[Elecraft] FTDI to serial adapter for K3 with Windows 7 change. Why?

[Don Wilhelm]

I have been informed by those who know that the behavior (wiggling the 
serial port lines) is confined to Windows.  It does not happen with the 
Apple (MAC) OS.

So only letters and other appeals to only Microsoft are necessary.
In the meantime, realize that those signals are active during MS 
computer boot times, and take whatever actions are necessary.

73,
Don W3FPR

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This will always be that "problem" when the K3 PTT-KEY menu item is not 
set to OFF-OFF.
If you need to use those functions from the computer port, do as others 
have indicated, first turn on the computer, let it run its startup 
diagnostics, and then turn on the K3.
If you need to do otherwise (to re-boot the computer), then put the K3 
into TX TEST until the computer completes its boot and diagnostics,
It does not matter whether you are using a real serial port or a USB to 
serial adapter, the result will be the same - the computer "wiggles" 
those serial port lines during its boot diagnostics.

Other than appealing to Microsoft and Apple to change that behavior, I 
don't see another alternative available.

73,
Don W3FPR