On 19/11/2011 00:42, J G Miller wrote:
On Friday, November 18th, 2011, at 20:35:05h +0000, Bill Wright wrote:

J G Miller wrote:

Probably not at the time of year when propagation by inversion is most
likely.

That doesn't make any difference because an inverted signal still has
the same polarisation. I know this because sometimes I accidentally
install aerials upside down.

I should have stated more explicitly -- temperature inversion effects.

Whoosh?


Which leads on to the question of polarisation -- is it correct that
vertically polarized transmissions are less prone to be propagated by
temperature inversion effects and this part of the reason why some
mainland transmitters have changed from horizontal to vertical polarization
to minimize interference with English tranSmitters, eg Egem on channel 22V

http://www.ab9il.NET/space-weather/spacewx4.html

But isn't there another effect that gives HP an advantage?


--

Graham.

%Profound_observation%