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

[Joe Subich, W4TV]

Rick,

A 2.8 KHz filter is not appropriate for for AM as it will
limit the maximum audio frequency to 1400 Hz (carrier +/-
filter bandwidth).   If you want to operate diversity in
AM you will need one of the wider filters.

If you're not in AM, keep the bandwidth below 2.8 KHz and
there will be no frequency shift in the sub RX.

I don't see how the compensation for 5 pole filters will
work with the widely divergent bandwidth - particularly
since the 8 pole filters do not have a frequency offset.

73,

   ... Joe, W4TV


On 2015-07-12 1:41 PM, rick.ag6ay at gmail.com wrote:
> Joe
>
> It's not that I want to use diversity beyond the filters I had in the sub
> rx, I just accidentally discovered this effect
>
> I am looking over Wayne's early comment about how their might be an issue
> handling 8-pole vs 5-pole shifts.  Could not the technique used for that
> situation be applied when the K3 knows the filter widths are different?
>
> Note I fully grasp diversity is degraded when the filters differ; I am just
> wondering if the frequency shift effect can be compensated for even when
> diversity is degraded.
>
> Cheers
> Rick AG6AY
>
>
>
>
> --
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