[Elecraft] OT: Aircraft radio FM

[Sandy Blaize]

NO!  I wondered about that for YEARS, even when I was working in avionics! 
The REAL reason for using AM instead of FM is the "FM capture effect".  A 
slightly stronger signal on the channel will "takeover" the channel.  You 
can't hear weaker signals thru it like AM.  This was the real reason for 
sticking with AM for aviation.....SAFETY in emergencies or "distress" 
conditions.

Besides the usual 108-135 or so Mhz for AM aeronautical, the UHF (225-400 
Mhz) the military uses is also still AM.

I think Aeronautical AM will be around for many more years IF some dumb ass 
"non engineer" decides AM is "Obsolete" and screws things up.  Seeing the 
present "bright" political appointees nothing would surprise me!

73 TO ALL,

Sandy W5TVW

-----Original Message----- 
From: Ken G Kopp
Sent: Tuesday, July 16, 2013 3:54 PM
To: elecraft at mailman.qth.net ; KX3 at yahoogroups.com
Subject: [Elecraft] OT: Aircraft radio FM

I suppose the argument about no heterodyne with FM can be
made, BUT ...

AM aircraft radio has been around since the end of spark and
steadily growing world-wide since that time.  It was solidly in
place -long- before FM was a gleam in Armstrong's eye.  It
remains that the staggering cost of conversion to FM is the
real reason it continues today.

73!

K0PP
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