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28 TA2922 Universal Line Interface Service Manual

B GATE OUT 1

■ Signal direction: output

■ Signal level: 0 to 50VDC

■ Signal impedance: < 1 ohm

Isolated relay contact output. Normally configured to connect directly with

/GATE OUT 2 when radio receiver is in a busy state. Can be configured to output

+12VDC @150mA in a normally open or normally closed configuration,

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.

CGROUND

■ Signal direction: bidirectional

■ Signal level: 0VDC

■ Signal impedance: < 1 ohm

Connection to AC and DC ground. Maximum current on this line is 500mA

continuous or 1A for less than one second.

D /PTT IN 1

■ 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 or gate relay connection to +12VDC or DC

ground, depending on link population. See “Additional configuration links” on

page 38.

E LINE IN 1

■ Signal direction: input

■ Signal level: -30 to +5dBm

■ Signal impedance: 600 ohms

Half of the isolated balanced audio input line, paired with LINE IN 2. 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.

Tait TA2922 User Manual

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