There can't be THAT many old planes in the air that have this automated landing system.
Buy new receivers or install some filters. 5 MHz away? Okay. 10 MHz? Maybe. 200? Bugger off. They're not making new spectrum, so everyone (even incumbents) needs to move with the times. Just like the 30 MHz T1 microwave links out there. Put something else in the air more efficient. ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "Chuck McCown via AF" <[email protected]> To: "AnimalFarm Microwave Users Group" <[email protected]> Cc: "Chuck McCown" <[email protected]> Sent: Sunday, December 12, 2021 1:06:03 PM Subject: Re: [AFMUG] C band 5G vs Radar Altimeters Lots of old planes in the world. Lots of old front end filters too. And the system chirps the band to get a more sure return so it needs the bandwidth. It was designed to be robust, not to be spectrum efficient. Probably came out of WW2. Sent from my iPhone On Dec 12, 2021, at 11:45 AM, Mike Hammett <[email protected]> wrote: <blockquote> If radio altimeters have 200 MHz (which seems excessive), it seems equally excessive to be complaining about noise from 200 MHz away. ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "Tim Hardy" <[email protected]> To: "AnimalFarm Microwave Users Group" <[email protected]> Sent: Sunday, December 12, 2021 9:50:44 AM Subject: Re: [AFMUG] C band 5G vs Radar Altimeters Deja Vu all over again. Very similar to the OBE / adjacent channel concerns voiced in the 6 GHz unlicensed proceeding. The FCC’s total lack of understanding of receiver filtering in even current devices is astounding and its fairly clear that money / politics beats physics everyday. <blockquote> On Dec 11, 2021, at 3:59 PM, Chuck McCown via AF < [email protected] > wrote: I understand the issue now: https://youtu.be/942KXXmMJdY -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com </blockquote> -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com </blockquote> -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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