GAI-Tronics ITA2000A ITA2000A Series Tone Remote Adapter with Scanning User and Installation Manual - Manual (Page 22)

Installation ITA2000A Series Tone Remote Adapter
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Transmit Audio – Pin 12
Connect this single-ended output to a microphone input circuit or exciter input of the transmit section.
The radio should be capable of a level from 32 mV
RMS
to 800 mV
RMS
.
Receive Audio – Pin 3 RX High (+), Pin 11 RX Low (−)
Connect to a speaker or detector audio source from a radio receiver capable of supplying a level in the
range of 250 mV
RMS
to 4.5 V
RMS
. Ensure that SW2-1 is set properly.
N OTE : It is best to connect to a point not controlled by a volume potentiometer to avoid the receive
audio being affected by someone adjusting the volume control.
If connecting to a volume potentiometer, connect to the high side so the level can not be changed.
Connect pin 11 to audio ground (AGND) if a receive return is not provided. Pin 11 should be shorted
with Pin 4 on the radio connector.
Push-to-Talk (PTT) Output – Pin 6
This output must be connected to a point in the radio that causes it to transmit when active. When this
input on the radio is active, ensure that the microphone input circuit where the transmit audio of the desk
set (pin 12) is connected will be active also.
Monitor – Pin 7, Pin 14
These pins provide a closure output for receive PL/DPL disable (monitor), and is activated when the
ITA2000A decodes a function tone of 2050 Hz from a tone remote desk set when in Conventional mode.
These pins are activated by a channel steer sequence until a PTT or scanning is resumed in Scan mode.
Connect to the radio receive PL/DPL disable input so the radio will go into carrier squelch mode. Since
this connection is a closure, one side of the closure can be connected to B+ or ground, depending on the
desired activation function logic. If receive PL/DPL disable is not supported by the radio, or is not
desired, disregard this connection.
Carrier Detect Input – Pin 2
The ITA2000A can be set up to accept an active low or high logic level for routing radio audio to
accessory and remotes when carrier is detected. Connect pin 2 to a radio output that goes active when a
valid receive carrier is present.
Carrier and PL/DPL Detect – Pin 10
Connect pin 10 to an output in the radio that goes active when a valid receive carrier and PL/DPL is
present. This indicates channel activity when the radio has been placed in monitor mode.
Push-to-Talk (PTT) Sense Input – Pin 13
Connect pin 13 to a point in the radio that goes active (set by SW1-3) when the radio is keyed from a
source other than the ITA2000A. When the ITA2000A senses the radio is keyed, it holds off any remote
or accessory transmit until the PTT sense clears.
N OTE : If this function is not available, disregard this connection.
Channel Select – Pins 1, 5, 8, 9, and 15
Connect pins 1, 5, 8, 9, and 15 to the points in the radio that will cause it to change channels when the
active logic is present. The active level of these outputs can be set to active low or high as determined by
jumpers JU3 through JU7.