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LF: To the exclusion of all others

To: [email protected], JAMES MORITZ <[email protected]>
Subject: LF: To the exclusion of all others
From: g3zjo <[email protected]>
Date: Mon, 04 Feb 2013 17:34:03 +0000
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko/20120327 Thunderbird/11.0.1

Today I ran up my tiny PA which produces 20uW EIRP then inserted 10dB of attenuation at 50 Ohms.

I suspected that G0VQH would still decode my WSPR with some headroom. I also suspected that this would be a one guy one girl relationship. I have no idea what antenna G0VQH is running but reports are almost always better than those of even closer stations. Results were as expected.
2uW EIRP :-
2013-02-04 16:04 G3ZJO 0.475690 -25 0 IO92ng +0 0.001 G0VQH JO02fe 91 57 2013-02-04 15:44 G3ZJO 0.475690 -25 0 IO92ng +0 0.001 G0VQH JO02fe 91 57 2013-02-04 15:34 G3ZJO 0.475690 -26 0 IO92ng +0 0.001 G0VQH JO02fe 91 57 2013-02-04 14:34 G3ZJO 0.475691 -27 0 IO92ng +0 0.001 G0VQH JO02fe 91 57 2013-02-04 13:04 G3ZJO 0.475693 -27 0 IO92ng +0 0.001 G0VQH JO02fe 91 57 2013-02-04 12:44 G3ZJO 0.475694 -29 0 IO92ng +0 0.001 G0VQH JO02fe 91 57 2013-02-04 12:34 G3ZJO 0.475696 -26 0 IO92ng +0 0.001 G0VQH JO02fe 91 57

20uW EIRP
2013-02-04 11:44 G3ZJO 0.475610 -20 0 IO92ng +0 0.001 G0VQH JO02fe 91 57

I say almost always because M0BMU signal was excelling last night with my 5mW EIRP, conditions were extraordinary though.

2013-02-03 23:20 G3ZJO 0.475629 -10 0 IO92ng +7 0.005 G0VQH JO02fe 91 57 2013-02-03 23:20 G3ZJO 0.475630 -8 0 IO92ng +7 0.005 M0BMU IO91vr 76 47

My signal to G0VQH is often better.

2013-02-03 12:16 G3ZJO 0.475665 +1 0 IO92ng +7 0.005 G0VQH JO02fe 91 57

James I haven't seen one of your excellent valuations of ERP for a while, I would value your analysis here. I am sure that due to my Marconi inv. L being surrounded by my steel masts, other antennas, houses and trees and also passes over an earthed aluminium greenhouse, I have lots of absorption and I my 40m Doublet acts as a parasitic element. I may have to switch out the attenuator for you to see me. I shall continue at this level this evening to see if any other stations manage a decode.

73 Eddie


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