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
McPherson
Sent: Monday, February 22, 2010 5:32 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K2 - Isolation box construction for digital modes
I'm building an isolation box (between K2 and computer with external
soundcard) for digital operations, containing two 1:1 transformers and
voltage
Euan,
Your grounds should not be connected between the K2 and the computer -
that will un-isolate your isolation box. At the isolation box, use
stereo plugs and jacks at your interface box and connect the
transformers to the tip and ring. Similar if you are using an
opto-isolator on the PTT
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.
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
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