Re: [wsjtgroup] Re: WSJT-X v1.2 r3556, beta release [2 Attachments]
- Joe --
> To keep the displayed audio level at no more than ~30 or even ~40 dBRunning the audio as high as you do necessarily limits the "headroom"
> requires adjusting the sound card digital gain to "20" and the input
> attenuator to 8 o'clock (normal would be "80" and 1:30) and doing so
> results in the need to set "Wide Graph" zero to +10 or more to see the
> weakest signals.
> If ~30 dB at mid range of the slider is accurate, it appears to me that
> WSJTX has 20 to 30 dB more (excess) internal gain that other software.
> However, that is not likely to be a factor in the difference in input
> handling since the excess gain appears consistent between 3520 and
> 3556 and does not appear to be an issue on the i7/Windows 8 system.
for strong signals -- when you're presumably trying to work a weak
signal nearby. AGC may save you from clipping in the A/D (which would
be bad); but AGC pumping will adversely affect your sensitivity to the
From long experience with EME, working signals at -20 to -28 dB when
strong locals (S9++) are in the passband, I always run with AGC off and
signal levels adjusted as I have described.
If you are getting good results, and maybe don't much care about the
weakest decodable signals, don't worry further.
On your other problem: my station computer is also a Core 2 with Windows
7 Pro, and it run r3556 flawlessly using the motherboard sound system.
The way WSJT-X and QtAudio negotiate with the driver for your USB CODEC
may be inefficient, the way we have set them up. We'll trace down the
problem, never fear.
-- Joe, K1JT
In Setup enable "Blank line between decoding periods".
73 David KC2WUF
--- In firstname.lastname@example.org, Ed <k7aat.ed@...> wrote:
> After just downloading and running the latest, 3563, I see the dashed
> lines are no longer present between successive minutes decodes. Was this
> Ed K7AAT