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GM4CXM and GM3WOJ Personal 10 GHz Beacons

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!

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GM4CXM and GM3WOJ Personal 10 GHz Beacons

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  1. GM4CXM and GM3WOJ Personal 10 GHz Beacons Alan Dimmick GM0USI and Brian W Flynn GM8BJF

  2. 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!

  3. GM4CXM/B

  4. Spots on beaconspot.eu

  5. GM3WOJ/B

  6. 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.

  7. Locations and Scatter Plot

  8. Path Profile

  9. Block Diagram of Hardware

  10. Hardware

  11. Installed on Tower

  12. View South to Ben Macdui

  13. Receiver Monitor Dish in IO85JV

  14. Spotson beaconspot.eu

  15. Dish and Receiver

  16. The Receiver (Not Pretty!)

  17. Live Audio • http://gm8bjf.no-ip.org:5700 • http://192.168.0.7:8000

  18. Doppler “Tail”

  19. 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

  20. 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.

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