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SITE LAST UPDATED ON: Thursday, 12/03/2015 @ 01:37 UTC.

DVU37 - Output 439.4625 MHz - Input 430.4625 MHz.


GB7JB is funded solely by donations from its' users and supporters. There is no club or group to join and no annual membership fee. We rely totally on your good will.

The system is located in South Wiltshire, in IO81vc, co-sited with GB3JB, and provides coverage across South Wiltshire, South Somerset and North Dorset.

GB7JB is a 70 cm Digital voice repeater, based on DMR TDMA Mototrbo technology.
It provides TWO simultaneous channels. One is for local chatting, whilst the other is connected to the Regional Cluster / Network.

Thursday, 12 March 2015

GB7JB Operational.

Hi All,

GB7JB, became operational at approx., 4pm local time today, 11th March 2015.

It is running at full ERP into the planned antenna, which is currently in a temporary position, approx., 15 feet agl.  The site being approx., 745 feet asl.

We are awaiting the final installation of the antenna on the tower.  I will of course keep you up to date with developments.

Signal strength and activity reports will be much appreciated, via: gb7jb.dmr.repeater@gmail.com

The operational characteristics are as follows:
  • Channel / Frequency:  DVU37 - Output 439.4625 Mhz - Input 430.4625 Mhz
  • Mode:  DMR - TDMA
  • Slot 1: Local Coverage - Talk Group 9 - Colour Code 1
  • Slot 2: Regional Cluster - Talk Group 950 - Colour Code 1

The Regional Cluster also includes GB7AA, GB7BS, GB7DR, GB7SD.  All 5 repeaters are inter-linked.

To the left of this posting, you will see computer predicted coverage maps for both GB7JB and the Regional Cluster.

I would like to convey my thanks to all the individuals and clubs, that so willingly donated towards the GB7JB project, as well as those who have provided both technical and moral support.  GB7JB is on air thanks to your enthusiastic support and encouragement.

Thank you.

We still have a little way to go, but I think I can safely say, we are 90% there.

As some of you will know, I have been slowly upgrading the site CCTV system.  This is now more or less complete, with an additional 4 cameras and an upgraded storage / live audio and video streaming system having been installed.

This work is being carried out in conjunction with the site owner, who is spending a not inconsiderable amount on upgrading the facility, to include new structural security measures.

Cheers & 73's
Dave, G3ZXX.


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