TA2922 Universal Line Interface Service Manual 29
© Tait Electronics Limited March 2010
F LINE IN 2
■ Signal direction: input
■ Signal level: -30 to +5dBm
■ Signal impedance: 600 ohms
Half of isolated balanced audio input line, paired with LINE IN 1. 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. This input is used with 4-wire balanced configurations and is not used in 2-
wire configurations.
G /PTT IN2
■ Signal direction: input
■ Signal level: 10-50VDC to activate TX key input
■ Signal impedance: 5k ohm
Connection to input of TX key optocoupler. Between 10V and 50V DC is
required across the optocoupler input (normally between /PTT IN 1 and /PTT
IN 2) in order to activate the optocoupler. Input signal is bridge rectified so signal
is not polarity sensitive. Current input at 50V is 10mA. Can be configured for
permanent connection to DC ground, depending on link population. See
“Additional configuration links” on page 38.
H /GATE OUT 2
■ Signal direction: output
■ Signal level: 0 to 50VDC
■ Signal impedance: < 1 ohm
Isolated relay contact output. Normally configured to connect directly with /
GATE OUT 1 when radio receiver is in a busy state. Can be permanently
connected to +12VDC or DC ground, depending on link population. See
“Additional configuration links” on page 38.
Maximum voltage on this line is 50VDC when configured for clean relay contact
operation. Maximum current through relay contacts and PCB is 500mA
continuous or 1A for less than one second.
I LINE OUT 2
■ Signal direction: output
■ Signal level: -30 to +10dBm
■ Signal impedance: 600 ohms
Half of the isolated balanced audio output line, paired with LINE OUT 1. Audio
is from radio receiver which is optionally summed with line in audio when the
optional side tone adjustment pot RV3 is fitted. The radio RX audio to line output
level is adjusted by VR1. See “Setting line output level (VR1)” on page 24.
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