GB7BK is located at Aldworth in Berkshire approximately 17Km North West of Reading. The locator square for this repeater is IO91JM

 

Technical !

Channel DVU59
Transmit Frequency 439.7375
Receive Frequency 430.7375
Antenna Stacked Dipoles
ERP 14dBW (25W)
Access Method Colour Code 3
Basestation Motorola DR 3000
Coverage Click here to view predicted coverage (60k). Plots provided by the ETCC
    berkshire uhf dmr
amateur repeater
 

FIRST TVRG DMR REPEATER GB7BK NOW ON AIR

On the 12th September 2015, the first DMR (Digital Mobile Radio) repeater operated by the TVRG became operational. This is a UHF repeater with the callsign GB7BK and is co-sited with the VHF analogue repeater GB3RD on a site about 11 miles WNW of Reading town centre.
The philosophy with DMR repeaters is that they are part of a network, in this case the DMR MARC network. MARC stands for Motorola Amateur Radio Club, who originated the concept.
The subject of DMR is quite involved and information can be gleaned for a number of sources. Initially for more information, take a look at
www.cc-3.net which is a website run by the people who run the DMR-MARC network in the U.K.
A basic overview:- A DMR transmission occupies a 12.5kHz bandwidth channel but can carry two simultaneous separate transmissions, thus being spectrum efficient. The transmissions uses two timeslots to achieve this. The DMR-MARC repeaters are all connected to the internet and this allows connection to the various talkgroups. Talkgroups are effectively virtual places where users can go to and talk to other users on the same talkgroup.
GB7BK offers access to following talkgroups on the two timeslots. These are the same for most DMR MARC repeaters but a few have additional local geographical talkgroups.
Click here for more information about GB7BK.

 

Repeater Keeper

The repeater keeper for GB7BK is Baz(G8DOR)
If you wish to contact the keeper please e-mail g8dor@tvrg.org.uk. Any other queries about the Thames Valley Repeater Group should be e-mailed to the relevant member who's details can be found on the contacts page

GB7BK Talk Groups
Timeslot
Talkgroup
1
TG1 – worldwide. Use as a calling channel then use one of the user activated (UA) talkgroups (TG119 or TG129) to continue a contact.
1
TG2 – Europe wide. Use as a calling channel then use one of the user activated (UA) talkgroups (TG119 or TG129) to continue a contact.
1
TG13 – English speaking worldwide. Use as a calling channel then use one of the user activated (UA) talkgroups (TG113 or TG123) to continue a contact.
1
TG235 – U.K. wide. Use as a calling channel then use one of the user activated (UA) talkgroups (TG113 or TG123) to continue a contact.
1
TG113 and TG123 – User activated groups that should be used when contact has been established on TG1 or TG2
1
TG119 and TG129 – User activated groups that should be used when contact has been established on TG13 or TG235.
2
TG8 – regional South East talkgroup – strangely with the addition of the Norwich repeater and one in Lincolnshire.
2
TG9 – local.