Joe Subich, W4TV-3 wrote:
>
>
> Bill,
>
>> I have 2.7k/1.8k/500/200 in my Main but
>> only 2.7k/500 in the Sub. When I want to use diversity, I
>> just remember to use a WIDTH which will auto-select either
>> the 2.7k or 500. This way I can still use the 1.8k/200 for
>> severe QRM situations in non-diversity and the 2.7k/500 for
>> diversity and/or other situations.
>
> With some thought would it not be possible to get 500 and 200 Hz
> filters with matched offsets so one could use bandwidth diversity
> in addition to antenna diversity? I will not be able to try that
> with my first K3 when that KRX3 arrives since the existing 500
> and 250 Hz filters have different offsets but I will look at the
> 200 Hz filter in the second rig to see if it is close enough to
> the -790 Hz (measured in radio #1, specified for radio 2) to be
> useful.
>
Sure you could probably do that if the offsets between the 500 and 200 are
not too far off. You'll probably want to set the 500 equal to the 200
rather than vice versa if they aren't identical (i.e. a shift in a 500 Hz BW
is not as critical as the same shift in a 200). I'm not at home now but I
recall my 500s are both -0.84 and my 200 is -0.91. If I wanted to try what
you described I would set both 500s to -0.91 since a shift of 70 Hz is still
not unreasonable in ~500 Hz total BW.
The magicians at Elecraft are now at work on an improved DUAL PB which will
allow more flexibility in the context WIDTH setting, which would accomplish
somewhat similar results (but the context BW is attenuated by -24 dB versus
the focus BW).
73, Bill
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