GB3JB &-& Nr. Mere, South Wiltshire &-& IO81vc

2m &-& Channel RV63 &-& Input: 145.1875 MHz &-& Output: 145.7875 MHz &-& 25w (14 dBw) ERP

Motorola VHF DR3000 &-& TDMA DMR Tier II &-& Colour Code 5 &-& Slot 1 = TG9 + DOD TG’s &-& Slot 2 = TG950 = SWC

Loc: IO81vc &-& 745 ft (227m) asl &-& Single 3 dBD Collinear &-& Timeout 180 seconds &-& Part Of The South West Cluster


All the site systems are powered by Solar Panels and Wind Turbines, which operate at High Voltages.

During peak winter months when there is little direct sunshine and quite often not a lot of wind, GB3JB can suffer from power outages.

Tampering with any part of the installation could be dangerous.

The above image is provided by the ETCC, and a more detailed map can be found HERE.

Obviously, there are other 2m repeaters operational on RV63, and users should be aware that under some conditions GB3JB could suffer interference from users of these other repeaters.

It should also be obvious that users of GB3JB could well cause interference to users of these other repeaters.

It is good operating practice, to only use the power that you need to be able to access any repeater.  Therefore, if you only need 5 watts to access GB3JB, don’t use 50.

If you represent an Amateur Radio Group, Club or Society, etc., and feel that your members would like an introductory presentation on DMR TDMA technology and it’s capabilities, or would like to discuss the development of your own DMR TDMA repeater addition to the SWC, please feel free to contact G3ZXX via his email.

DMR TDMA technology is open-source with lots of manufacturers and consequently more choices in hardware and significantly cheaper prices.

FDMA technology D-Star and Fusion, for example, are proprietary.  No choice in manufacturers, they are incompatible with each other, and of course the industry approved technological standard is TDMA DMR.

Site Safety & Security.

Obviously, at a site with a relatively easy unauthorised public access, safety and security is a priority.

We therefore try to do our bit.  A couple of examples are shown opposite.

We have signs warning not to climb the tower.  Even though we have installed anti-climbing panels, idiots will always be idiots.

We have also provided warnings as to the use of 24 hour CCTV facilities on the site, which cover both the internal areas of the locked and secure barn and the external areas outside of the barn.

If you are not directly associated with the servicing and maintenance of GB3JB and it’s associated equipment and facilities, or directly associated with the farming of the land itself, you enter this privately owned site, totally at your own risk.

There is no public right of way across the site, and no unauthorised public access at any time.

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