Your picture didn't come through. But I did another collection using Audacity
via WASAPI and don't see it now.The reason I looked was an apparent power jump
on my wattmeter at the start of the transmission.Now that I'm watching via
WASAPI I don't see the power jump anymore. Quit Audacity and the power jump
comes back.Getting very irregular behavior. That starting amplitude sometimes
come in at 0.5V, sometimes at 0.1, sometimes at 1.0 -- can't quite find a
repeatable pattern. I guess I'd like to record directly from WSJT-X to see if
there's a comparison to be had.
And a friend of mine with an IC7300 was seeing the same thing on his rig too.
Plus others have now chimed in and said they see the power jump too. Could it
be random? What determines the level of the preamble?
On Thursday, April 5, 2018, 9:08:53 PM CDT, Steven Franke
<s.j.fra...@icloud.com> wrote:
Hi Mike,
I don’t see any evidence of problems when I look at the WSJT-X Tx audio
directly. I’ve attached a screen shot showing my recording of the Tx audio. I
captured this audio by routing the WSJT-X TX audio through SoundFlower (an
audio loopback device) and into the Audacity sound editor on my OS X machine.
This plot shows about 700ms of audio.
Steve k9an
On Apr 5, 2018, at 10:43 PM, Black Michael via wsjt-devel
<wsjt-devel@lists.sourceforge.net> wrote:
I found that this is related to the Tx delay settings.
The lower the Tx delay setting (< 0.2) the more max amplitude at the beginning
of the audio.
At 0.2 there's just a small portion but this may help explain why many people
have RF problems when Tx starts.
<1522968118900blob.jpg>
de Mike W9MDB
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