Argent Data Systems ADS-SR1 User Manual - Page 6

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Radio Interfacing

The RJ45 jack on the front panel provides all radio interface

connections. Looking into the front of the connector, the pin

functions, from left to right, are as follows:

8 - Power in (typically used with radios that provide a +8v output)

7 - Unused

- Audio in (from radio's speaker output)

5 - Push-to-talk output

4 - Ground

3 - Audio out (to radio's microphone input)

2 - Ground

1 - Squelch / COR input

The Squelch / COR input is optional. When this signal is available from the radio

(usually from an accessory or data connector) it allows the repeater to be

operated with the VOX delay.

The PTT mode must be set appropriately for the radio being used. Most base

station and mobile radios use a separate PTT input. Many handheld radios, with

the notable exception of most Kenwood models, combine the microphone and

PTT signals. For combined PTT models, DIP switch 4 in the ADS-SR1's battery

compartment must be set to the ON position. All other radios should have

switch 4 set to OFF.

Do not install batteries when using the optional RJ45 power input pin. The

DC jack, however, may be used while batteries are installed.

Audio Levels

For good performance, it is important to set both receive and transmit audio

levels correctly. The receive audio level is set using the radio's volume control.

To set it correctly, use another radio for testing. Transmit a test message in an

ordinary speaking voice and observe the red and green LEDs on the front of the

ADS-SR1.

The green LED will turn on when the audio level is about 75% of full scale. The

red LED is normally on and will switch off when the level exceeds 100%. Set the

volume of the radio connected to the ADS-SR1 so that the green LED flickers in

response to your voice, without the red LED dimming noticeably.