If you're needing different levels at 500 or 2500 then you are probably hitting
the bandpass limits you have set on your rig.Levels SHOULD be constant across
your entire transmit bandpass.I can imagine 2500 might be a push for an older
rig but 500 shouldn't be.
de Mike W9MDB
On Wednesday, August 1, 2018, 5:19:36 PM CDT, Mark Spencer
<netsyn...@gmail.com> wrote:
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 spencerve7afznetsyn...@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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