Table 3-1. Controls and Functions (cont)

TM 11-5820-917-13

Table 3-1.

Controls and Functions - Continued

Fig.

Control or

Function

ref.

indicator

32.

LAMP TEST

When actuated, energizes all indicator lamps and the

digital LED displays on the receiver front panel.

pushbutton switch

When pressed, provides numeric readout of path 1 time

33.

DISPLAY TIME

PATH 1

on MIN SEC display. Active only when mode switch is

pushbutton switch

in SET 2 or SET 3 position. Used for setting path 2 or

path 3 clocks relative to path 1 clock.

Twelve 4-position thumbwheel switches to select path

34.

PATH PROGRAM-

MER MINUTES

1, 2, 3 or 0 (off) for each 5-minutes in the hour.

switches

35.

A 20 turn potentiometer provides fine adjustment of

STD ADJ

potentiometer

internal 5 MHz frequency standard. One full turn of

potentiometer adjustment will compensate timing drifts

of approximately O.5 milliseconds per 24 hours.

36.

POWER

Main power pushbutton switch/indicator.

switch

Controls power to both receiver units.

37.

AUDIO GAIN

Gain control for audio monitor circuit (speaker and

headphones).

control

38.

Headphones Jack

Connector for optional headphones (insertion of mating

plug disables speaker).

39.

Speaker

Three inch audio monitor speaker (located behind

cooling air inlet grill) .

c. Set Mode. In set mode, the receiver clock for each of three paths can be

started or reset to zero depending on MODE switch position, SET 1, SET 2, or SET 3.

Although the STOP switch is illuminated with the MODE switch in SET position, the

STOP function is inoperative. The PATH PROGRAMMER MINUTES switches are active

in the SET mode, and the frequency sweep starts automatically at each 5-minute

interval that is enabled in the same way as described below for the programmer mode.

The set mode can be used for normal, automatic operation; however, since the START

and RESET switches are active in this mode, it is better practice to operate in the

programmer mode to prevent accidental reset of the system clock. In set mode, the

position of the Chirp sounder record on the CRT screen for a selected path (SET 1,

SET 2, or SET 3) can be adjusted using the MANUAL SYNC controls. An adjustment

of the MANUAL SYNC controls alters the timing of the path clock permanently.

d. Programmer Mode. The programmer mode is typically used for normal, auto-

matic operation after the receiver and associated transmitters are synchronized. In

this mode, a sweep is initiated at each 5-minute interval of the hour depending on

the position selected for the PATH PROGRAMMER MINUTES switches. The START,

STOP, and RESET switches are disabled in this mode. A frequency sweep is initiated

in a particular 5-minute period for the path number set into the PATH PROGRAMMER

3-7