TA2922 Universal Line Interface Service Manual 31
© Tait Electronics Limited March 2010
Unbalanced line in audio to transmitter (referenced to ground). This input cannot
be used when link LK4/R62 is fitted for 2-wire line operation. See “Additional
configuration links” on page 38.
The frequency response and filtering of the signal of the signal depends on the
configuration of the AUD_TAP_IN as defined in the programmable audio options
of the radio. See “Programmable I/O form, Audio tab” on page 40. The
frequency response of this line through the TA2922 board is from 50Hz to 3kHz.
N LINE OUT UNBAL
■ Signal direction: output
■ Signal level: 25mV to 1V RMS
■ Signal impedance: 100 ohms
Unbalanced line out audio from receiver (referenced to ground). The frequency
response and filtering of the signal of the signal depends on the configuration of
the AUD_TAP_OUT as defined in the programmable audio options of the radio.
See “Programmable I/O form, Audio tab” on page 40.
The frequency response of this line through the TA2922 board is from 100Hz to
3kHz into 100 ohms, or 50Hz to 3kHz into 600 ohms. This output can be used
to drive low power audio loads such as headsets.
If the RX line out audio source is set to use ‘RX_AUD’ as defined in the option
board software programmed configuration, the audio level out of LINE OUT
UNBAL can be varied in level according to the control head volume control. See
“RX Line Out uses RX_AUD” on page 43.
Note that in some remote head and multi-head radio configurations, the
RX_AUD line becomes fixed in level and is not varied with the control head
volume control.
OGATE OUT DIRECT
■ Signal direction: output
■ Signal level: 45VDC max
■ Signal impedance: < 10 ohms
Un-isolated open collector RX gate output, active (pulled to DC ground) when
radio is receiving a valid signal. Maximum voltage on this line should not exceed
45V, maximum current sunk when active is 70mA. No pull-up resistors are fitted
as standard, but an option to fit pull-ups to 3.3V or 13.8V is provided.
P PTT DIRECT
■ Signal direction: input
■ Signal level: 5VDC max
■ Signal impedance: 5k ohms
Un-isolated TX gate output, active low. Has internal pull-up resistor to 3.3V, radio
transmitter is keyed when the input voltage is pulled below 2.5V. Suitable for direct
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