[Elecraft] OT: AM mode

[Mark Petiford]

Re: "...capture effect.  As AM does not have it, an air controller can tell when two aircraft transmit at once, much like on HF SSB for us."

Extremely important to controllers and pilots.  The resulting hetrodyne is very distinctive.


Mark
KE6BB



________________________________
 From: Nate Bargmann <n0nb at n0nb.us>
To: elecraft at mailman.qth.net 
Sent: Tuesday, July 16, 2013 12:56 PM
Subject: Re: [Elecraft] OT: AM mode
 

* On 2013 16 Jul 14:31 -0500, Ken G Kopp wrote:
> VHF/UHF aircraft radio has always been AM, and is likely / certain
> continue to be.  Why?  It's used world wide and discussions about
> changing it to FM have continued for years.  The conclusion seems
> to be that there is simply too much usage worldwide and little reason
> to make the change.  The cost to change to another mode would be
> horrendous!  Of course manufacturers would -love- to see the change.

From a coworker that worked in avionics years ago one reason can be
summed up in two words--capture effect.  As AM does not have it, an air
controller can tell when two aircraft transmit at once, much like on HF
SSB for us.  Beyond that and I would be into speculation.

73, de Nate >>

-- 

"The optimist proclaims that we live in the best of all
possible worlds.  The pessimist fears this is true."

Ham radio, Linux, bikes, and more: http://www.n0nb.us
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