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 <[email protected]> > 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 > > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
