GAI-Tronics IDA1000A DC Remote Adapter Installation and Service Manual - Manual (Page 15)

Model IDA1000A DC Remote Adapter Installation
11 01/05
Radio Connections
Radio connections are made via P1. See Figure 4 on page 13. The supplied radio cable can be removed
if not needed, and a connector or terminal appropriate for the station used can be installed.
Receive Audio – P1-11, Audio Ground; P1-3, to de-emphasized RX audio source.
This input uses dc blocking capacitors on each side; reference level input at 2/3 radio system modulation
is 600 mV ac. Receive “audio in” can be configured for balanced or single-ended audio.
• If balanced, both pins should be connected. If single-ended audio is used, P1-11 should be grounded
to audio or chassis ground.
• Receive input audio can be configured for 32 to 150 mV ac, 150 to 400 mV ac, 400 mV ac to 1.7 V
ac, or 1.7 V ac to 4.5 V ac using SW1-3 and JU3. See the Jumper Position Table on page 15.
• To determine the correct setting, measure the receive audio output with 2/3 maximum deviation
applied where pins P1-11 and P1-3 will be connected.
Mic High and Mic Low – P1-12, Hi; P1-4, Low
This output uses a dc blocking capacitor. P1-12 goes to the capacitor’s + side and is connected to the
station transmit audio. Common mode noise is detected by internal circuitry, correcting the mic high
signal.
• The return, P1-4, should connect to mic low or station audio ground.
• The reference output is 80 mVac into 560 ohms.
Duplex Control – P1-2
This is an input that routes radio supervisory talk permit and button-acknowledge tones to the adapter.
Connect to RX audio enable high/disable low output from the radio.
F1 – P1-8
In a multi-frequency radio, connect to the F1 oscillator ground or enable. In single-channel radios, this
input is normally not connected. This uncommitted collector transistor switch is capable of driving 100
mA, and is Zener-protected to +5 V.
PTT Output – P1-13 Active High; P1-6 Active Low
Connect to radio station PTT (TX) input. These are uncommitted collector transistor switches, capable of
driving 100 mA maximum and Zener-protected to +15 V.
Monitor – P1-14 Active High; P1-7 Active Low
This uncommitted collector transistor switch is capable of driving 100 mA maximum and Zener-protected
to +15 V.
• Connect P1-7 to radio station monitor input if GND is required for monitor.
• Connect P1-14 if high is requested.
F2- P1-15
In a multi-frequency radio, connect to the F2 oscillator ground or enable. This is an uncommitted
collector transistor switch, capable of driving 100 mA maximum and Zener-protected to +5 V.