[amsat-bb] Re: In-flight iPhone snaps Space Shuttle launch

[Glenn Little WB4UIV]

The rules are in effect to prevent possible interference to the 
aircraft navigation aids and communications equipment.
The potential for mix produces from numerous consumer grade 
electronic devices emitting part 15 compliant RF is just to 
unpredictable for the FAA to allow these possible RF sources to be 
energized during the landing and take off phase of flight.
If the interference were to occur at a higher flight level, the pilot 
has longer to respond and get the interfering emitter shut down.
During landing and take off the reaction time is just too long to 
allow the devices to be turned on.

It is not a matter of general EMI.
It is a matter of mix products from unknown emitters causing on 
channel interference to sensitive receivers.

73
Glenn
WB4UIV
ARRL Technical Specialist


At 01:28 PM 5/21/2011, Art McBride wrote:
>So what happens to this airplane when it flies near a FM or TV broadcast
>station? FAA rules call for EMI testing using 1 amp RF currents in wire
>bundles in the aircraft.
>
>This Cell Phone / computer/electronic interference from consumer electronics
>is a compilation of half truths, myths and deception. A shameful compilation
>of rules designed to intimidate from an origination that should be
>scientific in nature, and totally understand electromagnetic radiation.
>Maybe it is the "Federal" part in the FAA name that explains this behavior!
>
>Art,
>KC6UQH
>
>-----Original Message-----
>From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
>Behalf Of George Henry
>Sent: Friday, May 20, 2011 2:35 PM
>To: AMSAT
>Subject: [amsat-bb] Re: In-flight iPhone snaps Space Shuttle launch
>
>And what was her iPhone doing turned on during approach?  Still a no-no on
>all
>commercial carriers, AFAIK...
>
>
>George, KA3HSW
>
>
>
>----- Original Message ----
> > From: Clint Bradford <clintbradford at mac.com>
> > To: AMSAT BB <amsat-bb at amsat.org>
> > Sent: Fri, May 20, 2011 2:20:44 PM
> > Subject: [amsat-bb] In-flight iPhone snaps Space Shuttle launch
> >
> > The story behind the photo taken of the Space Shuttle from an in-flight
> >passenger jet. Stefanie Gordon shot the image of Endeavour's launch with
>her
> >iPhone as her plane descended for a landing.
> >
> >
> >
>http://www.tuaw.com/2011/05/17/in-flight-iphone-snaps-space-shuttle-launch/
> >
> >
> >
> >
> > Clint Bradford
> > clintbradford at mac.com
>
>
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