Thanks John,
I've ordered the USBuddy and we'll seee how it works.
I also use a Anker PowerCore (see link below) to run my iPhone and actioncam with no perceived noise on my radio.  Went with the extra battery just to be sure I don't drain the avionics stuff with the iPhone as it seems to pull a lot when actively navigating.
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
I also have a On Wednesday, September 27, 2017 at 11:40:05 AM UTC-7, John Carlyle wrote:
 Tom,
 
 I've been flying with a USBbuddy for 3 years - it's powering my iPhone 6. It has not interfered with my Becker AR4201 at all. 
 
 Before buying the USBbuddy I had first tried battery packs (one with an on/off switch), and found that my radio broke squelch on all frequencies. 
 
 -John, Q3
 
 On Wednesday, September 27, 2017 at 1:53:12 PM UTC-4,  wrote:
  So I recently got a dashcam for my crew vehicle and am trying to find a power supply that doesn't break squelch and introduce a crapload of noise into all receptions...  The one that came with the camera and a couple others I tried also made my FM radio near useless for weak stations.
  
  I sent an email to Powerwerx about this adapter and the response was that it is a lot cleaner than most.  And since these guys are in the ham radio biz, I would expect they understand RF interference.  I'll order one and see if it works in my truck and report back.
  
  5Z