GB3UHF - a
new beacon for 70cms
The new 70cms beacon GB3UHF at the same site as GB3VHF, is now in service
and is installed in an 18U rack that it shares with GB3VHF. The two GB3UHF yagi
antennas are installed between the existing two GB3VHF yagi antennas.
The hardware is similar in principle to that used for GB3VHF in that the
frequency accuracy and timings are GPS referenced and the keying format is the
same as that used for GB3VHF except that no phase reversals at the odd minute
+30 secs will be sent.
The antennas use similar types of 3 element yagis (Amphenol Jaybeam 7040420 for GB3UHF) and
point in the same directions ( 288 & 348 degrees) as those used at 144MHz
and with a similar E.R.P.
The new beacon operating on 432.430 MHz will provide a very useful tool
together with GB3VHF for determining propagation at both VHF and UHF over long
distances from the same site with time co-ordinated JT65B and CW identification
using FSK. It will be very interesting to observe the propagation conditions
with direct comparson of signals received from the two beacons, and the RSGB
PSC will be interested in anyone conducting long term measurements of both
It is very much appreciated by all beacon users, of the work and time that
BT Radio engineering staff and BT Wholesale staff have put into this project to
ensure that the beacon became a reality - thanks to you all.
Due to technical limitations in the existing
simple PLL driver unit, it is intended to replace the driver unit frequency
generator with a new system based on the OZ2M new generation beacon modules.
The intention is that the beacon will transmit the same infomation in the same
formats as at present. Many thanks to all who have already donated towards this
LATEST: The beacon is currently off the air to enable
the fitting of the OZ2M NGB units to the driver unit.