GB3ER 70cm FM / C4FM Voice Repeater

GB3ER is the primary UHF voice repeater for Essex. Historically it was the first system to be installed by ERG. Based at Danbury Hill near Chelmsford, its central location makes it ideal for coverage of the middle of the county. Earlier units used Mk2 CUL logic, whilst ER-4 is based on a Yaesu Fusion repeater. The antenna system is fed via a 6-cavity diplexer from Procom/Telewave for single aerial working.

Status: RF On - ER-4 in service

Frequency 434.675MHz Input, 433.075MHz Output, Channel RB3 (RU246)
Transceiver Yaesu DR-2XE Fusion Repeater
Access Continuous CTCSS-Only, Tone-H 110.9Hz, or Fusion C4FM
Power 25W erp
Antenna Procom 5dB Colinear
NGR TL 779 050
Locator JO01GR
Antenna Height 110m above mean sea level (Base of mast is 100m msl)


  • The ERG Gallery has pictures of the ER Radios and Aerial.
  • Cavity Duplexer: Test results Before and After retune in 1995/6 to optimise rejection vs desense. Also - Wideband


  • ER-4 installed on 7-Jul-2021 uses a Yaesu DR-2XE. Operating mode is AMS (FM-FM, Digital-Digital)
  • Compared to our older units, Idents etc sound different and there is no 'R' ack - please wait for the short Tx squelch tail instead
  • GB3ER was migrated to CTCSS-only on 21-Jun-2015 as part of the ER-3 installation
  • ER-3 used a pair of ADI 446 radios
  • This succeeded the earlier ER-1 and spare ER-2 systems that used Tait 196 radios
  • GB3ER has no networking/linking at present.