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TMAA04-06 Cross-band Linking, GPS and External Interface Cable
© Tait International Limited February 2021
Radio Programming
Programmable I/O and Audio Settings
At a minimum, settings in Table 1, Table 2, and Table 3 must be programmed for both radios.
Notes:
1. Select Busy Status and Busy Detect to re-transmit any signal.
2. Select Signalling Audio Mute Status and Busy Subaud to decode valid signal-
ling only. This is recommended if the repeater is to operate on an RF channel that
requires valid subaudible signalling. Otherwise the radio may re-transmit short bursts
of activity when a channel is busy but not captured due to invalid activity.
Receive and Transmit Settings
The cross-band repeater receives signals based on the radio’s squelch (carrier) mute, and re-
transmits signals based on external PTT 1. If programmed to only re-transmit valid signals,
the radio’s signalling mutes are also taken into account, which are affected by the radio’s
monitor function (e.g. hookswitch monitor when the microphone is off the hook). If monitor
settings are programmed, the radio user must not enable monitor (having the microphone off
the hook) while entering, or during, cross-band repeater mode.
The transmit timer, if enabled, limits the maximum duration of cross-band repeater
transmissions. If a transmit lockout period is programmed then further repeater transmissions
will also be inhibited until the lockout timer expires. However, if a valid received signal is
present when the lockout timer expires, then the radio does not automatically resume
transmission. The received signal must first drop and return before re-transmission resumes.
Table 1 Cross-band settings in the Programmable I/O form, Digital tab
Pin
Mode
Direction
Label
Action
Active
Debounce
AUX_GPI1
Conventional
Input
XBAND_TX Repeater Tx Input
Low
10
AUX_GPIO5
Conventional
Output
BUSY
Busy Status
1
Low
None
Signalling Audio Mute
Status
2
Table 2 Cross-band settings in the Programmable I/O form, Audio tab
Pin
Tap In
Tap In Type
Tap In Unmute
Tap Out
Tap Out Type
Tap Out Unmute
Rx
None
A-Bypass In
On PTT
R7
D-Split
Busy Detect
1
Busy
Subaud
2
EPTT1
T5
A-Bypass In
On PTT
None
C-Bypass Out
On PTT
Table 3 Cross-band settings in the PTT form, External PTT (1) tab
Field
Setting
Advanced EPTT1
PTT Transmission Type
Voice
Audio Source
Audio Tap In
