Welcome to the GB3SU webpage
First some history, GB3EA the 70cms repeater that we had that covered the Southampton area so successfully was lost in 2002.
"Our site is gone" (keeper) "GB3EA cannot be moved" (RSGB).
After much effort and finally in September 2006 we finally got permission to put a UHF repeater on the air in Southampton.
Co-sited with GB3SH, GB3SU is, as EA was, on 433.2 with a CTCSS tone of 71.9. It currently shares SH's antenna as the down spray 'commercial' UHF antenna (lots of money to buy) turned out to have all kinds of issues on this site (perhaps the UB alligator repeater could use it?).
2006 tech update from Andy G4MYS:
GB3SU uses a FTR5410B Yaesu Repeater, once again controlled by a very much modified GB3US mark 1 logic, the tone burst and carrier access has been removed, so 1750Hz access does not work. The repeater can only be used by stations using 71.9Hz CTCSS. This is due to us using a city centre site and the widespread use of licence free broad band RF generators: car fobs and all the other licence free (so called) 433Mhz stuff, which create an on going high noise floor. We thus we have to use CTCSS to control the squelch.
GB3SU does "pip" unlike SH which also aids mobile operators with twin band rigs to work out which one they have been called on !
The repeater is feed via RG 214 Twin braided coax to our 4" waycom duplexers, via more RG 214 to the 145MHz & 435MHz diplexer with the GB3SH signals to the same aerial, we hope still at 53 Metres above the ground.
Common aeral working gives several advantages: The signals from both can be compared!
GB3SU is on a temporary repeater while the full time machine has our new logic built tested and fitted, this is a G8CUL design, which has many interesting features. To avoid confusion we will tell you about them later, but for the curious go and look at the GB3OX web site !
GB3SU runs about 10 Watts ERP
For those that did not understand the delay, compared with the VHF repeater, car key fobs operate on 433.920 Mhz, some are prone to receiver overload/jamming and thats why (in part) UHF repeaters take so long to get on air. FYI Renault cars no longer have keys, its all done with a remote.....