TDMA – what’s that all about then ?

It’s not always obvious when you get into DMR exactly what makes DMR so ‘special’ and why everyone is jumping on the bandwagon, compared to most other types of digital voice modes, one of the coolest things about DMR over most other forms of digital voice modes is TDMA. that’s Read More

Introducing TAC-9

Now just what are they on about over there in the Bay area ? – and what’s all this TAC-9 business about anyway ? We largely started GB7MB to help ourselves, a few radio geeks up here, communicate between each other a little more easily on handhelds whilst we were Read More

North America Mototrbo CPS 12 build 642 bug.

Motorola released a caveat for North American users of CPS_12 build 642.. Motorola issued a ‘Field service bulletin’ because there is a serious issue some users are experiencing where after writing back to the radio using CPS 12 build 642 you lose ability to PTT. not good. It concerns subscriber Read More

MotoTRBO 2.4a updates

A few nice additions, probably of interest to most Amateurs is the Text to speech and the RSSI tweaks. The Text to speech will be a great leap forwards in accessibility for blind and partially sighted users. For more info, have a look at’s very nice slideshare.. here below Read More

Some good links..

Our Friends over at GB7HM – Hope Mountain DMR Users Forum   London DMR-MARC and C-Bridge GB7MB (us)  Facebook Group                         UK Digital Hams (professional digital voice modes only no dstar/Fusion)–Hax– All work, text and images © GB7MB

Busy, busy, busy!

We all lead a busy life, some more than others. GB7MB also has it’s own busy times, some of these are not due to QSO traffic but are caused by little glitches in the global DMR-MARC network. These manifest themselves as all talk groups and time slots being in use, Read More