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26 Apr 09

Users Guide...

Beacon Mode:

When not in use, the repeater will go to transmit every 10 minutes for 30 seconds with its video caption and audio call-sign in morse code. Otherwise the repeater is off.

In use:

When in use the repeater will give its call-sign, in Morse only every 10 minutes added to the users audio. The GB3BH ID, top right, will indicate in vision that the signal is coming from GB3BH. 

The repeater will automatically come on if it receives a signal on its input at 2340 MHz. This will override any other inputs that may have been selected unless the caption has been selected.

You can control the repeater by sending DTMF tones on 432.725 MHz. You will need a DTMF control that has numbers and letters e.g. 0123456789ABCD. First check that the repeater is hearing your 70cm signal.

Checking the DTMF receiver/controller:

With the repeater transmitting, send code AAB4, the repeater will reply by sending it’s callsign in Morse added to the audio to confirm that it’s hearing you. 
If the repeater can hear your signal but cannot decode the DTMF (i.e. incorrect DTMF level, distortion or your transmitter is off frequency) then the repeater will reply in Morse with T (-).

To switch to an alternative input or to activate the relay functions, use the DTMF codes shown below. The repeater will only switch to another input if there is a valid TV signal present; this avoids transmitting white noise from a receiver if no signal is present.

The input priorities are:

1st priority, 13cm Rx
2nd priority, 3cm Rx
3rd priority 70cm digital Rx.

Input 4 will be the only input with user access if a signal on 1, 2 or 3 is not present.

This input is controlled as follows:

Enable additional services:   AA04*      disable     AA04#

When the above has been enabled the following may be selected.

To select another input. (DTMF override)

Description (inputs)  

On Off
Open 23cm input (was used for GB3HV relay) BB1   
Relay GB3TZ BB2   
Relay GB3EN (currently video recording) BB3   
Beacon slide show/testcards with repeater details BB4   
North Tower Cam (toward Watford) BB5   
South Tower Cam (toward London) BB6   
S meter display for 2340 MHz receiver BB7  BB4
GB3BH on screen ident. (Normally on) BB4  BB8

Example, if GB3HV is being relayed, pressing BB4 will turn off GB3HV and turn on the slide show.

The slide show and cameras will have 77Hz CTCSS added to their audio.

So the only code to send to switch the repeater off overnight is AA04#
It will still come to life if a signal is present on the input.

Please switch off after use except the ident, leave it on.


When turning on or off an input the repeater will acknowledge a correctly sent command with the following idents: 

In Morse O for ON (- - -) or F for OFF. (. . - .)

Repeater failure or problems:

If the repeater fails or suffers problems while you are operating through it please call for a committee member on 144.750 if you get no reply please send an email to the committee members by clicking here and filling in details about the fault.  EMERGENCY