Re: K2 - Isolation box construction for digital

[dw-4]

My instincts would agree with Bob on this question.
You might consider using stereo jacks with (Ring & Tip) only wired and
use the GND as sheilding.
Or you could omit the connector and wire direct out with a rubber
grommet in the box wholes.

N1BBR
---------------------------------------------------------------------------
If you do that, you can leave out the isolation transformers - and the
whole
box for that matter.

You're "un-isolating" them by connecting the grounds together.

Bob W5OV
--
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[Tim McDonough N9PUZ]

I would buy a) isolated jacks, b) mount regular jacks in plastic to
isolate them, or c) use an all plastic box to isolate them. That was
you don't have to remember to use a specially wired cable to preserve
the isolation.

Tim, N9PUZ

On Monday, February 22, 2010 11:04 AM [GMT+1=CET],
dw wrote:

> My instincts would agree with Bob on this question.
> You might consider using stereo jacks with (Ring & Tip) only
> wired and use the GND as sheilding.
> Or you could omit the connector and wire direct out with a
> rubber grommet in the box wholes.
>
> N1BBR
> ---------------------------------------------------------------------------
> If you do that, you can leave out the isolation transformers -
> and the whole
> box for that matter.
>
> You're "un-isolating" them by connecting the grounds together.
>
> Bob W5OV

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[John Lonigro]

My metal isolation box shares ground with the computer.  That way I can
use normal audio jacks and cables.  On the other side, I use a DB9
connector to isolate the box from any wires going to the radio.  My PTT
connection is isolated via an optoisolator (4N33), requiring another DB9
to the computer serial port for control.   If you isolate the audio
signals but not PTT, then you've again "un-isolated" everything.  If  
you use VOX for PTT, this isn't an issue.

73's, John AA0VE

Tim N9PUZ wrote:
> I would buy a) isolated jacks, b) mount regular jacks in plastic to
> isolate them, or c) use an all plastic box to isolate them. That was
> you don't have to remember to use a specially wired cable to preserve
> the isolation.
>
> Tim, N9PUZ
>
>  
>
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