Installation manual

POWER ON/OFF Switch
Power ON/OFF is a rocker switch. Press in at the top
end to turn the unit ON. Press in at the bottom end of it to
turn the radio OFF.
The indicator (LED) at the left end of the window (la-
beled POWER) should be lighted green when the unit is
ON.
VOLUME Control
Use this knob to vary the receiver’s audio output level.
This also varies the audio level to an external speaker.
SQUELCH Control
Use this knob to eliminate speaker noise when not re-
ceiving a transmission. For proper operation, turn the knob
counter-clockwise until noise is heard. Then turn the knob
clockwise until the noise just disappears.
MONITOR Button
Pressing this button toggles the unit into and out of the
Monitor Mode. When the unit is in the Monitor Mode, the
yellow LED labeled MON will be lighted. Also, any input
signal to the unit’s receiver can be heard, even if it has tone
coding such as CG or DCG.
REPEAT Button
Pressing this button toggles the unit into and out the Re-
peater Mode. The yellow LED labeled REP is lighted when
the Repeater Mode is enabled. The unit will NOT transmit
as a repeater unless the Repeater Mode is enabled.
REMOTE Button
Not used.
REM Indicator
Not used.
BZ Indicator
This green LED labeled BZ will be lighted whenever a
signal is received. In other words, the channel is busy (in
use).
TX Indicator
When the repeater’s transmitter section is activated, the
red indicator labeled TX will be lighted.
MULTIFUNCTION CONNECTOR
The female DB15 connector, labeled MULTIFUNC-
TION PORT and located on the rear panel, provides for in-
terfacing to a remote control device (DC, Tone or Local), an
Interconnect Control panel or for RS232 data input. See
Figure 3 for pin configuration. The purpose and/or specifi-
cation of each pin is as follows:
Pin No. Purpose/Specification
1 Ground
2 Remote PTT; a low (ground) will cause the Unit to
transmit with User No. 1’s tone and the Remote TX
Audio (Pin 7).
3 Remote RX Audio Output; buffered de-emphasized
receiver audio.
4 Data PTT; a low (ground) will cause the Unit to
transmit with Data In audio (Pin 11).
5 Interconnect PTT; a low (ground) will cause the Unit to
transmit with User #16 tone and the Interconnect TX
Audio (Pin 14).
6 Switched +13.8 VDC; provides a low current (less than
1 A) voltage source.
7 Remote TX Audio Input; is pre-emphasized by the
Unit.
8 Carrier Operated Signal (COS); output will be low
(transistor turned on) when the Repeater’s squelch
opens (breaks), regardless if Repeater’s audio is muted
or not.
Do not turn the knob to maximum clockwise posi-
tion. Turning the SQUELCH control significantly
past (clockwise) the threshold of quieting may ad-
versely reduce receiver sensitivity and communica-
tions range.
NOTE
When adjusting the squelch control, the Radio
should be in the MONITOR Mode.
NOTE
Continued
AE/LZT 123 1899 R1B
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