> edechazal@comcast.net wrote:
> > I've become irritated with the crackling noise my transponder (King
76C)...
>

Ed,

Here are some additional thoughts.  There is a very good chance that the
'crackle' you hear is the transponder transmission.  E-glass is invisible to
RF (radio frequency) energy.  Therefore it seems logical that if a 900Mhz
signal is striking you every time the transponder transmits, that your other
aircraft systems are also getting struck with RFI (interference).

You should probably take steps to shield sensitive areas of the cockpit from
the high power burst, which would hopefully shield you and passengers also.
Check out RST Engineering for some very good information.  Their website is
www.rst-engr.com

Good Luck!

Curtis N753K