RE: [wsjtgroup] audio levels
I’ve cut and pasted a recent comment from Joe in which he was responding to a query I sent:-
“The fact is, the level really doesn't matter much unless you set it so
low that A/D quantizing steps add another source of noise, or so high
that signals sometimes hit the upper limit of the A/D range.
If you have reason to want the maximum possible dynamic range, use the
recommended level for WSJT-X. Otherwise, it's perfectly OK to set the
audio level higher and use the on-screen slider in WSJT-X to re-center
the "thermometer" scale.”
From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of chas cartmel
Sent: 15 May 2013 12:26
Subject: [wsjtgroup] audio levels
Sorry if this is a basic question.
I have looked at the various user guides for WSPR 2.11, WSPR-X, and WSJT-X and see that the recommended audio input level for the first 2 is 0db, whilst 30db is recommended for the latter.
My question is that although the recommendations suggest a value, what has experience shown? I get a reasonable amount of contacts but feel I could do better.
Also again a silly question perhaps, i have used JT9-1 via WSJT-X for QSO’s before my system gave me grief, but this mode is not on WSJT 2.11. What is the favoured mode now?
As posted previously WSJT-X will not allow me to transmit as it seems to overload the external soundcard regardless of audio method used. Always get 100% volume level unaffected by the volume slider on the Sound device control panel, however this does not modulate the rig. The soundcard and interface combination works OK with other software. I have therefore abandoned WSJT-X for the time being.
Thanks for your time all