You can search for Signalink mods on line for several approaches. Putting
metallic tape on the inside surfaces of the plastic end-caps helps a lot.
Adding a flat (small braid is good) jumper from the PC board to one of the case
screws also helps cut down RF in and out of the box.
Ferrite cores and shielded cables are very helpful. A short, shielded USB cable
can do wonders. Avoid external unpowered USB hubs, too.
Some versions of OS X have an issue with “losing” USB audio devices and act as
you describe. If the RF fixes don’t solve it, maybe an OS update is the way to
go. The RF mods won’t hurt, at any rate.
George J Molnar
Nevada, USA
KF2T @GJMolnar
> On Feb 5, 2017, at 12:31, Ben McKeown <[email protected]> wrote:
>
> Will do. Thanks for the advice, I'll let you know if it works.
> Any advice for keeping RF out of the USB bus? Ferrite choke on the USB cable?
>
> -Ben
>
> On Sun, Feb 5, 2017, 3:29 PM David Tiller <[email protected]
> <mailto:[email protected]>> wrote:
> Ben,
>
> I also use a MacBook Pro, and had similar symptoms. Mine turned out to be RF
> resetting the USB bus.
>
> Try running the sfw with the ptt disconnected from the radio and see if it
> still misbehaves.
>
> On Feb 5, 2017, at 12:30, Ben McKeown <[email protected]
> <mailto:[email protected]>> wrote:
>
>> I'm really enjoying working JT65 and JT9, but I'm having a bit of a problem
>> that is making very frustrating to have good QSOs. I'm running a SignaLink
>> USB connected to my MacBook Pro. Consistently after several transmissions
>> the WSJT-X software starts playing audio out of my internal speakers rather
>> than through the USB output.If I restart the software it usually picks back
>> up using the USB audio output but by that point I'm out of synch with the
>> other station.
>>
>> I've also noticed that when this happens the waterfall graph stops showing
>> new data.
>>
>> I'm running the latest version of WSJT-X (1.7.0).
>>
>> OS Version: OS X El Capitan (10.11.6)
>> Hardware: MacBook Pro (15-inch, Late 2011)
>>
>> I'd appreciate any help you can give.
>>
>> Cheers,
>> Ben
>> KB3WYS
>
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