[time-nuts] GPS from a window seat

Robert Atkinson robert8rpi at yahoo.co.uk
Mon Oct 5 07:10:57 UTC 2009

Hi Tom,
There are new EMC standards and HIRF too. But that still leaves the legacy aircraft flying around. If you made the rules retrospective it would push the cost of flying up considerably. Most people don't want to know that the aircraft they are in is older than any car they would consider for everyday use!
Robert G8RPI.

--- On Sun, 4/10/09, Thomas A. Frank <ka2cdk at cox.net> wrote:

From: Thomas A. Frank <ka2cdk at cox.net>
Subject: Re: [time-nuts] GPS from a window seat
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Sunday, 4 October, 2009, 9:28 PM

>     I have read that there have been studies with a spectrum
> analyzer system on planes that have shown that compliance with the no
> radiating device rules and electronics off during takeoff and landing is
> far less than 100% though I certainly would not personally deliberately
> violate the law whether or not the probability of it causing a problem
> is significant.  Apparently one or two cellphones can be seen registering
> with cell systems during takeoff and landing on many flights - probably
> most of them unintentionally left on.

Which is why the onus should be on the aircraft manufacturers to make certain that there is no potential for life threatening danger from electronic devices.

A blanket ban is the usual response from a bureaucracy to something that they cannot actually control, and which they do not wish to put the effort into correcting.

But that doesn't change the fact that if a drunk businessman or a bored 6 year old with a new toy can stealthily endanger all the passengers on a plane, the responsibility - and liability - should be with the aircraft designer.

Bringing it back to the normal topic at hand, I wonder - if you had a radio receiver tuned to WWV, and a GPS with a 1pps, if you could see the relativistic effect of flying at 500 knots at 30K feet and log it on your computer?

Tom Frank, KA2CDK

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