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2113Re: [dxatlas] Re: CW Skimmer Audio IF frequency changes on its own

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  • Jeff Blaine
    Sep 8, 2010
      Telnet is how LP speaks to Skimmer. No telnet, no correction.


      From: Steve Ellington
      Sent: Wednesday, September 08, 2010 9:20 PM
      To: dxatlas_group@yahoogroups.com
      Subject: Re: [dxatlas] Re: CW Skimmer Audio IF frequency changes on its own

      What does Telnet and Audio IF correction have in common? Sounds like 2 separate projects to me.


      ----- Original Message -----
      From: bill_w4zv
      To: dxatlas_group@yahoogroups.com
      Sent: Wednesday, September 08, 2010 7:30 AM
      Subject: [dxatlas] Re: CW Skimmer Audio IF frequency changes on its own

      I contacted Larry N8LP and he reported:

      "One of many things on the LP-Bridge list. First I have to add the telnet interface, unfortunately ;-(

      Larry N8LP"

      73, Bill

      --- In dxatlas_group@yahoogroups.com, "Alex, VE3NEA" <alshovk@...> wrote:
      > Larry, the author of LP-Bridge, emailed me a while ago, explained how he
      > corrected for the IF variability in PowerSDR, and requested that I add a Set
      > Audio IF command to the Telnet interface in CW Skimmer so that he can
      > implement the same correction for the Skimmer. I added this command in
      > v.1.6, hopefully Larry will eventually implement the IF correction for CW
      > Skimmer as well.
      > 73 Alex VE3NEA
      > ----- Original Message -----
      > From: "bill_w4zv" <w0zv@...>
      > To: <dxatlas_group@yahoogroups.com>
      > Sent: Tuesday, September 07, 2010 4:42 PM
      > Subject: [dxatlas] Re: CW Skimmer Audio IF frequency changes on its own
      > --- In dxatlas_group@yahoogroups.com, Wayne Adams <wa9vee@> wrote:
      > >
      > > Is it really solved in the W2UX version? I have been looking for a
      > > solution to
      > > the frequencies being wrong in Skimmer when the roofing filters change in
      > > the K3
      > > for a long time. Before Christmas Larry put it on his LPBridge todo list,
      > > but no
      > > action yet.
      > Some misinformation here...
      > 1. LP-Bridge does include filter offset info:
      > "SDR Linking... The following functions are currently linked between the K3
      > and the SDR software: VFO A, VFO B, Mode, IF Offset and TX/RX. The links are
      > bidirectional, meaning that any change made on the SDR software will be
      > reflected at the K3, and vice versa. In addition, LP-Bridge provides links
      > for VFO B, K3 bandwidth and Preamp/Attenuator settings to allow the vertical
      > scale in the SDR software to be re-adjusted whenever the K3 preamp or
      > attenuator are activated. These require setting up an additional CAT
      > interface port in the SDR software."
      > http://www.telepostinc.com/LPB.html
      > 2. The K3 has filter offsets for 5-pole filters but no offset for 8-pole
      > filters.
      > 3. Skimmer's Omni-Rig can only accept one offset.
      > 4. WU2X's latest version of PowerSDR does include offset corrections.
      > "If you have selected the Elecraft K3 as your rig type, you don't need to
      > put any values in for the IF Frequencies for each mode - leave them set to
      > zero." (referring to PowerSDR...not Skimmer)
      > To correct for the K3 offset issue with Skimmer, there are several potential
      > solutions:
      > 1. Use only 8-pole filters which have zero offsets and thus do not change
      > when switching filters.
      > 2. Keep track of which filter you are using and change the Skimmer >
      > Settings > Radio > Audio IF setting manually when you switch filters. This
      > isn't convenient but it's what I do. Since I use 500 Hz 8-poles in
      > diversity 99% of the time on CW, it's not a huge problem for me.
      > 3. If Alex had time, it should be possible to read the K3 IF offsets via
      > commands (as PowerSDR does) and correct the Audio IF settings automatically.
      > However he's very busy and probably has higher priorities to worry about
      > than this one.
      > BTW I no longer use PowerSDR/HRD at all. I use only Skimmer directly with
      > the K3, N1MM and LP-Bridge. For contesting and DX-ing on CW, I don't miss
      > the PowerSDR/HRD combination at all, which takes quite a load off of my
      > computer as well.
      > 73, Bill

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