On 07/02/2017 07:52, DI Siegfried Hanisch wrote:
#
Operating system
Mac OS X 10.11.6 but it also happened in earlier versions of Mac OS X
#
Concise description of the problem
after some transmissions, the Audio input and output seems to be
switched from the selected (configured) Audio Device to the OS Default
Audio Device
HI Siegfried,
sorry you are having issues with WSJT-X.
This problem has been reported by several Mac OS X users since around
version 10.10. We do not have a solution as it appears to be outside of
the scope of the WSJT-X application. At the time it started being
reported, those who reverted to 10.9 reported a 100% fix rate. That does
not help much but it does perhaps aid tracking down the source. The
WSJT-X audio source code has not changed over the period that this
problem has appeared.
The WSJT-X application code is using the Qt multimedia library and it
uses it in exactly the same way on Mac OS X as it does on Windows and
Linux where this problem does not occur. I have examined the Qt Mac OS X
implementation but cannot see any likely way a defect there could cause
this behaviour. Qt uses a fairly thin layer over the Mac OS X Core Audio
services.
What we do know is that it is hardware specific with some Macs not
suffering this issue, I do not have any correlation data that might
identify hardware that triggers this issue. It may also be software
related given that different hardware drivers will be in use for
different manufacturer's audio devices.
Some have reported success with reverting to an older revision of the
Silicon Labs VCP (virtual comms port) driver, this driver is common to
many rigs with built in combined audio and VCP endpoints built into
modern rigs with USB(B) connections. Unfortunately others have reported
that this does not help them.
Some have found that RFI is the issue and that is certainly feasible
since an unexpected USB reset condition where a secondary external USB
device is used for WSJT-X audio could easily cause these symptoms. It is
clearly not RFI in all cases and a simple test with very low transmitter
power and a dummy load will verify that.
73
Bill
G4WJS.
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