In the UK, we have access to several networks and clusters:
Phoenix UK (PUK), Brandmeister (BM), Northern DMR Cluster (NDC), SALOP Cluster, South West Cluster (SWC), FreeDMR, FreeSTAR and TGIF. Whilst talk group structures are similar in many cases (due to countries using a MCC related prefix – the UK is 234/235) and have always been specific to the network in use, due to network interlinking, some talk groups may be linked across one or several networks.
An important note: With the introduction of MMDVM repeaters, Keepers are able to have their repeaters connected to Dual Networks. There are a few of these repeaters in the UK, therefore it’s ideal to check the websites for both networks to see if your local repeater shows on both – if it is, try and locate the repeater website (I have listed as many as possible under the “Supporting Repeaters” menu) to see what the talk group layout is per time slot.
There is also Hubnet (https://www.hubnetwork.uk/), CQ-UK (https://www.cq-uk.co.uk/index.htm) and FreeSTAR (https://freestar.network/) which connect various modes including analogue repeaters, Allstar, Echolink, DMR, D-Star and System Fusion.
On most networks, TG9 is local – it does not go through the network/cluster and is much the same as using an analogue repeater however the calls will still appear on the networks live monitor and logs (if applicable). However, I am aware of a few repeaters being linked on Phoenix due to the location/coverage of the repeaters (GB7AS Ashford, GB7CF/GB7CK Folkstone and GB7DX New Romney) .
APRS users : this goes via 5057 on Phoenix (see network features on http://www.opendmr.net/), 234999 on Brandmeister and 9057 on the DV Scotland Network. None of the other networks/clusters pass APRSA throug h their system. It’s also possible for Keepers to switch off APRS on their repeaters so that the received packets do not pass through the network.
Here’s a map to the various networks (note that it’s not an official map and created from publically available information so there may be some errors) – DMR UK Repeater Map