"Jonathan Goodish" wrote:
My avionics shop told me that modern radios are sufficiently
shielded, but obviously, some older radios are not. Garmin uses the
same active antenna system for panel-mount as they do for portable.

I've had two radios that would flat-line GPS reception in the airplane. One
was a Sporty's handheld NAV/COM, the other was a Cessna ARC 385 panel
NAV/COM. The Sporty's would squash my portable GPS reception just by being
on; the ARC 385 would kill panel and portable GPS when transmitting.

--
Dan
C-172RG at BFM