On 7-Sep-2006, Kevin Clarke wrote:

When running the recv sensitivity test, the KX drops out much later than
the GNS.


Was the RX sensitivity test done on the bench or in the airplane? How "much
later" (in dB)? If it's more than a few dB then the GNS 430 is probably
defective. There should be a published specification for receive
sensitivity, which will be shown in the Garmin shop service manual if
nowhere else. If what you get, with a bench test, does not meet spec then
troubleshooting needs to move to internal circuitry. Probably best done by
a Garmin authorized repair facility if there is such a thing.

Good luck!

-Elliott Drucker