History of GB7HX
GB7HX started life as a D-Star digital repeater in 2011 on GB3HD frequencies, as the allocation of a new frequency was being held up by the MOD. After the first rush of users though GB7HX, the usage declined, so in 2013 it was decided to change GB7HX to the new DMR-MARC digital system. The D-Star repeater was sold to get funds for the new Motorola SLR 5000 repeater and this proved to be a good move. At the beginning of 2014, a new frequency slot was allocated to GB7HX allowing GB3HD to come back on air.
GB7HX is a digital repeater on the DMR-TDMA system, it is on the Northern DMR cluster network. It transmits on 439.575 MHz (your receive) and receives on 430.575 MHz (your transmit), the system in use is the Mototrbo TDMA ( Time Division Multiple Access.) This has two-time slots 6.25 KHz each, thus allowing two conversations to take place at the same time though the repeater with a 12.5 KHz channel spacing.
Northern DMR Cluster
The Northern DMR Cluster is a network setup by amateurs to interconnect repeaters all over the world, it consists of talk groups (please see list of available TG’s), that interconnects repeaters, local, UK wide, Europe and worldwide.
Being a commercial radio system it is not easy to set up, you need specialist programming software for different brands of radios and in some cases different models. There are lots of groups that will help you out, it is worthwhile asking around. Before you can work the repeater you will need the following: a DMR radio, you can obtain one on eBay, programming software, a code plug (due to the different manufacturers and models it is not possible for us to supply them) for your radio and your local area and finally an ID this can be obtained from
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Copyright Caroline G6ZWQ