Dear Alex, David and Group,
Just a thought, but isn't an antenna current of 2.75A a bit low for 0.5W ERP?
In my opinion, Vlad's ERP estimation seems not so unreasonable:
ERP=0.5W, EMRP=ERP/1.83=0.27W, Rrad=EMRP/I^2=0.036 Ohm,
h_eff=lambda*SQR(Rrad/1579Ohm)=10.5m.
Of course, effective height is affected by capacitive shunts and near-field
shielding effects, but heff=10m could certainly be achieved having a 20m high
topload.
But still, in spite of trying I haven't seen a trace of Vlad's signal here
either. Where is he located? And could you perhaps measure his frequency more
accurately relative to DBF39's carrier (138830.03 Hz)? - Besides the heavy QRN,
here in Germany the lower part of the band is somewhat affected by DCF
transmitter intermodulation, so a frequency above 137 kHz might be clearer for
us.
73 de Markus, DF6NM
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