John,
I had the same issue on my Mac and it turned out to be RF getting into the USB
controller via the external rig controller/sound card. I fixed my issue by
putting a bunch of mix 31 ferrites on my feed line. I did the research at
fair-rite.com<http://fair-rite.com> and bought them from
Newark.com<http://newark.com>.
I didn't see this issue with my prior MacBook Pro, so I can only assume that
the newer ones are more RF sensitive.
Good luck!
On Apr 16, 2016, at 11:25, John Nelson
<[email protected]<mailto:[email protected]>> wrote:
I have (another) Mac user running OSX 10.11 with an audio problem reported as
follows:
-
I need some help with this problem that has crept up on my WSJT-X installation.
I'm using a Kenwood TS-590S with a Macbook Pro under system 10.11.5. The
issue I'm having is that in the middle of a QSO, the software switches from the
radio USB sound I/O to the internal microphone and speakers. I'm able to
re-create this problem by just launching the software and hitting the TUNE
button 2 or 3 times in a row. The only way to recover is either re-select the
USB Audio CODEC on both input and output or re-launch the program.
He adds: "There are documented issues with USB audio devices in general and OS
X 10.11 that
supposedly got resolved in 10.11.4. Also worth pointing out that this happen
on both JT-65 and WSPR modes."
-
An earlier report was with an Icom rig. Bill has mentioned that these
problems as probably OSX 10.11 related. I run OSX 10.11 and have not seen
this problem and cannot provoke it.
I have suggested using a ferrite core on the USB line in case of RFI but
without apparent success. In any case, RF power is very low - 5 watts or less.
Has anyone any suggestions? Are these reported elsewhere?
- John G4KLA
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