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Chris
Signal over noise is different to max sensitivity. ie
signal 10 dB noise 8 dB therefore S/N 2 dB but with a rhombic the same signal
would be 30dB and noise maybe 12 dB therefore S/N would be 18 dB - a big
improvement.
As you say you have a strange set of circumstances, it
looks like your Noise is stronger than signal, therefore you would not hear weak
signals with any sort of antenna.
mal/g3kev
----- Original Message -----
Sent: Wednesday, August 03, 2011 7:08
PM
Subject: LF: Antennas
Hi Mal and LF,
Well, all I can say is that here the signal to
noise ratio on RX is better on my PA0RDT than it is on my long wire (inverted
'L'). I have always thought this a bit strange, quite often weak signals that
cannot be seen on the wire are perfectly copied on the PA0RDT. This applies
from 136kHz to 3.8MHz. I cannot see what else it can be other than local
noise/QRM level. 80m is another prime example where the noise has gradually
got worse over the years here.
Vy 73,
Chris, G4AYT, Whitstable,
Kent.
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