Cambridgeshire Repeater Group

CRG Apply To Re-Instate GB3PE

Following agreement with the site owners – Dalmark Grain, the CRG is to apply to re-instate GB3PE from it’s site at Thorney Toll.  An application is being put together to send the the ETCC for approval, and it’s hoped to have that back quickly.

It is planned that the initial installation of the repeater will be using a Philips FX5000, controlled by a Zetron Repeaterman. The aerial installation is going to be tricky as there is only space for one aerial pole on the site, and that will determine what we can use. The original aim was for two aerial working, with the TX and RX aerials separated to give greater than 40dB of isolation, then the use of a barrel filter in the RX leg to increase that to over 80dB of isolation which is what’s required for 600KHz split operation.

The RX aerial will be at the top of the pole, with the TX below it by around 15ft. The RX aerial will have 6dBD gain, where the TX aerial will have 3dBD. ERP will be 25W (14dBW).  As this will be a new application for the repeater, it will be CTCSS access only, with 94.8Hz required in accordance with RSGB ETCC guidelines for Cambridgeshire.

A brief spec is as follows:

Repeater callsign – GB3PE
Input/Output freq – 145.175 / 145.675
CTCSS (decode/encode?) – 94.8Hz
1750Hz Access? – No
Lat/Long – TBA
Antennas height – TX – 30m, RX – 35m AGL (site at -1m ASL)
Antenna type – Omni – two aerial working
Timeout period – 3 minutes.

Any comments or suggestions, please send them to chairman@cambridgerepeaters.net