TopBand: RE: Poor 160 Conditions

[w8ji.tom]

Hi Bob,

Thanks for the reply. I can see I must read something into the text I have
that isn't really what goes on.
Hopefully you can help with one more question. This stuff is hard to
follow.

> and D-region physics.  MUFs are F-region matters and at the present time,

> no matter what the path, critical frequencies at the peak of the F-region
> are so high that 160 meter RF will always be propagated within the lower
> ionosphere. 

That much I understood OK, and certainly the part about noise and
transmitter ERP setting the LUF of a circuit.

My confusion ( and it seems like a few others who posted comments) is in
the area of absorption. I always, perhaps incorrectly, assumed absorption
on lower frequencies increases as MUF increases. If I understand what you
are saying, that isn't necessarily true. So we might have a case where ten
meters is open over the same path as 160 meters, absorption on 160 is (is
that the cut-off frequency for this behavior?) independent of the things
that control MUF?

Thanks Bob.
Tom


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