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.
N7DF
Larry
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