[RTTY] RadioShack isolation transformer replacement

[Dave Hachadorian]

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online on their website and that part number is no longer valid 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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