DMR Technology, FAQs and links


GB7TC Update for 2018/2019

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)



This is user activated, introduction and more information from https://wiki.brandmeister.network/index.php/What_is_BrandMeister


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.

Talk Group
Name
1
TG1
World Wide Calling (Always Linked)
1
TG2
Europe Calling (Always Linked)
1
TG9
Local (Secondary)
2
TG9
Local (Primary)
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
1
TG6550
Link To Brandmeister TG655 (South Africa) (User Activated)
2
TG9990
Echo Server

Roaming Talk Groups

Roaming TG are used to access the DMR repeaters in another region, for example, from GB7TC calling someone in Scotland.

Slot
Talk Group
Name
2
801
South East
2
810
South West
2
820
North West
1
821
GB7FW , GB7LP
1
822
GB7BR , GB7CA , GB7PN
2
830
Midlands
2
840
East England
2
841
GB7AL, GB7CT, GB7DS , GB7FU GB7MK , GB7ND, GB7WS
2
842
GB7CT, GB7EX, GB7FU GB7HA
2
844
GB7FU, GB7IN, GB7RE, GB7SK
2
850
Scotland
2
860
North East
2
862
GB7EL, GB7HS, GB7HX, GB7LE, GB7MR, GB7RV, GB7TD
2
870
Wales
2
880
Northern Ireland

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 show the status of the UK (and some Dutch) DMR repeaters, also the traffic on the links to Wires and Brandmeister networks.


I use it to monitor and also see who is active!

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 3G 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:
5050 = without SSID
5055 = House QTH
5056 = Camping
5057 = walking with handheld radio
5058 = boat
5059 = car

Please see http://www.opendmr.net/index.php/anytone-d868uv-gps/ for set-up and configuration details.

DV4Mini and other Dongles


The reflector groups linking is currently

Reflector
NAME
TG
Slot
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
4430 (Midlands)
TG830
830
2
4440 (East England)
TG840
840
2
4441 (East England 1)
TG841
841
2
4442 (East England 2)
TG842
842
2
4450 (Scotland)
TG850
850
2
4460 (NE England)
TG860
860
2
4470 (Wales)
TG870
870
2
4480 (Norther 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 g8vri@rrg.org.uk

Explanation  and full list of talk groups and time slots on GB7TC can be downloaded here

For further information and more detail see www.dmr-uk.net

TYT MD380

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. For more information see link: .Linear Amplifiers and DMR.pdf

HYTERA MD785G

Hytera MD785G User Manual "note this is the full manual not the short version that comes with the Tranceiver" (please click the link below)
https://www.dropbox.com/s/mgwkymxctdvqr87/Hytera%20MD785G%20User%20Manual.pdf?dl=0

Hytera MD785G  "Guide to the codeplug & programming" (click the link below to view)
https://www.dropbox.com/s/ygjgornkntny3pi/Hytera%20DMR%20CPS%20Guide%201.pdf?dl=0


Please send any contributions to this page to g8vri(at)rrg.org.uk

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