I don't propose to know the full details but I would assume that being
an SDR the K3 digitises the audio at some point. If the sampling rate
and the audio frequency have the right relationship then you can expect
to see those fluctuating effects. I have seen this when making
distortion measurements on AM radios since the sampling rate and the mod
are not phase locked these odd aliasing type effects occur. Moving the
modulation frequency even just a few Hz is usually enough to achieve a
rock steady reading.
Martin, HS0ZED
On 16/09/2019 19:09, Bob McGraw K4TAX wrote:
With my K3S I do find there is a relationship or interaction with the
scan rate of the ALC display and the frequency of the tone supplied by
FT-8. Specifically 1500 Hz will appear to have fluctuating ALC
display while the actual level is not changing. By setting the tone,
TUNE is a good application to do this, to some value higher or lower
than 1500 Hz will eliminate the display fluctuations. WSJT defaults
to 1500 Hz for TUNE mode.
Also if the Line Gain set via the MIC level control is less than 25 or
so, the granularity of the adjustment becomes critical. It is
suggested to lower the PWR slider on the WSJT application and raise
the value for the Line Gain to some value between 30 and 40. This
also applies to the value of SPKR level from the computer. Again
typically 30 to 40 are good values giving smooth level resolution and
changes.
73
Bob, K4TAX
On 9/15/2019 10:28 PM, David Bunte wrote:
Jim -
I have no answer, but mine has always been extremely critical. I can
set it
for 4 bars... and it won't budge... but I can't set it for the 5th bar
blinking... it goes from 4 solid to 5 solid no matter how much I play
with
the various level controls. I don't do a lot of digital work, so I am
not
really too concerned. There may be something I am missing, but I just
leave
it at 4 bars and hope for the best.
Dave - K9FN
On Sun, Sep 15, 2019 at 11:25 PM Jim Miller <[email protected]>
wrote:
K3 original - ALC erratic
Noticeable on digital mode(s?) (FT8). The ALC - set at 4 solid and
5th
flashing - is far more critical than I remember. Seems like I could
easily
set it exactly where I wanted it and it would stay there. Now not so.
Just wondering what can affect the adjustment to where it will drop
to 2
bars sometimes and the small change of the "mic" gain will make it
higher
than wanted. Not sure it is a continuous condition. Just far more
critical
than usual.
Thanks, Jim KG0KP
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