N7DF writes:
> The real factor in the anomalous change in signal strength between =
> qrp/qro signals is attributable to a threshold level of absorption in =
> the ionosphere. When the level of ionization drops below a certain =
> level, a signal must exceed the absorption potential before it will be =
> refracted and intercepted by ground based stations. This is easily =
> noticeable during band opening and closing periods where stations with =
> exceptionally tight beam signals break through with loud signals while =
> the majority of stations are not even heard.
Interesting. If that is the case - would you be able to hear some
non-linearity on a SSB signal? Also, if a strong station is near
the frequency of a QRP station, would they be affected? What if they
were on the same frequency? Sort of like biasing a diode - so that all
signals will pass.
73 N6TR SS
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