[Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade

[Don Wilhelm]

Rick,

I am going to go 'out on a limb' and make a wild guess that it did *not* 
behave that way with the old synth boards.  Wayne will likely correct me 
if I am wrong.

With the old synths in diversity mode, there was one synth driving the 
main RX and the other driving the subRX.
With filters being different (2.8kHz for one and 6kHz the other), each 
receiver could calculate the filter center and apply a correction to its 
synthesizer, and all would be 'well'.

With the new synthesizers, in diversity mode, only the synth for the 
main is used to drive both receivers.  This phase locks the two quite 
nicely, but if the two receivers are using different width filters, the 
calculation for the filter center cannot be correct for both filter widths.

73,
Don W3FPR

On 7/12/2015 3:11 PM, rick.ag6ay at gmail.com wrote:
> I get that diversity means identical paths but I do wonder if the freq shift
> might be compensated for even when different filters are used for no other
> reason than that's all that's available to the K3.  Yes that would mean
> diversity is degraded until one reduces BW down to where the filters are
> identical.  I suggest that might be better than hearing everything in your
> right ear shift suddenly.
>
> It's not a demand. It's only a thought as I thought it worked that way
> before I upgraded the Synths.
>
>