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  #11  
Old 6th December 2011, 12:07 PM
Nathan M Nathan M is offline
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The second one Rod.
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  #12  
Old 6th December 2011, 05:08 PM
Danny G Danny G is offline
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Several phones left on would be a big safety issue as there would be , say 8 signals going off , for only 4 phones , 200 if all passengers left phones on !Try at home putting as many phones at hand near a radio & listen for the result.Most of the airband signals from /to the plane are related [harmonics] to cell phone frequencies. Probably near 200 watts ,total power if all passengers used their phones within 10 meters of the avionics.Must have some issues.
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  #13  
Old 6th December 2011, 06:57 PM
David Ramsay David Ramsay is offline
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Quote:
Most of the airband signals from /to the plane are related [harmonics] to cell phone frequencies.
And where did we glean that gem of incorrect information from?
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  #14  
Old 6th December 2011, 08:31 PM
Danny G Danny G is offline
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"The laboratory results indicated that the phones not only produce emissions at the operating frequency, but also produce other emissions that fall within airplane communication/navigation frequency bands (automatic direction finder, high frequency, very high frequency [VHF] omni range/locator, and VHF communications and instrument landing system [ILS]). Emissions at the operating frequency were as high as 60 dB over the airplane equipment emission limits, but the other emissions were generally within airplane equipment emission limits. One concern about these other emissions from cell phones is that they may interfere with the operation of an airplane communication or navigation system if the levels are high enough.....see..."http://www.boeing.com/commercial/aeromagazine/aero_10/interfere_textonly.html...and some basic amateur radio stuff re harmonics i first encountered in the 60s which still applies today....http://www.arrl.org/files/file/Techn...age/Hallas.pdf.

Last edited by Danny G; 6th December 2011 at 08:59 PM. Reason: additional reference
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  #15  
Old 7th December 2011, 12:26 PM
Mario Facchini Mario Facchini is offline
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Danny, you forgot to add the "Bazinga" at the end
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  #16  
Old 8th December 2011, 02:21 PM
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Jethro H Jethro H is offline
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Quote:
Originally Posted by Owen H View Post
On Qantas, the answer is no.
Going to Cooly, he won't be on Qantas, so he'd have to check the individual airline's policy.
It's a funny policy "... radio transmission..." a GPS is a receiver, not a transmitter. Same as having a phone in "Airplane Mode".

I would guess people take one on board to see where they are and what speed they are doing... all a bit of fun.
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