gm4cxm and gm3woj personal 10 ghz beacons
DESCRIPTION
GM4CXM and GM3WOJ Personal 10 GHz Beacons. Alan Dimmick GM0USI and Brian W Flynn GM8BJF. Personal Microwave Beacons. Beacons are a good way of generating interest in microwaves – signals there most of the time! Also keep the bands occupied! - PowerPoint PPT PresentationTRANSCRIPT
GM4CXM and GM3WOJ Personal 10 GHz Beacons
Alan Dimmick GM0USI andBrian W Flynn GM8BJF
Personal Microwave Beacons
• Beacons are a good way of generating interest in microwaves – signals there most of the time!
• Also keep the bands occupied!• Bit of a nuisance at your home QTH if active
yourself!
GM4CXM/B
Spots on beaconspot.eu
GM3WOJ/B
Origins of the Beacon Project
• Dawned on me that some of the Cairngorm peaks are LoS from both Edinburgh and Lowlands and East Coast of Ross and Cromarty
• Planned a QSO using “Grampian scatter” from Chris Tran’s QTH
• Chris offered to Host a beacon if I provided it.
Locations and Scatter Plot
Path Profile
Block Diagram of Hardware
Hardware
Installed on Tower
View South to Ben Macdui
Receiver Monitor Dish in IO85JV
Spots on beaconspot.eu
Dish and Receiver
The Receiver (Not Pretty!)
Live Audio
• http://gm8bjf.no-ip.org:5700• http://192.168.0.7:8000
Doppler “Tail”
Beacon Specification
• Callsign GM3WOJ• Location IO77WS62• Mode(s) JT4G + FSK• Frequency 10368.400 MHz• Reference OCXO (Usually within 500Hz of nominal carrier
frequency)• Power 700 mW• Antenna 35 cm off-set parabola (Ex BSB dish)• Beamwidth 7 degrees• Beam heading ~165 degrees• JT4G timing GPS
Acknowledgements
• Chris Towns G8BKE – Donation of PA• Susan Kivlin – Soldering of LMX2541 to PCB• David Anderson GM6BIG – Donation of OCXO• Chris Tran GM3WOJ – The location.• Andy Talbot G4JNT - for doing the hard work
sorting out the JT4G coding.