On Thursday, June 26, 2014 7:48:50 AM UTC-7, John Carlyle wrote:
Can anyone recommend a 12 vdc to 5 vdc USB power source I can use to charge an iPhone in flight that won't break squelch on my glider's radio?



-John, Q3

John - I have not had a problem with using a good quality cigarette lighter convertor. Blue Sea sells a panel mounted version, it seems to be shielded in a can (look on Amazon for Blue Sea USB). I had used a potted 12v-5V convertor with my iPhone 4S, you have to trick it by tying the USB data lines together with a 100K resistor. The same trick will not work with the Lightning connector on the iPhone 5S. You need a real cable and a USB supply that responds to the official protocols.