As some may have heard, a program is being developed which will allow unsighted Hams to make FT8 QSOs. Today the topic of decoding signals on the WSJT-X waterfall came up for discussion in the QLog Beta testers group.
I posted this info, which I'd like to share with the many who subscribe to the WSJT-X Development Group reflector. Unless you have read the WSJT-X manual, you might not be aware that only signals in the displayed frequency range of the Wide Graph or the waterfall as many call it, will be decoded. Most know that the lowest frequency decoded is set by changing the value in 'Start XXX Hz' box. However, many do NOT know that the highest frequency decoded is affected by the box titled "Bins/Pixel". If you have set the 'Start Frequency' to zero Hertz and set the 'Bins/Pixel' to 1, the highest frequency decoded will only be 1000 Hz. If you increase the 'Bins/Pixel' value to 2, signals will be only be decoded from 0 to 2000 Hz. Since many FT8 signals use tones above 2000 Hz, the minimum "Bins/Pixel" setting should be 3. However, the full 3000 Hz can only be decoded if the right wall of the Wide Graph window is fully widened to actually display out to 3000 Hz. Beware that even if the 'Bins/Pixel' is set to 3, if the far right wall of the Wide Graph window wall is dragged to the left so the Wide Graph displays only 0 to 1000 Hz is shown, only signals in that range will be decoded. The bottom line is that unless the full range of frequencies is displayed in the Wide Graph, you will not decode all stations transmitting in the full FT8 channel. And don't forget that using the high and low DSP roll off controls on your radio will also limit the audio frequencies that WSJT-X can decode. 73, Rich - K1HTV
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