The K2 changes the LO injection from high side to low side above 17m.
Early versions of NaP3 and PowerSDR/IF had an option box that allowed
the user to enter a frequency for K2 (and for K3) which reverses the
sidebands at a specified frequency, but later versions should do this
automatically at the correct frequency. I'm not sure which version
you're using, and I haven't used my K2 with LP-PAN since I got a K3, so
maybe there's a bug in some of the newer versions.
Larry N8LP
On 11/14/2015 11:31 PM, elecraft-requ...@mailman.qth.net wrote:
Date: Sat, 14 Nov 2015 09:15:43 -0700 (MST)
From: K8AC<fl...@k8ac.net>
To:elecraft@mailman.qth.net
Subject: [Elecraft] K2 and NaP3 IF offset values
Message-ID:<1447517743616-7610348.p...@n2.nabble.com>
Content-Type: text/plain; charset=us-ascii
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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