GB3FR is located in
the Lincolnshire Wolds, about four miles West of Spilsby, and
operates on channel R7; input frequency 145.175 and output
frequency 145.775.
It can be accessed using ctcss (continuous tone controlled squelch
system). The ctcss frequency is in group B, (71.9Hz).
The equipment
in use consists of a Tait T355 receiver, and a T356 transmitter,
with a logic control system designed and built by Derek G4SJV.
A Pye F494 is availiable as a standby. Due to the rural
location of the site, and the slightly unreliable electricity
supply, a battery backup system is installed, conisting of two 42
AH dryfit batteries and a charger built by G4DDI. This system can
run the repeater for approximately eight hours, battery operation
is indicated by a "pip" every few seconds during
operation. Users are asked to keep use to a minimum when
battery operation is indicated. |
The Tait base station and Marconi
cavity filters
|
The aerial system
consists of a J-Beam C5 colinear for receive, and a pair of
dipoles for transmit. Isolation is provided by five Marconi cavity
filters.
The equipment is
located in a secure insulated temperature and humidity controlled
hut within a farm building,
These pictures show
the view from the GB3FR location, the aerial system and an inside
view of the hut; visible are the Tait base station, the battery
charger and the cavity filters.
|
A view of the aerial system |