminals E1 and E2

applied to the ID-1708/GRC to provide a relative

are provided for connecting a telephone handset to

signal strength indication and facilitate antenna

permit communication over the link and also with shelter

alignment.

personnel. Terminals E1 and E2 are connected to the

remote phone circuit through P1-F and P1-G.

2-79.

Indicator, Antenna Alignment

ID-1708/GKR Circuit Functioning

(fig. 2-28)

The agc signal level and the agc meter reference level

Figure 2-28. Indicator, Antenna Alignment ID-1708/GRC, schematic diagram.

2-120