I used one of those in my car. It was very effective.
Currently in the shack I use this $10 direct box. It also comes in a 2 channel version. Both of these may have a bit better frequency response and isolation, and also are available immediately. But of course they are bigger.
https://www.amazon.com/gp/product/B0027V760M
However with the USB audio interface to my Note 8 so far there hasn’t been a ground loop problem, so no need for an isolation transformer.
Tks,
73 Ed w2rf
From: morse-expert...@googlegroups.com <morse-expert...@googlegroups.com> On Behalf Of Alex VE3NEA
Sent: Friday, January 1, 2021 6:34 PM
To: Morse Expert for Android <morse-expert...@googlegroups.com>
Subject: Isolation transformer
I have just received the audio isolation transformer that I bought on eBay for $5 a couple of months ago:
This transformer, when inserted between the radio and the smartphone adapter described on the Morse Expert web page, completely eliminates the ground loops. Now I can connect both the audio and USB cables to the phone at the same time, without any signal quality degradation.
Happy New Year!
73 Alex VE3NEA
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