[hpsdr] The OpenHPSDR mRX PS DISPLAY 'Bubbles" Are Gone Now

[Scott Traurig]

Just to clarify: these bursts were REAL, and not an artifact of the
display, nor indicative of any problem with PowerSDR, Thetis, Muzy VAC, or
Voicemeeter.

It was a very poor design decision to use 4FSK with instantaneous frequency
transitions in WSJT-X for FT8 (or any other WSJT-X waveform). Although the
frequency transitions were phase continuous, that makes little difference
in the spectra because of the instantaneous change in phase slope. It's
nice to see the WSJT-X dev's finally recognize this and move to a GMSK
style transition.

There was a lot of lost time by many folks including myself looking for
problems that didn't exist, although I eventually figured it out:

https://apache-labs.com/community/viewtopic.php?f=13&t=2709&p=4841

https://apache-labs.com/community/viewtopic.php?f=16&t=2933

73,

Scott/w-u-2-o


On Sun, Jul 21, 2019 at 9:43 PM Dick Bingham <dick.bingham at gmail.com> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>  Greetings everyone
>
> Several days ago I installed the newest *WSJT-X 2.1.0 *software (includes
> the FT4 release!) that uses a revised waveform generator.
>
> To my delight the display on the HPSDR screen no longer has what I call
> "Bubbles"
> where the displayed TX-signal shows bursts of a broad base signal shaped
> like an old-style oil-dispenser (when running v3.4.7 SW.)
>
> 73  Dick/w7wkr
>
>
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