Table 2-1. Operator Controls and Indicators

TM 11-5825-270-10

Table 2-1. Operator Controls and Indicators-Continued

Function

Fig. 2-1

Control/Indicator

Index

No.

This is an indicating-type fuse in series with the ac input to the monitor receiver.

Fuse

When lighted, the fuse is blown and should be replaced. The indicating fuse must

be off during normal operation.

POWER Light

Lights when power ON/OFF switch is in ON position and ac power to the receiver is

present.

NOTE

The POWER light will be off if the fuse is blown even though the power

ON,OFF switch may be in ON position.

ALARM TEST

Switch

Permits operator to test the receiver alarm function. When held pressed longer than

a predetermined delay (delay setting is determined at the time of installation,

between 0.1 to 60 Sec), the receiver generates an alarm condition.

NOTE

ALARM TEST switch is provided for self-testing the receiver only; the

alarm condition thus generated may be terminated by releasing the

AUDIO LEVEL

ALARM TEST switch.

Control

Permits adjustment of the loudspeaker volume; minimum volume when fully

counterclockwise, maximum volume when fully clockwise.

NOTE

During an alarm condition, the AUDIO LEVEL control setting has no

effect on the loudspeaker volume and the alarm tone is heard at full

ALARM SIL Switch

volume.

When pressed, silences (turns off) the 3-kHz aural alarm from the loudspeaker.

Section II. OPERATION UNDER NORMAL CONDITIONS

NOTE

The initial setup and adjustments for the monitor receiver are carried out by organizational or higher category

maintenance personnel. The initial setup procedure must be repeated if the monitor receiver is replaced.

CAUTION

Do not operate the receiver unless initial setup and adjustments are completed by higher category maintenance

personnel.

2-3 Initial Adjustments

The monitor receiver does not require any initial adjustments by the operator. However, perform the following

before switching on the monitor receiver:

a. See that the power cord is connected to the receiver, and plugged into a grounded ac outlet.

b. See that the antenna cable connector is properly mated with J1 (RF I/P 50 ohm) at the rear of the

receiver.

c. See that the remote alarm contacts at TB1 (rear of unit) are properly wired for remote monitoring. Terminals

TB1 (5-4) are normally open (NO contacts and TB1 (4-3) are normally closed (NC)) . If remote alarm indication is

not required, do not use TB1 (3, 4, 5).

d. See that the 600-ohm audio line (if used) is connected to TB1 (1-2).

2-4. Operating Procedure

a. Set power ON/OFF switch to ON. Check to that POWER indicator (green) lights and indicating fuse are off

(not lighted)..

b. Set AUDIO LEVEL control to the desired volume from loudspeaker

c. Check to see that the ALARM light (red) is off and NORM light (green) is on.

d. Check to see that the CARRIER LEVEL meter reads 0 +1 db. During normal operation this reading (0 +1

db) must be obtained at all times.

e. If the condition specified in steps a through d above are met, the receiver operation is normal. If any results

are not satisfactory, refer to chapter 3

2-5. Alarm Condition

If the, carrier level and/or modulation of the received signal falls below the present threshold alarm condition will

be generated as follows:

a. ALARM lamp(red) comes on.

b. NORM lamp (green) goes off.

c. A loud 3-kHz tone is presented on the loudspeaker.

2-2