[App_rpt-users] Igologic i3386g Mini-ITX Power supply

[Mark Hergesheimer]

Mark Hergesheimer wrote:
> Is there a packaged image for the Igologic i3386g Mini-ITX booting from
the
> CF card and using the URI that someone would be willing to share?
> 
> If so where would I find it? (I'm new to the list)
> 
>  
> 
> Steve had mentioned that the power supply for the IGoLogic i3386g Mini-ITX
> should have an isolated ground and I found that the once the power supply
> jack was unbolted from the case that the input ground was isolated from
the
> PC grounds. Would this be enough isolation to defeat the ground loop
> problem?
> 
> Mark
> 
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The image is located at http://limeylinux.org/downloads
Look for the file: cfimg-i3386g-1.0.7-test.tar.gz

Regarding grounding, is there a problem or not as of right now?

____________________________

Steve,

Thanks

The short answer is: No not yet.
But I'm not at that point of testing yet. One of the things that attracted
me to the IGoLogic pc was the ability to run directly from 13.8v. This helps
with my diversity power system for the station. Per your email to me:

"Running an Embedded PC off of the same 13.8V source can be problematic due
to ground loops. There needs to be galvanic isolation at the power supply or
at the interconnect between the URI and the radio to reduce CPU noise
currents being coupled into the audio lines from the shielding and signal
return paths. The more powerful mini-ITX boards draw current in pulses which
can cause the problem mentioned above.

Galvanically isolated means that there is no direct or indirect path to the
ground (negative) terminal of the DC power source being used by the PC
through the interconnect cable to the repeater for control and audio.
Running the PC off of a 110VAC source eliminates this problem as AC power
supplies are galvanically isolated for safety reasons."

I was trying to avoid a problem and so I discovered that the input to the
IGoLogic power supply is actually isolated once the barrel connector was
dismounted from the case and thus a possible cure for a problem that I
really don't even have yet.

Mark