GB3XG
BRISTOL'S 10GHz Amateur TV Repeater
GB3XG
the groups 10Ghz repeater uses a very advanced logic control system
based on a Motorola 8 bit “6809” micro. This was developed
by John Hudson G3RFL. The system has all the bells and whistles
that most users seem to expect these days, these being DTMF control,
numerous testcards. Since the recent change in frequency imposed
by the Department of trade and industry (DTI) it has taken a lot
of hard work to get the system up and running again.
The
following people must be thanked for all the hours of hard work
that they have put in over many months.John G3RFL (Logic hardware
& Software), Ivor G1IXF (Site Mechanical engineering works),
Ross G0WJR (Expensive test equipment facilities), Ian G6TVJ (Adivce
on all video matters) Tests have been conducted recently and the
coverage over to Wales appears to be particularly excellent, this
has in turn encouraged lots more interest in that part of the country.
To receive pictures from GB3XG is reasonably simple all you need
is a satellite RX and a modified Low noise block converter or
LNB for short. This is a device that takes the 10GHZ band and
shifts it down in to an IF which is then processed in the normal
way by the receiver. Converted LNB's are readily available from
Bob Platts G8OZP who advertises in CQ-TV.
![](art/slots2.jpg)
Above
close up detail of the Alford slot antenna used at GB3XG.
The
screen below is one of the testcard sequences that may be seen
whilst the repeater is in beacon mode awaiting an input signal.
![](art/gb3xgtc3.jpg)
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