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Radio Frequency Interference From 12V-to-USB Adapters
10 December 2017 | by 
Many small electronic devices have switching regulators in them that can generate a bunch of Radio Frequency Interference (RFI). This is not my first encounter with RFI-spewing devices. See this article about a automotive 12V-to-USB adapter giving me trouble: This Interference Seems To Follow Me Everywhere
I recently bought a couple of adapters that are physically larger than the one I wrote about. I was thinking that a larger size might allow for a little more filtering and a design that does not radiate. I was half right: one of them works pretty well, the other is an RFI Bad Boy.
Take a look at this short video where I check them out.
This is an Amazon link to the adapter that works pretty well.
Enercell® 2-Port USB CLA Car Charger
73, Bob K0NR
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I have found these little guys to be a disaster to use if you want to do mobile ham radio. My experiences have all been on HF mobile and traveling. It is either top off the phones or have the mobile HF radio on. One but not both.