Posted for Tubamanflies@aol.com:

 In a message dated 6/21/2005 8:03:03 AM Central Standard Time,
 PJHWFD@aol.com writes:
 I have put EL system in both a Tiger, strips under the glare shield and in a
 Skyhawk, ring lights built into a new instrument panel overlay.  Both use
 the same controller and do not produce any noise on the radios/intercom.  A
 quick check on the noise source it to trying using the back up battery on the
EL
 and see if the noise is still on the avionics when you bring them up just on
 the ship power, battery only, engine down.  Try moving some  wires around to
 see if anything changes.
 
 The Lancair has incadecent ring lights with an Ameri-King controller.  These
 replaced the Fiber lights with did not work very well.  Again no  hum.  One
 comment on using fiberlights.  They do midigate the hum  problem somewhat but
 if you are going to light radios swithches ect you will  stil need another
 system.
 
 Good Luck
 
 Ray Gardner
 N107SD 360 @CWF