[Fourlanders] WSJT-X 2.2.2 GA Release

Mon Jun 29 11:15:19 EDT 2020

I don't entirely understand how turning down RF gain doesn't diminish the
ability to hear those weak signals. It seems like this would be
counterproductive, but I dunno.

-David

On Fri, Jun 26, 2020 at 10:39 AM Ted Wood <ted at k4k.pw> wrote:

> Ron is correct, the documentation does say to keep AGC off. I've found
> that, in practice, this recommendation has some wiggle room. To be
> clear, I'm not saying it's wrong, but there is at least one consequence
> of turning off AGC that operators should be aware of.
>
> I experimented for some time with both AGC off and on (fast, 0.1s) and
> found that for my particular use case, having AGC on did not impact
> performance in any negative way. Instead, it actually cleaned up many of
> the local strong signals and had no perceptible impact on my ability to
> receive weaker signals. I've provided an example of what a strong,
> nearby, signal (+22) looks like with, first, AGC off (bottom three
> signals) and then with it on (top two).
>
> 73
> Ted
> K4KPW
>
> On 6/25/2020 11:34 PM, Ron Rogers wrote:
> >  From the man himself.....
> >
> > "Perhaps it's worth mentioning that our advice for all WSJT-related
> > programs has always been to disable the receiver AGC (if possible) and
> > turn the RF gain control well down, thereby minimizing AGC action.
> >
> > If you do this and follow instructions in the User Guide about setting
> the
> > signal level coming into the sound card (or equivalent device), there's
> > plenty of dynamic-range "headroom" still available for nearly all
> > situations.
> >
> > The decoders know how to handle widely different signal levels, and they
> > appreciate having a reliably constant baseline noise level during an Rx
> > sequence."
> >
> > -- Joe, K1JT
> >
> > Ron
> > WW8RR
> >
> > -----Original Message-----
> > From: Fourlanders [mailto:fourlanders-bounces+ww8rr=
> charter.net at contesting.com] On Behalf Of Jim Worsham
> > Sent: Thursday, June 25, 2020 11:24 PM
> > To: Kim
> > Cc: Fourlanders
> > Subject: Re: [Fourlanders] WSJT-X 2.2.2 GA Release
> >
> > Got a question for the FT8 knowledgeable on here. During the VHF contest
> a couple of weeks ago someone mentioned that you should turn AGC off on
> your RX. Any truth to that and why?
> >
> > 73
> > Jim, W4KXY
> >
> > Sent from my iPad
> >
> >> On Jun 22, 2020, at 10:18 AM, Kim <whensley11 at comcast.net> wrote:
> >>
> >> F.Y.I.  New release.
> >>
> >> 73, Kim
> >>
> >>> WSJT-X 2.2.2 is a bug-fix release, mainly to incorporate the new RAC
> >>> section PE (Prince Edward Island) into the FT8/FT4/MSK144 Contest Mode
> >>> messages for ARRL Field Day.  Several minor fixes and additions are
> >>> described at the top of the Release Notes here:
> >>> http://physics.princeton.edu/pulsar/k1jt/Release_Notes.txt
> >>> Upgrading from earlier versions of WSJT-X should be seamless.  There is
> >>> no need to uninstall a previous version or move any files.
> >>> Links to installation packages for Windows, Linux, and Macintosh are
> >>> available here:
> >>> http://physics.princeton.edu/pulsar/k1jt/wsjtx.html
> >>> You can also download the packages from our SourceForge site:
> >>> https://sourceforge.net/projects/wsjt/files/
> >>> It may take a short time for the SourceForge site to be updated.
> >>> WSJT-X is licensed under the terms of Version 3 of the GNU General
> >>> Public License (GPL).  Development of this software is a cooperative
> >>> project to which many amateur radio operators have contributed.  If you
> >>> use our code, please have the courtesy to let us know about it.  If you
> >>> find bugs or make improvements to the code, please report them to us in
> >>> a timely fashion.  Follow instructions in the WSJT-X User Guide here:
> >>>
> http://www.physics.princeton.edu/pulsar/K1JT/wsjtx-doc/wsjtx-main-2.2.0.html#SUPPORT
> >>> We hope you will enjoy using WSJT-X Version 2.2.2.
> >>>      -- 73 from Joe, K1JT, Steve, K9AN, and Bill, G4WJS,
> >>>              for the entire WSJT Development Group
> >>> -=-=-=-=-=-=-=-=-=-=-=-
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> >>> -=-=-
> >>> WSJT-X      Weak Signal Communication  . ©2001-2020 by Joe Taylor,
> K1JT.    References : https://physics.princeton.edu/pulsar/K1JT/refs.html
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