Loggings > HF Beacons
The Desert Whooper
Dave Richards:
--- Quote from: Teotwaki on October 12, 2021, 0526 UTC ---Tonight DW reported the internal temp at 63 and the 30th whoop seems whole again.
--- End quote ---
That observation shows quite remarkable attention to detail, Teotwaki.
Teotwaki:
--- Quote from: Dave Richards on October 13, 2021, 0609 UTC ---That observation shows quite remarkable attention to detail, Teotwaki.
--- End quote ---
Thanks Dave. It all sprang from a discussion between Syfr and myself at the end of March. He also pays close attention to interesting details. It’s been a long wait since March to get another data point!
Jim
Finman:
Copied the Desert Whooper early this morning, around 09:30 UTC, but again, couldn't copy the telemetry due to the noise level.
Desert Whooper:
--- Quote from: Heathkit on October 10, 2021, 0152 UTC ---
Wow! That's pretty good for a watt. I would LOVE to see the perfect antenna/matching/ground system he's got on it :D
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A lot of time was spent trying to determine how much transmit power was appropriate. After extensive research about QRP rigs one watt seemed appropriate. Next antenna efficiency and pattern were focused upon.
The desert soil is very rocky and dry so the antenna is hung relatively low to achieve a 50 ohm match close to 1:1 vswr. From the ideal free space length the antenna was shortened 92" to achieve the match. There are no additional ground rods or counterpoise elements strung out beneath the antenna.
Balun efficiency was also looked into and a simple 1:1 "transformer" of coax wound on a large core had the lowest loss.
Heathkit:
Thank you for that info!
73's
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