[Elecraft] OT: Aircraft radio FM

[Dale Putnam]

And... what would the improvement be for FM over AM? What  would it be
for ?? Other than making every aircraft change over... (follow the money) and the side
by side systems in each control point...  what would improve? Range?... not really...
quality of audio? not really.. what then? someone's ego.. ??
or best of all.. lining someone's pocket.??
 


Have a great day, 
 
 
--...   ...--
Dale - WC7S in Wy
 
 

 
> From: ebjr37 at charter.net
> To: kengkopp at gmail.com; elecraft at mailman.qth.net; KX3 at yahoogroups.com
> Date: Tue, 16 Jul 2013 16:27:26 -0500
> Subject: Re: [Elecraft] OT: Aircraft radio FM
> 
> 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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