Re: [HCDX] HF radio signal propagation topics...

["Dan Ferguson" <shortwave@xxxxxxxxxxxx>]

Tom,

IIRC (perhaps not a given anymore, if ever), signal power reciprocity is 
essentially built in to the underlying prediction engine (VOACAP) upon which 
the software you've used is based.

DanF




----- Original Message ----- 
From: "Tomas Hood (NW7US)" <nw7us.heliophile@xxxxxxxxx>
Sent: Monday, June 04, 2007 10:54 PM
Subject: HF radio signal propagation topics...


> Hello, fellow SWL'er and potential Amateur Radio Operator:
>
> I'm letting this list know about some additions to my website (
> http://hfradio.org/ ).   These new pages contain information that many
> radio operators will find useful (based on the feedback I have gotten
> from this material when the original was published in CQ Magazine and
> Popular Communications Magazine).
>
> One would think that ionospheric radio propagation would be
> reciprocal. That is, the signal strength in one direction should be
> the same as in the reverse, or reciprocal, direction. In HF ray-trace
> theory, the distance is the same and the ionospheric control
> points-the points where the wave is reflected (or more properly,
> refracted) back to the ground-should be the same.  This is an
> interesting topic for those using very low power, for example.  Can
> your signal be heard well at the distant station, and can it compete
> with other signals that might be originated with a higher energy
> level?
>
> I explored this (is HF propagation reciprocal?) in a recent CQ
> Magazine "Propagation" column.  I've posted the meat of the text at:
>
> http://hfradio.org/ace-hf/ace-hf-reciprocal.html
>

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