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 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
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
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.
the DTMF receiver/controller:
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.
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
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.
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
select another input. (DTMF
Open 23cm input (was used for GB3HV relay)
Relay GB3EN (currently video
Beacon slide show/testcards with repeater details
North Tower Cam (toward Watford)
South Tower Cam (toward London)
meter display for 2340 MHz receiver
on screen ident. (Normally on)
Example, if GB3HV is being relayed, pressing BB4 will turn
off GB3HV and turn on the slide show.
slide show and cameras will have 77Hz CTCSS added to their
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
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:
O for ON (- -
-) or F for OFF. (. . - .)
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