[Elecraft] External PAN with PMSDR question on filters

[Bill W4ZV]

PA3CW wrote:
> 
> Hi all,
> I recently completed a small SDR receiver called PM SDR.  I am using it
> with HDSDR software. Currently i have it connected to the IF out on my K3
> to use it as panorama view.  In the software HDSDR i have to set some
> offset values in the different modes to have the PMSDR and K3 in sync.
> That is going fine, however, when i switch my filters i.e. in CW from
> 400Hz to the standard 3,7 kHz the synchronisation is lost and i need
> completely different offset values.  Why is the offset changing if i
> change filters? Is there any way i can correct this in the settings of my
> K3?
> Thanks
> Dick PA3CW
> 

I'm sure you meant to say standard 2,7 kHz...not 3,7 kHz.  The reason for
the difference is that 5-pole filters (e.g. 2.7 kHz) have a large offset
compared to 8-pole filters (e.g. 400 Hz).  You can either install a 2.8 kHz
8-pole filter or compensate for the offset in your software.  Unfortunately
it is not possible to correct for this in the K3 itself.

73,  Bill


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