Locked Re: WSJT-X version wsjtx-1.6.0-rc1 Low SIgnal Decode Performance

Michael Black

Except waterfall width still affects the bandwidth being decoded, right?

Mike W9MDB

From: "Bill Somerville g4wjs@... [WSJTX]"
To: WSJTX@...
Sent: Tuesday, December 1, 2015 5:23 AM
Subject: Re: [WSJTX] WSJT-X version wsjtx-1.6.0-rc1 Low SIgnal Decode Performance

On 30/11/2015 22:19, N7RJN@... [WSJTX] wrote:
> I have been using WSJT-X 1.6.0-rc1 for nearly a week now. During this
> time I have noticed that the JT65 decode performance is not quite as
> good as I expected and not as good as version 1.5.
Hi Bob,

a common cause of poor decode performance is not having the default
sample rate for your sound devices set to 48kHz. Other than that, you
must set the levels correctly since too much gain will cause distortion
and too little will lose weaker signals. Either can cause the weakest
signals to not decode.

Avoid extreme settings for the Rx gain slider in WSJT-X, instead use
your rigs gain controls or your audio interface gain controls in
preference and keep the WSJT-X control near the middle setting.

Turn off "Flatten" on the waterfall when adjusting gain settings as it
disguises incorrect settings, note that waterfall and spectrum gain and
offset settings do not effect decoding, just the displays.


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