[1000mp] Diversity reception using the FT-1000MP

[Tom Rauch]

> For the brain to do maximum processing for spatial filtering of dual
> audio, reducing unrelated audio energy (noise) is very helpful. Yes,
> you can use stereo speakers, let me re phrase that, yes you can use
> dual speakers - one on the output of each receiver - for diversity
> reception modes and to good effect ...

Actually you have to be very careful using speakers, because 
isolation will not be near-perfect and the sound will mix.

You can not mix the sound from two receivers on two antennas unless 
the receivers are phase locked, have exactly the same phase shift in 
filters, and have the proper phase of RF signals at the antenna.

Headphones get rid of those problems, although it is still much 
better to have matched filters and phase locked (or common 
oscillator) receivers.

I use heavily modified R4C's with carefully matched filters for 
diversity, with wide (1000-2500 foot) separation on 160 antennas. 
With antennas separated less than 2 WL diversity does almost no good 
at all, just as it does when one antenna has much poorer S/N than the 
better antenna.

You have to actually hear good diversity to appreciate how bad less 
than optimum diversity sounds.

73, Tom W8JI
W8JI@contesting.com