[RTTY] RadioShack isolation transformer replacement

[Alex]

I've used Radioshack's ground loop isolators for many years with 
excellent results. I always meant to write up my results in an article, 
but never took the time to do it.

When I still had a shack, before I moved, I used one between the 
computer and the Behringer mixer, and one between the mixer and the rig. 
The big advantage of these devices is that they have a nearly flat 
frequency response across the audio spectrum. Many transformers used in 
various kits do not.

The 1:1 and that other step up audio transformer that Radioshack sells 
are virtually useless. They create quite a strong electro magnetic  
field even when fed with a small audio signal. When you put two of these 
transformers in close proximity (less than 1.25 inch), make sure that 
you orient them at 90 degrees from each other. But even then you will be 
able to recover audio on one transformer while audio is only fed to the 
other transformer. The 1:1 transformer they sell suffers from more than 
the step up model they sell.

Adapter cables are easy to obtain from the same store, or bake your 
own.

73,
--Alex KR1ST

On Tue, 3 Apr 2012 23:18:30 -0500, Don Hill AA5AU wrote:

> Instead I found what they are
> calling a "Ground Loop Isolator". I have a strong suspicion that it's
> basically the same thing built into an enclosure with leads
> coming out of it with RCA audio plugs. It's on their website as p/n
> 270-054, shown here: