Originally Posted by
IO540
[I]
would guess that the regular signal losses described here are due to poorly installed units. Most avionics shops do not do a decent job, and inter-equipment interference is very common.
I had a GNS430 in a G-reg plane I acquired. One I moved it over to N the avionics guy needed to do all of the tests that the FAA require for IFR certification - and they found that the number 2 com on several frequencies 'blanked' the GPS signal. I needed some new cabling and a repositioned antenna to fix it.