[time-nuts] [OT] GPS from a window seat

[Roy Phillips]

Amen to your last paragraph.
Roy

----- Original Message ----- 
From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Friday, October 02, 2009 9:34 AM
Subject: Re: [time-nuts] [OT] GPS from a window seat


> In message <FAD0F39D8FA7F440861941A74B1AE560364986 at sbsserver.AREMV.local>, 
> "Dav
> e Baxter" writes:
>
>>Tests were done a few years ago at London Gatwick, LGW (on the ground)
>>to see what impact (if any) the use of a cellphone had when used inside
>>a commercial pasenger aircraft.
>
> I think the only documented effect so far, that have shown an actual
> capacity for instrument misreadings or mal-function, is interference
> with DME signals by really old or defective GSM phones in the 900MHz
> band.
>
> Since the coupling is via the planes DME antenna, there is very
> little mitigation possible.
>
> Given that most passengers are not willing to let the airlines take
> a "it probably works" attitude to the flight hardware, I think it
> is reasonably fair that the airlines ask passengers to do their bit.
>
> Personally, I find flying objectionable enough as it is, and I
> certainly do not forsee passengers yelling into cell-phones improving
> the experience.
>
> Poul-Henning
>
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by 
> incompetence.
>
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