RT Model Differences (Distinguishing Features)*

TM 11-5820-890-10-8

Microphone input impedance is 150 ohms.

MICROPHONE

Audio input (minimum) is 1.4 millivolts normal and 0.4 millivolts for

AUDIO

whisper (WHSP).

Squelch tone signal of 150 Hertz (Hz) is a part of all transmissions,

SQUELCH

except when FCTN is set to SQ OFF..

Receiver

Characteristics

2.1 c.

Radio frequency (RF) signal sensitivity is 0.35 microvolt

SENSITIVITY

25 KHz.

CHANNEL SPACING

Audio output impedance is 600 ohms (with handset at AUD/DATA or

AUDIO

AUD/FILL).

Receiver responds to 150 Hz tone with FCTN switch set to squelch on

SQUELCH

(SQ ON) or load (LD) when operating in SC mode.

Manpack receiver power draw is 225 milliamperes. Vehicular receivers

POWER DRAIN

draw: 0.762 amp for short range radio; 1.094 amp for short range/long

range radio; 0.942 amp for long range radio, and 1.524 amp for long

range/long range radio.

2.1d. RT Model Differences (Distinguishing Features)*

Control knobs are affixed with side- positioned Allen screws

RT-1523:

RT cover is affixed with slot-headed screws.

Last two digits of net ID may be changed by operator.

RT Mode switch is set to FH-M position to change net ID.

Sync time is loaded into RT manually via the keypad or by

electronic remote fill (ERF).

Running self-test with COMSEC in PT results in display message

of " AIL 5." (Changing to CT clears message.)

RT will accept ERF if sync time is less than +/- one hour different

from net sync time.

Figure 2-2. RT-1523 Features

2-4