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 <n...@n0nb.us> To: elecraft@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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
