[RTTY] RadioShack isolation transformer replacement

[Dan Karg]

Interesting that the 3.5mm one linked here has 1.5dB gain
transformers, I'd like to see
the technology behind that :).

And the metal box one is rated for 30 W, that must have some serious
transformers in it !.

Don't you just like the marketing gimmicks for this stuff. That being
said they all look pretty good
for isolation use, aside from distortion issues and other things that
might come into play.


Dan K0TI


On Wed, Apr 4, 2012 at 12:19 AM, Dave Hachadorian <k6ll at arrl.net> 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.
>
>
> Dave Hachadorian, K6LL
> Yuma, Arizona
>
>
>
>
> -----Original Message-----
> From: Don Hill AA5AU
> Sent: Tuesday, April 03, 2012 9:18 PM
> To: 'RTTY'
> Subject: [RTTY] RadioShack isolation transformer replacement
>
> 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 online on their website and that part number is no longer valid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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-- 
Dan K0TI