Pub. 43004-027B
Model IDA1000A DC Remote Adapter Installation and Service Manual
Page 11 of 24
P:\Radio Products-Current Release\43004\43004-027B\43004-027B.docx
06/18
Radio Connections
Radio connections are made via
P1
(see Figure 5). The supplied radio cable can be removed if not
needed, and a connector or terminal appropriate for the station 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 the 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 Table 4).
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 mV ac into 560 Ω.
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.
