Simplex Operation - Tait TB8100 User Manual

Simplex Operation

Scanning Repeater
Digital Inputs with Special Functions
196 Part I: Task Manager
IF Counter at maximum (Counter 1) THEN Start timer (Timer 2)
IF Counter at maximum (Counter 1) THEN Activate Digital
Output 6
IF Counter at maximum (Counter 1) THEN Reset counter
(Counter 1)
This set of tasks starts the lights timer, turns the lights on, and re-starts the
counter for detecting three presses of PTT.
IF Timer expired (Timer 2) THEN Deactivate Digital Output 6
This task turns the lights off when the 30 minutes has elapsed.
If the TB8100 is to be used as a simplex line-connected base station with an
antenna relay, the receiver must be disabled when the transmitter is keyed up.
This can easily be done using Task Manager:
IF PA keyed by Tx Key line THEN Disable receiver
IF NOT PA keyed by Tx Key line THEN Enable receiver
Testing this on your system may uncover a need to build in
Note:
some timing to ensure that the receiver is disabled before the
transmitter starts.
In a two-repeater site, Task Manager makes it possible for either repeater to
turn into a scanning repeater if the other repeater fails. The scanning repeater
handles both channels, providing a complete backup system.
When a repeater fails, the other starts scanning. It changes to a channel, waits a
few 100 ms, checks the received signal, and, if nothing is there, it goes to the
next channel. If there is a signal, it will just repeat it as usual, complete with all
the signalling and line output requirements for that channel. Here a single base
station is providing the same service but with a poorer throughput.
IF Base station in Run mode THEN Start timer (ChangeChannel)
IF Receiving valid signal THEN Stop timer (ChangeChannel)
IF Receiving valid signal THEN Stop timer (On Channel)
IF NOT Receiving valid signal THEN Start timer (On Channel)
IF Timer expired (ChangeChannel) THEN Go to next channel
IF Timer expired (ChangeChannel) THEN Start timer
(ChangeChannel)
IF Timer expired (On Channel) THEN Go to next channel
IF Timer expired (On Channel) THEN Start timer
(ChangeChannel)
This example is a straightforward scanner. It will search through all the
channels in the channel table looking for activity. A small variation on this can
make it stay on its home channel until an external signal triggers the scanning.
Task Manager tasks make it possible for digital inputs to have a great variety of
functions.
Subtone Decode Disable Pin
When digital input # is active, the base station disables the decoding of
subaudible signalling.
MB8100-00-00-806 © TEL 2003