Posted by
Rick Kunath on
Dec 31, 2007; 1:52am
URL: http://elecraft.85.s1.nabble.com/Diversity-at-50-MHz-tp457793p457798.html
Alan Bloom wrote:
> As I recall, signals at VHF/UHF tend to become horizontally polarized
> after propagating long distances, no matter what the polarization of the
> transmit antenna. That's why horizontal polarization is traditionally
> used for SSB/CW (DX-oriented communications) and vertical for FM (mostly
> local communications).
Exceptionally interesting thread...
K1JT (of WSJT fame) has been doing some experimenting with dual
polarization reception using two identical setups, preamps, receivers,
etc, connected to horizontal and vertically polarized antennas. Each
receiver requires a separate baseband feed to Linrad to decode (4
channels) that is then fed to a second computer over a dedicated
Ethernet crossover cable which is running MAP65.
Results have been outstanding.
Here is a link describing MAP65:
http://physics.princeton.edu/pulsar/K1JT/MAP65_Quick_Start.txtMy question would be, are there two separate IF outputs on the K3 if you
have two receivers installed?
Better yet, can you get I and Q outputs for both receivers separately at
the rear panel to feed into a 4 channel soundcard, and then along to a
computer running Linrad and then on to a second computer running MAP65?
Rick Kunath, k9ao
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