Installation manual

Pin No. Purpose/Specification
9 Discriminator’s Audio Output; buffered unprocessed
(not de-emphasized) audio.
10 Interconnect RX Audio Output; buffered de-
emphasized receiver audio.
11 Data In; 4800 BAUD (2400 Hz) Maximum.
12 Remote Audio B. Not Applicable
13 External CG/DCG Input; modulates the
VCO/Reference Oscillator; External Encoding must be
selected for the Encode Tone.
14 Interconnect TX Audio Input; is pre-emphasized by the
Unit.
15 Interconnect Control Output; goes Low when User #16
tone is decoded (or if the External Decode pin is low).
MULTIPLE CG/DCG DECODE
The unit’s built-in decoder can be programmed to accept
up to 16 different user’s CG tones or DCG codes and prop-
erly decode each one. There can be any combination of
tones or codes as long as the total is not more than 16. User
No. 16’s tone or code is always associated with Interconnect
Control.
The tone or code that is actually transmitted is not the
original one received, but one that is re-generated by the
unit. The generated tone or code can be a different tone or
code, as determined by the unit’s configuration programmed
by the dealer. For example, if the CG tone received is No.
12 (100.0 Hz), the Unit can be programmed to transmit No.
18 (123.0 Hz) or even a DCG code. However, a received
tone (or code) cannot be re-generated for more than one
tone (or code), whether it is the same or different tone
(code). For example, if received tone No. 12 is to be re-gen-
erated as No. 18, it then cannot also be re-generated as No.
23 .
One of the 16 different tones or codes can be an input
from an external encoder. The external encoder signal has
priority over the Unit’s built-in encoder.
OPERATION
INITIAL
Turn on the unit. If squelch hasn’t been set yet, put the
unit into the Monitor Mode. If the yellow MON LED is not
lighted, press the MONITOR button. Set the Volume Con-
trol approximately to its 9 o’clock position. Then turn the
Squelch Control counter-clockwise until "noise" is heard.
At this time, the Volume Control can now be set for the
desired audio listening level. It can also be set later, when an
actual signal is being received. The Volume Control has no
effect on the transmitter audio.
Now turn the Squelch knob clockwise slightly past the
point where the noise just disappears. This is the proper po-
sition for all normal squelched operations. If "noise" is oc-
casionally heard, turn the Squelch Control slightly more
clockwise. If desired, the unit can now be taken out of the
Monitor Mode by pressing the MONITOR button. The
MON indicator should turn off.
GENERAL
If the unit is to be used as a self-controlling (receiver op-
eration) repeater, press the REPEAT button to light the REP
LED.
PTT OPERATION
The operation of the radio’s PTT function has 5 priority
levels (1 being the highest) as follows:
1. Local (front panel jack) microphone.
2. Remote, if enabled (REM LED on).
3. DATA (via DB15 connector).
4. Interconnect Control panel.
5. Receiver, if REPEAT Mode enabled (REP LED
on).
Continued
Figure 3 - DB15 Connector Pin Positions
- Rear Panel View.
AE/LZT 123 1899 R1B
7