[RTTY] RadioShack isolation transformer replacement

[Ed Muns]

Apparently the RS unit comes with 3.5mm stereo adapter:

	What's in the box:
	Ground loop isolator
	1/8 inch-jack adapter

Ed  W0YK

 

Dave K6LL wrote:
> Interesting.  These are stereo devices, so there must be two 
> transformers in there.
> 
> A Google search turns up a lot of inexpensive similar devices.
> 
> Here's one with male & female RCA's:
> http://tinyurl.com/6o5mqmy
> 
> Here's one with 3.5 mm:
> http://tinyurl.com/77qz583
> 
> Here's one in a spiffy metal box:
> http://tinyurl.com/85bbqzr
> 
> I have no idea how effective they are.
   

Don AA5AU wrote:
> Since I couldn't operate because of weather last night, I 
> took time to fabricate a RadioShack audio isolation 
> transformer that I had in the junk drawer (was p/n 273-1374) 
> into a small plastic project box with two RCA jacks so I 
> could use it on a 2nd radio for JT65 AFSK transmission.
> 
> Today I decided to check the local RadioShack store to see if 
> they still sold this transformer and I couldn't find it. I 
> looked online on their website and that part number is no 
> longer valid and I could not find the transformer. 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:
> 
> http://www.radioshack.com/product/index.jsp?productId=2062214
> 
> I wonder if anyone is using one of these to route audio 
> to/from their PC to their radio? Seems like a slick solution. 
> I need to update my RTTY webpages if indeed this "Ground Loop 
> Isolator" 
> will replace the old audio isolation transformer. I read 
> through all the reviews. All but two were positive at getting 
> rid of hum on audio but all were from those using it with 
> sound systems and none from hams. I see no reason why it 
> wouldn't work for us hams.
> 
> The only problem I see with it, is that you would have to use 
> an RCA female to 1/8" phono plug adapter in order to plug it 
> into your PC sound card or else cut off the RCA plugs install 
> your own 1/8" 
> phono plugs.
> 
> Some of us still use homebrew interfaces and audio cables!
> 
> Thanks!
> 
> 73, Don AA5AU
> http://www.aa5au.com
> http://www.rttycontesting.com
> 
> 
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