GB7CH received its license back in December 2012 and has been an
active member of the wider D-
switch on. The repeater is located at Stenigot on the Lincolnshire
Wolds approximately 10 miles West of Louth.
This repeater is a member of the larger family of repeaters that are
currently active at the repeater site. The other repeaters are GB3LC
70cms Analogue FM, MB7PA 4mtr simplex Parrot and GB3XD
6mtr Analogue FM. All of these repeaters are hosted and maintained
by Brian, G7AJP.
GB7CH Technical Information
TX Frequency: 439.475mhz
RX Frequency: 430.475mhz
Antenna System: 4 Folded Dipoles (shared with GB3LC)
RF Modules: 2 Simoco SRM 9000 (1for TX, 1 for RX)
Repeater Modem: DVRPTR Version 1 with 1.69 firmware.
Computer Controller: Raspberry Pi Model 2B upgraded 01/11/15
Repeater and IRCDDB Gateway Software by Jonathan Nailor
Internet Connection: High speed fibre optic
System Power: Battery banks charged by Solar Energy.
(GB7CH IS ECO ENERGY FRIENDLY)
The repeater has a time server enabled which announces local time
every 30 minutes on the hour and every half hour. The system can
pass users GPS location to the APRS systems on the internet.
Keyboard communication is enabled allowing the D-
to be utilised. GB7CH is connected to the IRCDDB network which
enables point to point call routing between 2 stations.
The above photograph shows the complete repeater system on test.
The Raspberry Pi is in the green box with the DVRPTR modem in
front between the 2 Simoco RF modules. The transmit module has a
large fan bolted to the heat sink which helps with heat dissipation
and is a must have, especially under busy conditions. The entire
system is powered under test conditions by the Tait PSU. Once the
repeater is back in service it runs under battery/solar energy.