Message-ID: <20220119013615.30412869@telecom2018.csail.mit.edu>
Date: Wed, 19 Jan 2022 01:36:15 +0000 (UTC)
From: Bill Horne <malQRMassimilation@gmail.com>
Subject: 5G Deployment And Radio Altimeters - A Clash Of Industries
And Regulators (Podcast)
by Levine, Blaszak, Block & Boothby, LLP
There is a fascinating dispute unfolding between the wireless
communications industry and the aviation industry, or rather, a
dispute between their respective regulators, the Federal
Communications Commission (FCC) and the Federal Aviation
Administration (FAA). The dispute revolves around the wireless
carriers' use of C-Band spectrum to deliver 5G and the aviation
industry's use of nearby spectrum to control aircraft.
Listen to this 12-minute podcast as Steve Rosen, a Partner at LB3,
David Lee, TC2's Technology Director, and Joe Schmidt explain this
technical and legal conundrum and why it will be a regulatory and
economic train wreck if the dispute doesn't get sorted.
https://www.mondaq.com/unitedstates/telecoms-mobile-cable-communications/1151072/5g-deployment-and-radio-altimetersa-clash-of-industries-and-regulators-podcast?email_access=on
--
Bill Horne
(Please remove QRM from my email address to write to me directly)
Message-ID: <ss846n$hh3$1@dont-email.me>
Date: 18 Jan 2022 22:31:17 -0600
From: "Dave Garland" <dave.garland@wizinfo.com>
Subject: Re: T-Mobile begins blocking iPhone users from enabling
iCloud Private Relay in the US
On 1/18/2022 8:23 AM, Bill Horne wrote:
> The question we need to talk about is *WHY* U.S. citizens don't have
> anything but a small fraction of the privacy protectdions European
> cellular users enjoy. *THAT* is worth talking about.
That's certainly true. But (some of us) who use VPNs also use the DNS
service the VPH provides. Sure, we should get more, I'm working with
what we have now.
Message-ID: <10585a5e-4275-0289-f3ba-04747561a2d4@gmail.com>
Date: Wed, 19 Jan 2022 13:09:53 -0500
From: Bill Horne <malQRMassimilation@gmail.com>
Subject: Why are airlines predicting doom and gloom about 5G?
Tom,
Please listen to the podcast available
here and pass this along to
any of the heavyweight techs in your ham club.
Long story short: the aviation industry is hyping the possibility of
dead bodies all over the place if the cellular carriers (which have paid
big bucks to put 5G equipment in "C Band") don't stop and change their
plans and go someplace else.
Here's the point that I'm confused about: according to the podcast, the
cellular authorizations go up to 3.98 GHz, and the aircraft altimeters
that we're hearing all these dire warnings about are assigned to a range
which starts at 4.2 GHz. I'm old-school, admittedly, but having 220 MHz
of "guard" space between those two services seems adequate to me.
Ergo, why the fuss?
* Are the avionics salesmen trying to create a firestorm of fear that
motivates airlines to buy brand new radar altimeters?
* Do the old altimeters have substandard design?
* Is the cellular industry choosing to ignore known risks?
* Is it all a ploy by the cellular carriers to grab more spectrum for
cheaper prices?
I'm just waiting for the other shoe to drop, because there's something
unsaid in this debate.
Replies intended for publication should be sent to
telecomdigestsubmissions@remove-this.telecom-digest.org
--
Bill Horne
Moderator, The Telecom Digest
(Please remove QRM from my email address to write to me directly)
*****
Interim moderator's response:
The problem is that the FAA standards for altimeters required them to
exclude signals from "more than 10%" away. That's 420 MHz of allowable
sloop in the receiver. They made that standard in 1983 and never updated
it. Many altimeters are better than that, but some apparently aren't, or
aren't much better, so they can pick up signals from 3.8-3.98 GHz.
So both sides are at least partly to blame. The FAA allowed crap
altimeters to stay around too long, simply because there was no immediate
need to do better. And the FCC discounted their concerns, because the
actual risk is pretty small. Also, the FCC allowed the mobile base
stations to operate at higher power levels than European ones can, and if
they actually do run full power -- by no means certain, but the FAA has to
take that into account -- then they might mess up the crap altimeters.
Had they talked earlier, this could have been fixed quietly. Now it's two
industries and their somewhat captive regulators flexing their muscles
against each other.
- Fred
