Changes to DMR in the last few months have included Talk Groups (TG) to link with other Amateur Radio Digital Modes.
New Talk Groups
TG2351 YSF CQ-UK WIRES-X LINK (USER ACTIVATED)
TG2353 LINK TO BRANDMEISTER TG2353 - USER ACTIVATED
TG260 USER ACTIVATED LINK TO POLISH NATIONAL TALKGROUP
TG260 is now available on slot 1 as a user activated group on all Phoenix UK repeaters. This will allow access to the Polish national talk group. For a QSO please move to user activated TG113 or TG123.
Summary of current Talk Groups available on GB7TC
All except TG9 are also linked through the Phoenix Internet based core links World Wide.
|1||TG1||World Wide Calling (Always Linked)|
|1||TG2||Europe Calling (Always Linked)|
|1||TG13||World Wide English Calling (Always Linked)|
|1||TG80||UK Wide - User Activated 1|
|1||TG81||UK Wide - User Activated 2|
|1||TG82||UK Wide - User Activated 3 (Optional)|
|1||TG83||UK Wide - User Activated 4 (Optional)|
|1||TG84||UK Wide - User Activated 5 (Optional)|
|1||TG113||World Wide English - User Activated 1|
|1||TG119||World Wide - User Activated 1|
|1||TG123||World Wide English - User Activated 2|
|1||TG129||World Wide - User Activated 2|
|1||TG235||UK Wide Calling (Always Linked)|
|1||TG2351||CQ-UK Wires-X Link (User Activated)|
|1||TG2353||Link To Brandmeister (User Activated)|
|1||TG260||Link To Polish National Talk Group (User Activated)|
|1||TG6550||Link To Brandmeister TG655 (South Africa) (User Activated)|
ROAMING TALK GROUPS
Roaming TG are used to access the DMR repeaters in another region, for example, from GB7TC to call someone in Scotland.
MONITORING THE DMR NETWORK
Local monitoring of GB7TC
This shows who is using GB7TC, by following links you can monitor an individual call sign or switch to other DMR repeaters.
Monitoring the UK DMR network
This shows the status of the UK (and some Dutch) DMR repeaters, also the traffic on the links to Wires and Brandmeister networks.
Monitoring the UK Hotspots
Checking the internet link from GB7TC
If you use the echo TG9990 and it fails to echo audio, then the link is down or there is a core issue. In most cases this will resolve within a few minutes as the link from GB7TC to the internet uses 4G technology and it re-initializes occasionally.
GPS TO APRS
For those getting to grips with GPS to APRS. There are a few different private talk groups you can send the data to which produce different behaviour on APRS.
|RRS & Radio IDs|
|5057||Walking with handheld radio|
DV4MINI AND OTHER DONGLES
The reflector groups linking is currently as follows:
|4400 (UK Calling)||TG235||235||1|
|4401 (UK - Chat 1)||TG80||80||1|
|4402 (UK - Chat 2)||TG81||81||1|
|4403 (UK - Chat 3)||TG82||82||1|
|4404 (UK - Chat 4)||TG83||83||1|
|4405 (UK - Chat 5)||TG84||84||1|
|4409 (CQ-UK WIRES-X)||CQUK||2351||1|
|4410 (SW England)||TG810||810||2|
|4420 (NW England)||TG820||820||2|
|4440 (East England)||TG840||840||2|
|4441 (East England 1)||TG841||841||2|
|4442 (East England 2)||TG842||842||2|
|4460 (NE England)||TG860||860||2|
|4480 (Northern Ireland)||TG880||880||2|
|4491 (SE England)||TG801||801||2|
If there is anything else that you would like explained, send me an e-mail firstname.lastname@example.org
Explanation and full list of talk groups and time slots on GB7TC can be downloaded here
For further information and more detail see https://www.dvscotland.net/home
The Tytera MD380 DMR/FM handportable has become popular with a lot of radio amateurs. The latest code plug with GB7TC included can be downloaded here md380-rt3-swindon.rdt
At a cost of less than £80 it has proven to be a useful entry to DMR with good audio reproduction, easy programming, great battery life and a solid construction. The only downside seems to be the poor selectivity in the receiver front end. All in all a great starter radio.
USING RF POWER AMPLIFIERS WITH DMR TRANSCIEVERS
The general concensus is ‘DON’T!’ The switching speed and rise/fall time requirements for TDMA far outstrip the capabilities of most external RF (linear) Power Amplifiers.
Hytera MD785G User Manual “note this is the full manual not the short version that comes with the Tranceiver”
Hytera MD785G CPS Guide “Guide to the codeplug & programming”
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