Here is the one possible explanation in my old article
http://www.k3bu.us/propagation.htm
73 Yuri, K3BU, VE3BMV, VE1BY etc.
> On January 16, 2021 at 6:20 PM Roger Kennedy <roger@wessexproductions.co.uk>
> wrote:
>
>
>
> If you have an efficient transmitting antenna, and an accurately calibrated
> S Meter, I have found over the decades that most signal reports are pretty
> Reciprocal.
>
> When it comes to 160m DX-ing, I think my own situation is fairly unusual, in
> that my Receiving Antenna is also my Transmitting Antenna. (being a dipole,
> it's fairly low noise on Receive)
>
> And as a result, 90% of the time I have found that my signal reports on Top
> Band are pretty much the same both ways . . . and that's whether working
> stations around Britain, around Europe, across the pond to North or South
> America (including to the West Coast), even the Far East or VK/ZL.
>
> Last night when I worked Jeff VY2ZM he said my signal was peaking S9 +20dB .
> . . and he was the same strength with me.
>
> But what prompted me to start a new discussion was receiving an mail from a
> station in Arizona who said I was 579 with him last night . . . but I didn't
> come back to him. Well, my noise level was around S3 last night, and I did
> hear a couple of stations down in the noise calling me . . . which means
> that he was far weaker with me than I was with him.
>
> And thinking about it, this happens quite often on Top Band. Not only is
> Propagation often VERY selective (meaning someone 200 miles away may have
> much better propagation to a particular area than you) . . . but also that
> sometimes the Propagation is ONE-WAY . . . that you're receiving them far
> weaker than they're receiving you, or the other way round.
>
> I wonder if many DX-ers on here have noticed the same phenomenon . . .
> particularly those that often work the same stations many times (as I do).
>
> 73 Roger G3YRO
>
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