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HISTORY
Commencement of service 07/04/1990
Tx & Rx
Alford slots. gain approx 6dB - horizontal
polarization
Antenna height 10m AGL
(92m ASL)
Antenna feeders
LDF 450A.
Tx exciter W & D
driving Mitsubish "brick" at approx 12W output from Filter.
Rx
W & D commercial receiver.
Testcard & caption generator .
Cropredy with PAL adaptor.
Bespoke cmos logic contol.
Major upgrade
10/1991
New tower to increase antenna heights to
22m AGL (104m ASL)
Antenna Feeders replaced with
LDF 550A
4 sector antennas added ((Swiss
quads) giving 10dB Rx gain to increase Rx & combat CAA radar
interference.
Logic upgraded to give DTMF control of
antennas and other functions.
Analogue style electronic S.meter to display
received signal level.
Complete re-housing into 19"
rack.
Repeater in use pilot tone (20KHz @-10dBr)
added to Tx audio .
1994 ?
Low level (-25dBc ) 6.5 MHz audio subcarrier to carry talkback added +
433.4MHz FM Rx & ant.
1996 ?
10 GHz receiver gateway (omni slotted wavguide antenna) added
06/2000
Computer added to display photos and other info in an easily editable
manner.
01/2002 1248
Mhz Receiver replaced with custom modified MPT
1392 unit
Failures : 2x
Video switcher IC's - replaced
Original Tx driver
transistor failed after 1st week (15/04/1990)- replaced with
higher power component.
Rx antenna selector relay
- box flooded
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The feed is from the QTH of G0LGJ in Dereham Norfolk. You will Need JAVA enabled on your browser to watch the above. QRZ on 433.400 and or 144.750 for talkback if in range also can be contacted on ECHOLINK node G0LGJ-L 121499 for talkback if required. If you would like to watch this truly live instead of connecting to the net, then drop me a line. Also look at the coverage map and see if you are in the coverage area. GB3TN is operated by the North Norfolk Repeater Group Donations to G0FVF (QTHR) The Group wish to thank all those who contributed designs components, materials and time, The Repeater Management Committee.
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