Just to add to this:
In my experience it is also helpful to carry out this type of test procedure at
various audio frequencies within the audio pass band of the equipment in
question. This is probably another good reason to run "CAT" control along with
"Split" so that the audio frequencies that are fed to the transmitter are kept
within a narrower range.
I have at least two older radios that require significantly different audio
drive levels at different audio frequencies. While I don't routinely use
these radios with WSJT any more there may be other hams who have equipment with
a similar issue who may not realize that settings at an Audio frequency of say
1500 Hz which give a good result may or may not be appropriate at say 500 or
2500 Hz ? I will add that looking at the appropriate meters / displays on the
radios in question does indicate to me that there is an issue that needs to be
addressed and in my view it is quite simple to adjust the power slider to
correct this. Still it wouldn't surprise me if at least some of the sub
optimal signals on the air were due to this type of issue.
I've never gotten a bad audio report while using the radios in question for SSB
voice and when I used to run them on RTTY I used FSK so I never noticed this
issue until I started using these radios with WSJT.
As usual the opinions and experiences of others may differ from mine.
73
Mark Spencer
VE7AFZ
netsyn...@gmail.com
> On Aug 1, 2018, at 11:41 AM, Black Michael via wsjt-devel
> <wsjt-devel@lists.sourceforge.net> wrote:
>
> Good instructions for the analog world.
>
> There's one more way that works on most any computer these days....
> Even people with direct USB connections to their rigs are having problems.
>
> I would add this...and it should work on most any rig setup....
>
> #1 Set WSJT-X to minimum power
> #2 Set audio devices (record/playback) to 0dB
> #3 Rig to 50% of rated power for CW (some rigs can do full power on CW, some
> can't)
> #4 Rig gain to zero (MIC gain if you're input is the MIC, or USB gain if USB,
> or Data gain if one of the DIN connectors)
> #5 Click Tune on WSJT-X
> #6 Bring up WSJT-X power SLOWLY to max...you should still see no power or
> very low output on your rig (assuming rig gain is at zero).
> #6 Bring rig gain up SLOWLY until you get 5W or so of power. If you don't
> see power coming up then you have the wrong gain control. Then look at your
> ALC meter. Whatever your ALC meter shows at this stage is where it should
> stay as you bring up the rig gain. Some rigs show 1 bar of ALC (e.g.
> IC-7100), some show 30-50% (eg IC-7300/7410), some show no ALC at all.
> #7 Bring rig gain up and eventually you will see the ALC start rising....back
> it down to the level you had at 5W. What ever transmit power % you have at
> that point is all you will be able to transmit without ALC kicking in. It
> will probably be 80-90% of your rated CW power.
> #8 Bring up rig power to full CW power level and the ALC should stay
> constant. You can now adjust your transmit power either from WSJT-X or the
> rig.
>
> de Mike W9MDB
>
>
>
> On Wednesday, August 1, 2018, 12:51:38 PM CDT, Jim Brown
> <k...@audiosystemsgroup.com> wrote:
>
>
> On 8/1/2018 9:50 AM, Black Michael via wsjt-devel wrote:
> > IMHO better if ops learn how to set up their rigs properly though.
>
> Exactly right. The last page of this link has detailed instructions for
> setting audio levels that avoids distortion.
>
> http://k9yc.com/USB_Interfaces.pdf
>
> 73, Jim K9YC
>
>
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