Operational ;
Partially Operational ;
Not Operational.
Operational ;
Partially Operational ;
Not Operational.
GB3XGH, Freq 10368.810000 MHz, LOC IO83WO, GPS locked, ERP 13dBW
Operational
First Operation from Rochdale IO83VO as from April 2000, Locked to GPS since March 2001.
Refurbishment Oct 2011 to Jan 2012
DX propagation:-
NW GM8BJF 194 km,
NE M0DTS 113 km,
SE G3EAT 279km, G8DDK 223 km, G4LDR 280km
S G4BRK 224 km, G3VKV 190 km,
SW G3UKV 100 km G4ALY 376 km,
More info
GB3MAN, Freq 24048.850000 MHz, LOC IO83WO, OCXO based, ERP 5dBW
Status: Operational
Modifications to ODU are complete and LO freq of 23737MHz is now stable and locked to a 105Mhz source.
The remaining variation is due to the unlocked xtal 14MHz oscillator which sets the
108.5MHz offset frequency in the LO. The new IF of 311.850MHz has been reprogrammed into the DDS.
The expected variation in frequency is within 300Hz.
(2011 Jan)
The beacon was first operational as from 09:00 UTC Sunday 26 Aug 2007, and locked to GPS as from April 2009.
Refurbishment Oct 2011 to Jan 2012
GB3MAN Freq 5668.880 and 5760.870MHz LOC IO83WO
Design:
The beacon will be a new dual frequency beacon and the freq generation uses a 5.7 GHz mixer fed
from a LO (using a PLL osc and doubler) working at 5.714.875MHz. The IF
is 45.995 MHz generated by DDS. Both of the resulting sidebands are
utilized.
The new plan is to get the beacon up and running by Feb 2012
History:
2008 06 08, NoV received after only three months from application -
this amazing speed caught us out, in that the equipment had not then
been built.
2011 Jan 12 - New Plan is to install all equipment in the IDU in the rack with a low loss feeder to the roof mounted slotted WG antenna (manufactured by Alan Moss G4VVT)
PA (Supplied by Brian Coleman G4NNS) and PSU(10V and -5V supplies plus interlock and fan cooler) complete and installed in Rack tray and tested, The Gemma PLL (by Grant Hodgson) and the completed DDS unit yet to be fitted.
The ODU will consist only of a weatherproof casing for the Antenna and adaptor to the Andrew cable. Small amount of metalwork to do. Plus mast bracket.
GB3MAN Freq 47088??? MHz LOC IO83WO
Status: A P-Com 50GHz link unit has been obtained and its
multiplier and PA will be used in the ODU of this beacon. License
application to be made after the feasibility and usefulness of the
scheme have been established. (2007 09 03)
GB3MAN Freq 3400.??? MHz LOC IO83WO
The Beacon will be in the IDU rack mounted 1U tray, the only outdoor item will be the antenna and cable
Status: PA obtained, Antenna design progressing. License application
not yet made. Antenna is to be a slotted WG constructed using a novel
method of manufacture from sheet aluminium. PA PSU to be similar to the
5.7GHz unit and PCB for this in work. Baseband is a GPS locked DDS.
2011 01 12-Update all units except PA now working and functional. Only remaining items are the PSU for the PA and the Antenna
3400 MHz band info - link to UKuG
GPS disciplined Freq Std
Status:
The Beacon cluster is locked to a single freq std based on the Brookes
Shera controller and a Motorola UT receiver controlling a Hewlett
Packard OCXO.
It has been decided that a more secure method would be to use a dual GSP
freq standard, set with freq limits to minimise the possibility of any
wild shifts due to malfunction. Such a dual unit is currently under
construction based on twin trimble palisade units driving VA2ZAZ
controllers each controlling a separate OCXO. These will be run in
parallel working as main and standby with deliberately limited freq
control. An out of limits alarm on one will be able to switch to the
other unit.(2009 05 20)
The Manual for the GB3MCB 23cms Beacon - This Manual contains the system and circuit information necessary for the maintenance of the beacon
UK Microwave Group - link to site
Mail to:
© David Wrigley 2000-9
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