[Elecraft] [K3] Aliases in Softrock panadapter display

[GW0ETF]

Thanks for the replies so far. However none tell me anything new...

There seems two ways to sync K3 and software (NaP3 in this case):-
1/ Set Global Offset to zero and and the SDR LO frequency to what it
actually is, ~8192 Khz
2/ What you all seem to do is set SDR LO frequency to the K3 IF centre,
~8215 Khz and then fiddle about with the Global Offset to get the radio and
software to sync.

Yes, I can do either but in both cases the SDR LO=0Hz centre point will be
offset from the tuned signal by approx 23 Khz. This means that if the tuned
signal is centred, the extreme ~23 Khz of the side opposite the SDR Local
Oscillator will be in the alias region.

Try injecting a signal and tuning it across the display toward this region.
As it crosses this point it dies away to be replaced I assume by an alias
coming in from the opposite side (which is not visible). If the display was
chopped off here as in Rocky, or indicated by a change in background colour
that would be better.

As I said earlier I think this is no more than a niggle in an excellent
program but I feel my earlier post didn't get the message across...

73,

Stewart, GW0ETF


Arie Kleingeld PA3A-2 wrote
> 
> Stewart,
> 
> I also use the Softrock.
> 
> My settings with CW Skimmer:
> Radio: SoftRock IF
> Sampling rate: 96 kHz
> CW pitch: 550 Hz
> Audio IF: minus 23379Hz
> 
> My settings with Power SDR-IF (love this one because it nicely 
> integrates with the K3):
> Setup, General, Radio Model: SDR-1000
> Setup, Audio, Sampling Rate: 96000
> Setup IF, IF Frequencies, Global offset  minus 23379,  LO center 8215000
> 
> Hopes this will point you in the right direction.
> 
> 73
> Arie PA3A
> 
> 


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