Posted by
vk2rq on
Nov 15, 2015; 12:07am
URL: http://elecraft.85.s1.nabble.com/K2-and-NaP3-IF-offset-values-tp7610348p7610362.html
Understood. If you use CW-R on 15m & 10m, then that will help you match up the BFO frequency on those bands, as again the BFO will be placed on the low side of the crystal filter pass band, although the pitch you hear as you tune up the band will go high to low instead of low to high. To really fix this this up properly though would require some enhancements to NaP3. Not sure if the author ever released the source code though.
73, Matt VK2RQ
On Sat, Nov 14, 2015 at 12:29 PM -0800, "K8AC" <
[hidden email]> wrote:
I suspect that the difference I saw in the offset for 20M was indeed due to a
different filter selection. If I center the signal on the NaP3 indicator
using my most-often-used 400 Hz filter, advancing through subsequent
narrower filters I see just a bit of movement of the signal relative to the
pointer. But, with the two wider filter positions, the movement is
substantial and would require a much larger or smaller offset in NaP3 to get
the signal aligned with the pointer.
With a bit of work, I can probably get the signal and pointer pretty much
aligned by tweaking the BFO settings for the wider filters. I'll watch the
shape and position with Spectrogram while doing that.
By the way, this isn't just an academic exercise. When I'm operating split
and chasing DX, I often need to be able to position the transmit VFO pointer
on a signal and have the K2 exactly on that frequency and not a couple
hundred Hz away.
--
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