[Elecraft] Using K3 with CW Skimmer

[Larry Phipps]

The LP-PAN offset is nominal 6000 Hz, but it typically runs at about 
6100-6150 Hz. This value is entered in the NaP3 Global Offset box as a 
negative value, ie. -6000. The LP-PAN LO is 32836/4=8209 kHz. The K3 IF 
center is nominal 8215 kHz, a difference of 6000 Hz.

The Skimmer "Audio IF, Hz"  value can be calculated from the following 
formula on our CW Skimmer help page...

*K3 CW Sidetone Pitch + LP-PAN Global Offset = Audio IF, Hz
*
For example… 600 + (-6000) = -5400

You can walk it in from there. ALso, unlike NaP3, Skimmer does not 
adjust for filter offsets or DSP shift settings on the K3, so it is best 
to do this with the Shift/Width controls centered. The value will vary 
from filter to filter unless all your CW filters are 8-pole.

73,
Larry N8LP




On 2/5/2015 11:25 AM, elecraft-request at mailman.qth.net wrote:
> Date: Thu, 5 Feb 2015 07:46:42 +0000
> From: Ken Chandler<G0ORH at sky.com>
> To: iain macdonnell - N6ML<ar at dseven.org>
> Cc: Elecraft Reflector<elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] Using K3 with CW Skimmer
> Message-ID:<51CCB0F8-7714-4BC6-991D-B71D03272333 at sky.com>
> Content-Type: text/plain;	charset=us-ascii
>
> I'm seeing differently too.
> On HF running skimmer, softrock if mode,  LP pan2, LP Bridge. EMU 202 card at 192.
> Running thru NaP3, I can see the pileup etc, and it's accurate, no tweeking of the offset done.
> Bringing in CW skimmer I've had to retune offset to 5860, though I didn't do this on the recommended AM mode! Maybe I should have done!
> Anyway I'm set now to within a few Hz of being on the button.
> One thing which is a real pain is I cannot keep the emu open on the fast 2.0 card, have looked at trying to keep the port alive when the PC, win7 pro, is powered down but not been successful.
>
> Ken.. G0ORH
>
> Sent from my iPad
>
>
>> >On 4 Feb 2015, at 22:52, iain macdonnell - N6ML<ar at dseven.org>  wrote:
>> >
>> >LP-Pan (except for very early models) offsets the IF by 6kHz, to move
>> >any center-spikes introduced by audio interfaces out of the way. The
>> >same offset applies to all bands, except on 6m, you need to swap I/Q
>> >(there's an option in CW Skimmer for that) and make the offset
>> >positive instead of negative, due to the IF being reversed on the K3
>> >above 30MHz (or so). Not sure why you would be seeing different
>> >behaviour on the lower bands.....
>> >
>> >73,
>> >
>> >    ~iain / N6ML
>> >
>> >
>> >
>>> >>On Wed, Feb 4, 2015 at 2:37 PM, Pete Smith N4ZR<n4zr at contesting.com>  wrote:
>>> >>Update - I don't understand how or why, but if I set CW Skimmer's "Audio IF"
>>> >>to -6150 Hz, that brings the K3 and CW Skimmer frequency readouts into
>>> >>agreement.  There is an explanation of audio IF in the Skimmer help file,
>>> >>but I can't get my brain around it.
>>> >>
>>> >>73, Pete N4ZR
>>> >>Check out the Reverse Beacon Network at
>>> >>http://reversebeacon.net,
>>> >>blog at reversebeacon.blogspot.com.
>>> >>For spots, please go to your favorite
>>> >>ARC V6 or VE7CC DX cluster node.
>>> >>
>>>> >>>On 2/4/2015 4:37 PM, Pete Smith N4ZR wrote:
>>>> >>>
>>>> >>>I've been experimenting with using the K3 with CW Skimmer to work K1N. I'm
>>>> >>>feeding LP-Pan 2 from the K3's IF, and running CW Skimmer if Softrock IF
>>>> >>>mode.  I'm using Omnirig to read the K3s frequency and control it.  This
>>>> >>>works super well at least down through 15 meters - I can see the first 10
>>>> >>>KHz of the pileupabove K1N's transmit frequency, and see exactly where he
>>>> >>>last worked someone.
>>>> >>>
>>>> >>>
>>>> >>>However... I just tried the same technique on 30M, where K1N is currently
>>>> >>>at 10113.1.  I can't see him or his pileup at and above that frequency, but
>>>> >>>if I tune the radio down to 10107.9, ghe appears on the waterfall with the
>>>> >>>expected humongous pileup over the next few KHz above.  So now I'm
>>>> >>>wondering, is the relationship between IF frequency and dial frequency
>>>> >>>perhaps different on the lower bands? Has anyone tried this same thing and
>>>> >>>been able to make it work on 40 and below?
>>> >>
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