[Elecraft] Diversity at 50 MHz

[Alan Bloom]

Since the two receivers in the K3 are identical and use the same
frequency reference, I presume that when they are tuned to exactly the
same frequency the IF outputs should be phase-coherent (with an unknown
but constant phase offset).  Anybody know if that's correct?

Al N1AL


On Sun, 2007-12-30 at 17:52, Rick Kunath wrote:
> 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.txt
> 
> My 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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