It was the only way they could get a signal in both the civilian and military
air bands. If you want to be able to use the military homing gear that is
restricted to military frequencies, you had to have part of your signal in the
military band.

It is a crystal BITCH making an antenna that is as good a radiator at the
fundamental as the second harmonic.

Jim



Chuck Forsberg WA7KGX
shared these priceless pearls of wisdom:

-Is the second harmonic of the 121.5 ELT signal used by satellites
-or a significant number of homing receivers?

Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com