Welcome to the Amersham and Tring Repeater Group

Amersham site IO91QP

  • GB3AM Repeater output 50.840 MHz, input 51.340MHz, CTCSS C 77Hz
  • GB3AL  Repeater output 145.7375 MHz, input 145.1375 MHz, CTCSS C 77Hz
  • GB3AU Repeater output 433.175 MHz, input 434.775 MHz, CTCSS D 82.5Hz
  • GB7AU Repeater output 439.700 MHz, input 430.700 MHz, D-Star & Yaesu System Fusion (not Wires-X linked) APRS Disabled
  • GB7WL Repeater output 439.4625 MHz, input 430.4625 MHz, colour code 3, DMR (Phoenix Network) APRS Disabled

Tring site IO91PS

  • GB3TU Repeater output 433.225 MHz, Input 434.825 MHz, CTCSS C 77Hz
  • GB7CT Repeater output 145.6375 MHz, input 145.0375 MHz, colour code 3, DMR (Phoenix Network)
  • MB7FM Simplex 70.4375 MHz CTCSS C 77Hz required, please NOTE it currently has a 60 second time out
  • GB3BAA Beacon 50.016 MHz off air
  • GB3BAA Beacon 70.016 MHz off air


  • 27 August 2021 MB7FM:- back up at 14:08

  • 31 July 2021: GB7AU:- The previous D-Star repeater replaced by a MMDVM repeater, installed and operational on D-start and Yaesu System Fusion.

  • 10 July 2021: GB7WL:- installed and operational on DMR.

Repeater Group

  • Chris G0WTZ NoV holder and Tring Digital repeater support
  • Jon G4MDC and John G3VHH Amersham and Tring Analog repeater support
  • Chris 2E0UCW and Eric G6FGY Amersham Digital repeater support

Thanks to

  • John G8SYD – For donating the 4G router for the Amersham site to support GB7AU & GB7WL
  • Paul G7KBR – For donating a spare 4G router for the Amersham site to support GB7AU & GB7WL
  • Eric G6FGY – For funding this project
  • Rob M0ZPU – For donating the mobile radios for the MMDVM repeater
  • Paul G7KBR – For building the repeater and providing technical support
  • Chris 2E0UCW – For sorting out the logistics and installation of the repeater
  • Chris 2E0UCW – For funding this project, sorting out the logistics and installation of the repeater
  • Paul G7KBR – For donating some of the hardware, building the repeater and providing technical support
Donations Donations towards the site fee’s, equipment and 4G internet are always welcome – you will find a PayPal button on the top right of the website where you can send a once off or monthly donation to the group. A PayPal account is not required to send a donation – there is an option to use a card.


Our web site name is derived from the frequency of the sub-audible tone (CTCSS) that is used for the analogue repeaters of 77Hz Note (GB3AU) is 82.5Hz to avoid interference from other repeaters.

Some useful links

UK Repeaters
Phoenix Network
DMR Guide UK
Yaesu System Fusion
YSF Reflector List
YSF FSC Reflector List

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