2111[dxatlas] Re: CW Skimmer Audio IF frequency changes on its own
- Sep 8, 2010I contacted Larry N8LP and he reported:
"One of many things on the LP-Bridge list. First I have to add the telnet interface, unfortunately ;-(
--- In firstname.lastname@example.org, "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: <email@example.com>
> Sent: Tuesday, September 07, 2010 4:42 PM
> Subject: [dxatlas] Re: CW Skimmer Audio IF frequency changes on its own
> --- In firstname.lastname@example.org, 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."
> 2. The K3 has filter offsets for 5-pole filters but no offset for 8-pole
> 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
> 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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