Topband: Antipodal Focusing Of RF Signals

[CHARLES HUTTON]

I - and a lot of DX'ers who specialize in international MW DX - would 
disagree with this. There are many examples of incredible antipodal 
receptions, with recent examples being the 300 kw 1557 Taiwan station 
received with some regularity in Brazil.

One advantage that the MW DX'ers have is that they have a larger range of 
targets, they are on the air 24 hours a day 365 days a year, and use powers 
ranging up to 2 MW. That leads to some receptions that would surprise a lot 
of hams.


Chuck




>True antipodal focusing of transmitted RF signals does occur at HF 
>frequencies. BUT as Bob Brown NM7M pointed out in an earlier post the 
>ionosphere at medium frequencies is to heterogeneous to support antipodal 
>focusing.
>

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