582 TMAA04-06 Linking and Interface Cable TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
31.1.2 Radio Programming
Programmable I/O
and Audio Settings
At a minimum, settings in Table 31.1, Table 31.2, and Table 31.3 must be
programmed for both radios.
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 (such as the
hookswitch monitor when the microphone is off the hook). If monitor
settings are programmed, the radio user must not enable monitor (such as
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.
Priority scanning also affects the transmit timer during cross-band repeater
transmissions. If a non-priority channel in the group is captured, the radio
will re-transmit that activity and the transmit timer will begin counting
down. However, each time the radio samples the priority channel or
Table 31.1 Cross-band settings in the Programmable I/O form, Digital tab
Pin Mode Direction Label Action Active Debounce
AUX_GPI1 Conventional Input XBAND_TX Crossband Tx Input Low 10
AUX_GPIO5 Conventional Output BUSY Busy Status
1
Low None
Signalling Audio Mute Status
2
Table 31.2 Cross-band settings in the Programmable I/O form, Audio tab
Pi n Tap I n Ta p In Type Tap I n Unm u t e Tap O ut Tap Out Type Tap O ut Unm u te
Rx None A-Bypass In On PTT R7 D-Split Busy Detect
1
Busy Detect + Subaud
2
EPTT1 T5 A-Bypass In On PTT None C-Bypass 0 On PTT
1. Select Busy Status and Busy Detect to re-transmit any signal.
2. Select Signalling Audio Mute Status and Busy Detect + Subaud to transmit valid signalling only. This is
recommended if the repeater is to operate on a scan group where member channels require 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.
Table 31.3 Cross-band settings in the PTT form, External PTT (1) tab
Field Setting
Advanced EPTT1 PTT Transmission Type Voice
Audio Source Audio Tap In
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