LF: RE: 137.5kHz WSPR - reports appreciated

[Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>]

Roger,

 

increasing the loop from 70 sq m to 80 sq m should increase the radiation resistance by (8/7)^2 = 1.3 = +/- 1dB.

Having the loop wire laying on the ground certainly adds some losses, but probably the wire resistance loss is dominating.

 

73, Rik  ON7YD - OR7T

 

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Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Roger Lapthorn [rogerlapthorn@gmail.com]
Verzonden: zondag 19 september 2010 18:43
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: 137.5kHz WSPR - reports appreciated

This afternoon I dropped the lower part of my loop so it now lays on the ground. Tuning seems unaffected, but the loop area is about 10sq m greater. Overall it is hard to see small changes but G3XIZ does seem to be giving me a consistent -22dB which is maybe 1dB better.

My 137.5kHz WSPR beacon is on this evening and I'd dearly love to get a few new reports, maybe from a little further away. Clearly at any distance copy will be right on the edge.

73s
Roger G3XBM

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