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Re: Cellphones on air flight - was Comrex Remote Connections
To: CRTech <crtech@crtech.org>
Subject: Re: Cellphones on air flight - was Comrex Remote Connections
From: dave allen <crtech-mail@reyware.us>
Date: Fri, 10 Mar 2017 12:02:09 -0700
In-reply-to: <58c2ced4.c2806b0a.4d80e.487b@mx.google.com>
References: <CAHVmwnRGPwGqc-knU+KA9HJBDH79dXgS8L-fn=fsi4GZn6cwtQ@mail.gmail.com> <CAOkhgWo9XVZ5kVc9rrAGuESn_6RE_Bs5_6QQA=o_m+-5wMtazg@mail.gmail.com> <58c2ced4.c2806b0a.4d80e.487b@mx.google.com>
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just PLEASE take airplane mode seriously. it's NOT to save your battery. it's to save your LIFE. to not interfere with the plane's navigation systems. 'just talk'? tell that to the victims of a commuter flight that crashed while on ILS into grand junction CO a while back. traced it back to somebody talking on their cellphone.

dave allen

On 3/10/2017 9:04 AM, Alan Kilgore wrote:
The info below assumes that you are not on a plane that equipped with an operating micro-cell system.

Cell phones throttle transmitter power based upon the received tower signal strength to conserve battery power, to reduce interference to adjacent cells and to better equalize signals from multiple calls coming into the receiver simultaneously. Cell phones rarely operate at full power except when in extremely rural areas when located near the outer perimeter of widely-spaced cell towers.

If you are on a flight taking very much flight time, you will have a nearly dead phone battery if you don't either turn it off or put it in airplane mode. Otherwise, tower signals will be so weak that the phone will almost constantly use full transmitter power trying reaching a cell carrier that will register its presence for receiving incoming calls.

The closest towers under the plane will not usually be reached because of (1) the metallic plane body between phone and antennas below the plane and (2) the cell tower antenna'e vertical plane beamwidth focused to the horizon and below (beam-tilt). So, there will be signals from a bazillion cell towers which ring the horizon that are line-of-sight, each competing for your cell phone's receiver.

You will notice how very warm the cellphone is from all that activity.

If you go on a cave tour, the phone will do the same thing but won't be having the receiver interference issue, it will just keep trying to reach a tower using full power.
____________________________________
Alan Kilgore, CPBE
WRVM Chief Engineer

At 08:59 AM 3/10/2017, you wrote:
Just a thought on "Airplane Mode"... that usually shuts off all RF in/out of the phone. (Cell towers, Bluetooth, and WiFi)

A "Do Not Disturb" feature would be a better choice. :)

Willie...

On Wed, Mar 8, 2017 at 6:48 PM, Rich Roszel <<mailto:rich@creativegeniusproductions.com>rich@creativegeniusproductions.com> wrote:
Mark,

 (SNIP)

Also, with either app, it would be worth turning all notifications off and putting it in airplane mode in terms of being able to accept calls.



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Follow-Ups: Re: Cellphones on air flight - was Comrex Remote Connections
(Michael Barnes <barnmichael@gmail.com>, 10 Mar 2017 23:07:46 -0000)
References: Re: Comrex Remote Connections
(Rich Roszel <rich@creativegeniusproductions.com>, 8 Mar 2017 23:49:13 -0000)
Re: Re: Comrex Remote Connections
(Willie Barnett <wbradiolists@gmail.com>, 10 Mar 2017 14:59:35 -0000)
Cellphones on air flight - was Comrex Remote Connections
(Alan Kilgore <wrvm.engineer@gmail.com>, 10 Mar 2017 16:05:48 -0000)
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