Re: K2 and NaP3 IF offset values

Posted by Don Wilhelm-4 on Nov 14, 2015; 6:17pm
URL: http://elecraft.85.s1.nabble.com/K2-and-NaP3-IF-offset-values-tp7610348p7610351.html

Floyd,

Rather than centering the signal on a CW signal, center it on the
carrier of an AM signal.  A CW signal should display offset from the
center by the amount of your sidetone pitch.

The K2 uses high side VFO injection for bands below 15 meters.  For 15
meters and above, it uses low side VFO injection.  That is the reason
you are seeing the change on 15 meters and above.

73,
Don W3FPR

On 11/14/2015 11:15 AM, K8AC wrote:

> I've been using my K2 with LP-Pan and NaP3 for a few months on the lower
> bands and just recently got on 20 and 15 meter CW with it.  I found that the
> offsets you specify in NaP3 were considerably different on 15, 12 and 10
> meters while that for 20M was just a bit off from the lower bands.  17M
> offset was the same as the lower bands.  For example, the global offset
> required on 80, 40 and 30M is 1170 in my case.  For 20M, it's 1200.  For 15M
> it's (-285) and (-330) for 10M.
>
> When I say the "offset required", that means the value I need to specify in
> order for the NaP3 center frequency indicator line to be exactly in the
> middle of a received CW signal.
>
> Not quite sure why the offset difference - obviously the IF signal is not
> exactly the same for all bands, but why not?
>
>

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