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-   -   Ground Loop Isolation - for cable TV ? (http://www.diyaudio.com/forums/everything-else/102469-ground-loop-isolation-cable-tv.html)

redrabbit 25th May 2007 06:45 AM

Ground Loop Isolation - for cable TV ?
 
Yes, I had audio hum resulting from the coax cable's ground, and resolved it with an Iso-Max VRD-1FF -- inline to the cable box.
Hum is 95% gone.....that's acceptable for me.

HOW DO I MAKE something similar ?
Is it just inline caps ?

Why can't I find any DIY ideas for this ?.....(besides the common back-to-back 75/300 ohm antenna transformers.)

=FB=

AndrewT 25th May 2007 04:16 PM

Hi,
the hum buster may be an audio transformer to provide isolation between the equipment.

Juergen Knoop 25th May 2007 06:29 PM

the so called antenna isolation transformers sold here rely on capacitor coupling.
No transformer inside the tranformers...:bigeyes:

redrabbit 25th May 2007 11:05 PM

I still don't understand why there isn't an easy diy solution ?
If they're caps, what values ?

Those Jensen isolators have a stated frequency that they filter/isolate, which I guess is crucial, so as not to degrade the video signal.
I believe they use caps too.

Many of us use ground isolation in our audio projects including me.
(10ohm resistor, and 100nf cap between earth and circuit)

=FB=

Juergen Knoop 26th May 2007 02:50 AM

of course you can DIY. The absence of a dedicated internet site doesn't mean one can't do it. ;)
Choose a 100pF or larger ceramic for the inner conductor and something in the nF range for the shield.
regards

alexmoose 26th May 2007 02:54 AM

Re: Ground Loop Isolation - for cable TV ?
 
Quote:

Originally posted by redrabbit


Why can't I find any DIY ideas for this ?.....(besides the common back-to-back 75/300 ohm antenna transformers.)

=FB=

Whats wrong with this solution, it is what I used in my dorm room, worked great!


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