[Elecraft] Diversity Reception

[Vic Rosenthal 4X6GP/K2VCO]

I use diversity (vertically and horizontally polarized antennas) on CW a 
lot, and there's more to it than just selecting the louder signal. I 
can't put my finger on the precise mechanism, but it seems that CW 
characters are less prone to being damaged by bursts of QRN in diversity 
mode.

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 4 Aug 2015 07:32, Jim Brown wrote:
> On Mon,8/3/2015 8:41 PM, Edward R Cole wrote:
>> However it is not always bad for the two diversity channels to be
>> combined for best signal.  The example is digital signals which the
>> human brain cannot process.  The example was given of using two
>> antennas of differing polarity for HF.
>
> Combining, yes -- into different inputs of the analysis system. Again,
> when signals combine IN THE SAME SIGNAL CHANNEL (emphasis added)
> differences in the time/phase response of the two signal paths can cause
> destructive interference which degrades decoding.
>
> OTOH, in a sophisticated decoding system, there's certainly nothing
> wrong with bring both signals in on separate inputs, then combining
> them, or choosing the best signal, or even processing the signals to
> enhance readability. But ONLY combining them on a single electrical
> channel is a bad idea.
>
> One of my neighbors (near Santa Cruz) has a VERY interesting UHF
> repeater system. It's multi-site(five sites going on six),voted (meaning
> that the RX with the best signal is transmitted), and simulcast (all
> sites transmit at the same time). To make this work, Bboth audio and RF
> are synchronized to the Hz using a GPS reference and some really
> innovative use of low cost audio and networking gear. If you're
> interested, look at wb6ece.org, especially the Technical Info page,
> where there's video and audio of a talk that KA6SQG did at Pacificon
> about his system (WB6ECE is his dad's call). The audio is not well
> recorded, so you'll need headphones for good copy.
>
> 73, Jim K9YC
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