True, the ALC is not a measure of audio drive. But, I know at what indicated "level" it becomes active on my rig, and I don't want the ALC to become active at all. Mainly because the attenuation isn't equal across the TX signal bandwidth on the 897 so it would "clip" the edges of the signal first.....if memory serves.
I typically use the 90% laptop, -5db software, 50% USB settings that I described because that keeps the ALC inactive within the normal operating spectrum with my conditions. The only time I changed them was when stations were on the edge of or "outside" the 500/2500 waterfall and I wanted to bring up the output a bit without waking up the ALC. Thanks for bringing up the modulator overdrive issue, so we'll just "tune" for the middle of the waterfall and leave it at that... :) 73 GL Lance KD4FW On Thu, Jun 6, 2019 at 9:27 AM Bill Somerville <g4...@classdesign.com> wrote: > On 06/06/2019 14:11, L Barley wrote: > > If the station is way up or down on the waterfall, (under 500hz or > > over 2500hz) I can usually push the volume control on the laptop up to > > 100% without running into any ALC attenuation from the rig. > > > Lance, > > really, this sort of operating is one of the common causes of poor > signals with excessive audio harmonics. If you have working CAT control > then you should enable WSJT-X's split operating feature to avoid > operating near the edges of your rig's SSB Tx filter. Increasing the > audio drive to compensate for reduced output power is a perfect recipe > for audio harmonics as you will overdrive the SSB modulator in a futile > attempt to overcome the attenuation of the SSB Tx IF filter further down > the Tx chain. Just don't do it! Set the correct audio level with a > 1500Hz Tx offset and leave it alone or at least never exceed that level. > > This sort of misunderstanding is yet another reason why assuming the > rig's ALC meter is some sort of measure of audio drive is not correct > and likely to lead to poor quality signals. > > 73 > Bill > G4WJS. > > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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