[Elecraft] K3 unexpected TX after iMic + CocoaModem

[Tighe Kuykendall]

I should have added that when the shack MBP is connected to the K3 and I 
attempt rig control using RUMLog, it communicates with the K3 and 
receives info such as freq even though it's in TX.  So there's 
communication there, I just can't stop the TX.

Tighe


On 2/16/14, 8:01 AM, Tighe Kuykendall wrote:
> Strange issue and haven't found much by searching.
>
> I use a MacBook Pro with my K3 and KX3.  It had worked fine for rig
> control and with the K3/P3/KPA utilities.  I added an iMic audio
> interface (bought it for the iPad and was experimenting) and setup
> CocoaModem for use with the KX3 to do digital modes.  When I connected
> the MBP back to the K3, any type of USB activity for rig control or the
> K3/P3/KPA utilities causes the K3 to go into TX which can't be stopped
> except by unplugging the USB from the MBP.  If there's no USB control
> activity with an app, the K3 works normally.
>
> I simplified the radio down to just the K3 with no other accessories and
> it still happens.  KPA utility works as expected with the KPA, even with
> the K3 powered ok and it going into TX.  I checked for grounding issues
> and reseated all of the serial cables.  The USB ports work normally for
> everything except interfacing to the K3.  I tried a different MacBook
> with the K3 and it works fine, so it's something with the MBP side of
> the USB connection on my shack laptop.
>
> I then took a questionable troubleshooting action to test K3
> communications, which I had planned to do anyway, was to move to the new
> beta K3 firmware.  I forced the K3 into MCU Loader and upgraded the
> firmware with the shack MBP.  No issues in communicating with the K3
> during the upgrade.  Once the K3 was back operational, same issue as
> before with unexpected TX on rig control.
>
> Anyone experience an issue like this before?  Thought I'd ask before
> stripping CocoaModem and related pieces off the shack MBP.
>
> Tighe
> NK4I
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