In message <[email protected]>,
Clifford Buttschardt <[email protected]> writes >Interesting observation
on real time listening on LF. When I was at sea >as a radio officer I
arranged two receivers one vertical and the other >horizontal using the
longwire 500 kHz antenna tuned to the same frequency >within one hertz.
Then by using two headphones, each arranged so that >opposite ears
listened to opposite polarizations, results were simply >amazing!
M.J.Powell wrote:
I did something vaguely similar with 6m SSB, but I switched by hand a
vertical and a horizontal antenna into the receiver. Fades were virtually
eliminated. Showing I think that there was a lot of polarisation rotation
on the incoming signals, but at LF?
This is a variation on the well-known technique of diversity
reception - which is what the old AR88D receiver was for (D for
diversity!) - used by commercial HF fixed stations for many years.
Mike, G3XDV (IO91VT)
http://www.dennison.demon.co.uk/activity.htm
|
