2010 UTC The 10dB attenuator is out of circuit now.
On 04/02/2013 17:34, g3zjo wrote:
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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