GB7CL: DMR Repeater

On the 15th December 2015, the Martello Tower Group were issued with an NoV for GB7CL, a 70cms DMR repeater to be located at the Martello Tower alongside GB3TE.


Things moved quickly and on the 20th December, GB7CL went on test, attached to a dummy load in G0MBA's workshop.  It remained there for a week before being moved to site and on Monday 28th December 2015, it was installed, connected to the internet and put on air.


On Wednesday 4th October 2017, GB7CL was moved to a new location near Thorpe-le-Soken.  This site is higher ASL than Clacton and is located roughly in the centre of our local area.  We hope that this location will allow good coverage throughout Clacton-on-Sea and the Tendring peninsula.  GB7CL is now a repeater that will cater for the local community.

On Sunday 24th June 2018 the aerial at the Thorpe site was raised by around 25ft (see picture below) and the coaxial cable replaced.  In theory this should only give a 3-5dB increase in signal but the practical effect is much higher as the aerial is now above any nearby obstructions with a much clearer view to the surrounding area.

From January 1st 2016 the repeater will be configured as follows:


Slot-1 TG9 = Local chat (Secondary)

Slot-2 TG9 = Local chat (Primary)

Slot-1 TG80 = UK wide 1 "user activated" Phoenix-UK

Slot-1 TG81 = UK wide 1 "user activated" Phoenix-UK

Slot-2 TG801 = Metropolitan East Phoenix-UK (GB7CL is under this region)

Slot-2 TG802 = Metropolitan West Phoenix-UK

Slot-1 TG803 = London Phoenix-UK

Slot-2 TG810 = South West Phoenix-UK

Slot-2 TG820 = North West Phoenix-UK

Slot-2 TG830 = Midlands Phoenix-UK

Slot-2 TG840 = East of England Phoenix-UK

Slot-2 TG850 = Scotland Phoenix-UK

Slot-2 TG860 = North East Phoenix-UK

Slot-2 TG870 = Wales & Marches Phoenix-UK

Slot-1 TG13 = World Wide English speaking D-Marc

Slot-1 TG1 = World Wide D-Marc



Channel: DVU51

Output: 439.6375 MHz

Input: 430.6375 MHz

Colour code: 3

Location: TM1941421801 - JO01ou

Repeater upkeep

There is no official repeater group for our repeaters but if you would like to make a donation to the Martello Tower Group group to help fund the repeaters (we have a regular monthly cost for the internet services used by GB7CL and GB7TE) then we will be happy to accept it.


You can donate either via post to the repeater keeper:


Tony Horsman, G0MBA

12 Hanwell Close,


Essex.  CO16 7HF


Or you can donate via PayPal.  All contributions are gratefully received and will go towards the upkeep of the repeaters and other projects undertaken by the Martello Tower Group.  Donations are not used for special event stations and DXpeditions.


You can see a list of everyone who has donated to help support the Martello Tower Group by clicking here.

GB7CL and GB3TE at the Thorpe-le-Soken site
The aerial at the Thorpe-le-Soken site

Martello Tower Group, 2009-2019