[Elecraft] K2 - Isolation box construction for digital modes

[Lance Collister]

Hello Euan,

When I built my interface box here (years before K3's were available - HI), I did 
have ground loop problems.  I floated all the grounds in all the cables and did 
NOT connect them all together at the box.  The only place they were grounded was 
at the mic connector on the radio.  The way I did this was to use 1/8" stereo 
connectors in and out of the box, but to use the "right" and "left" terminals to 
transfer the lines into and out of the box, while leaving the ground unused.  GL 
and VY 73, Lance

On 2/22/2010 11:31 AM, 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.
>
> 73, Euan M0GBZ
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>


-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
LIVE MESSENGER CHAT: w7gj at hotmail.com
2m DXCC #11, 6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the Magic Band EME email!