[Elecraft] K2 - Isolation box construction for digital modes

[David Woolley (E.L)]

You would be well advised to read "Computer to Radio Interfacing - You 
Don't Need An Expensive Interface!" 
<http://www.audiosystemsgroup.com/HamInterfacing.pdf>, by Jim Brown, a 
frequent contributor to this list and an expert on interference to audio 
systems.

Basically, throw away the transformers and provide very good functional 
earth bonding between all the components.

Euan McPherson wrote:
> I'm building an isolation box (between K2 and computer with external
> soundcard) for digital operations, containing two 1:1 transformers and
> voltage divider resistors. The box is metal. All input and output sockets
> are 3.5mm mono and are grounded to the box, hence all input and output
> braids are connected together via the box. Is this likely to create a ground
> loop problem? Advice would be appreciated before I solder it all together.


-- 
David Woolley
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