tait TMAA04-06 Cross-Band Linking GPS and External Interface Cable Instruction Manual

tait TMAA04-06 Cross-Band Linking GPS and External Interface Cable

Notice The TMAA04-06 cross-band linking, GPS, and external interface cable is DMR only. It is not currently supported by P25 radios.

The TMAA04-06 cross-band linking, GPS, and external interface cable is used to extend the features available with TM9356 dual radio systems. The cable connects to both radio’s auxiliary ports so the radio system can be used as a cross-band repeater, provides an RJ45 socket to connect to a GPS antenna, and also provides an external interface connector. The external interface can be used to power a TM9356 dual radio system on using ignition sense, and also connect to an external alert device.

Notice The radio does not meet the IP54 pro-tection standard once the auxiliary connector rubber bungs have been removed and this cable has been installed. Care must be taken when the radio is being operated in an environment where there is water, dust or other environmental hazards.

Analog Cross-band Repeater Operation
Cross-band repeater mode allows a TM9356 dual radio system be used as a temporary analog repeater. Any activity received on one radio will be automatically transmitted on the other radio, and vice versa.

Installation

1. Remove the rubber bung that cover the auxiliary connector on each radio body.
2. Plug an auxiliary connector into the auxiliary port of a radio body.
3. Plug the second auxiliary connector into the auxiliary port of the other radio body. The cable can be plugged in either way—its orientation has no impact on radio perfor-mance. However, to reduce the cabling required, orient the cable so the external interface connector and GPS socket are closest to the device or devices to connect to.
4. Tightly fasten the jackscrew-type locks.

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.

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 Status1| ****

Low

| ****

None

Signalling Audio Mute Status2

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 Detect1
Busy Detect + Subaud2
EPTT1| T5| A-Bypass In| On PTT| None| C-Bypass Out| On PTT

Notes:

1.  Select Busy Status and Busy Detect to re-transmit any signal.
2.  Select Signalling Audio Mute Status and Busy Detect + 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.

Table 3 Cross-band settings in the PTT form, External PTT (1) tab

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.

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 channels, there is a brief break in reception which will cause the transmit timer to restart. Squelch override is not compatible with cross-band repeater operation. Avoid programming this feature to a function key, and consider removing the menu option.

Transmit Inhibit

If both radios are receiving activity when cross-band repeater mode is activated, the radio system can rapidly cycle between transmit and receive. Set Tx Inhibit to Busy to prevent this from happening by not allowing the radio system to transmit when there is another busy signal. Alternatively, set different debounce times for each radio, which will separate each radio’s entry into cross-band repeater mode. If the cross-band repeater is programmed to only re-transmit valid signals, and one radio is receiving an invalid signal (such as invalid CTCSS), the mute will stay closed and no re- transmission will occur. However, if the other radio then receives a valid signal, the radio will attempt to re-broadcast this over the other signal. Set Tx Inhibit to Busy or Mute to prevent this re-transmission occurring.

System Timing
For the cross-band repeater to operate correctly with other base stations or repeaters, system timing must be taken into account. If using subaudible signalling and the transmitter requires a “tail”, then this can be configured according to Table 4. During the lead-out delay period, no signalling, such as CTCSS or DCS, is present.

Table 4 Transmit tail in the Basic Settings form, Subaudible Signalling tab

Operational Testing

1. Enable cross-band repeater mode.
2. On the receiving radio, inject an on-channel RF signal at a level of – 70 dBm, modu-lated to ±3 kHz deviation (wide bandwidth channel) or ±1.5 kHz (narrow bandwidth channel), at 1 kHz AF.
3. On the transmitting radio, the resulting deviation should be:
   • ± 3 kHz (with a tolerance of ± 200 Hz) on a 25 kHz wide bandwidth channel.
   • ± 1.5 kHz (with a tolerance of ± 200 Hz) on a 12.5 kHz narrow bandwidth channel.

Connecting to a GPS Device
The cable provides an RJ-45 socket, which is used to connect a TM9356 dual radio system to a GPS device such as a Garmin-16HVS antenna/receiver (product code TMAA05-01). GPS data is sent from the antenna to both radios.

Installation
Plug the GPS receiver/antenna directly into the RJ-45 socket. The socket is the correct type for the antenna, therefore the adaptor that is supplied with the GPS antenna is not required. For information on antenna mounting, refer to the instructions provided with your GPS device.

Radio Programming
Program one or both radios with GPS settings as required. For detailed configuration and programming information contact your local Tait dealer.

Connecting to the Ignition Signal
The cable’s external interface connector can be used to connect a TM9356 dual body radio system to the vehicle’s ignition signal. This will turn the radio system off when the ignition key is off to avoid draining the battery, and will turn the radio system on when the ignition key is on.

A TMAA04-05 ignition sense kit is available. The kit comprises a mating plug for the radio’s auxiliary connector and a 13 foot (four metre) length of cable to connect to the vehicle’s ignition signal.

Installation

Connect pin 4 of the external interface connector (AUX-GPI3) to the 13.8V signal controlled by the vehicle’s ignition key.

Make sure the ignition switch and the radio links LK1 and LK2 are properly configured to reduce the radio’s power consumption. Refer to the TM9300 Service Manual for more information.

Radio Programming
Program both radios as shown in Table 5.

Table 5 Ignition sense settings in the Programmable I/O form, Digital tab

Pin| Mode| Direction| Label| Action| Active| Debounce
---|---|---|---|---|---|---
AUX_GPI3| All| Input| IGN_SENS| Power Sense (Ignition)| High| 10

Connecting to an External Alert Device
The cable’s external interface connector can be used to connect a TM9356 dual body radio system to an external alert device in the vehicle. This enables both radios to drive the same external alert device.

Installation
The external alert lines used to connect to an external device are open collector outputs. Connect pin 9 (radio closest to connector) and pin 10 (radio furthest from connector) of the external interface connector to an input on the interface to the external alert device. Connect the pins together to drive the same external alert device. Connect the pins separately to drive separate external alert devices.

Notice The high current sink capability of the radio’s auxiliary lines cannot be accessed with this cable. That means you cannot connect directly to an external alert device—an interface to the external alert (such as a controller box) must be used.
Notice The internal pullups normally available from the auxiliary lines are not avail-able via this cable. If the external alert requires a logic-type signal on the output lines, the lines must be pulled up to a suitable voltage level by an external resistor.

Radio Programming
Program both radios as shown in Table 6.

Table 6 External alert settings in the Programmable I/O form, Digital tab

Pin| Mode| Direction| Label| Action| Active| Debounce
---|---|---|---|---|---|---
AUX_GPIO6| Conventional| Output| EXT_ALRT| External Alert 1| Low| None

Connecting to other External Devices or Signals
The cable does not currently support any other programmable I/O actions, or connection to other external devices or signals.

Interface Specification

The following tables summarise the signals used for all connectors on the cable, and shows the interfaces between the cable and the radios.
Auxiliary connectors—pins and signals

GPS socket—pins and signals

External interface connector—pins and signals

More Information
Please contact your nearest Tait provider for more information about this product.

TMAA04-06 Cross-band Linking, GPS and External Interface Cable © Tait International Limited February 2021

References

• Tait Communications | Your Critical Communications Partner

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