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'[OT] RF Noise'
1998\02\05@000425 by Mike Keitz

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On Wed, 4 Feb 1998 17:48:58 -0500 Tom Gretton <spam_OUTtgrettonTakeThisOuTspamINFORAMP.NET>
writes:
>Some time ago,  a major carrier (Delta, TWA, ?) announced a similar
>prohibition.  I recall the rationale was that there was a critical
>frequency
>in the laser diode driver circuit.

This is definitely not the case.  The laser diode is driven with DC.  In
fact, all the frequencies in the player are rather low, and the
amplitudes small.  The decoder is of course a small computer which could
generate some HF interference, and there are switching power supplies and
motor drivers that might conceivably be a problem at VLF.

I think the reasons would be (1) they want to be sure the passengers can
hear any emergency anouncements and/or (2) they want to sell the on-plane
music instead and/or (3) some CD players have built in radios which could
be a problem.


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1998\02\05@122446 by John Payson

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> I think the reasons would be (1) they want to be sure the passengers can
> hear any emergency anouncements and/or (2) they want to sell the on-plane
> music instead and/or (3) some CD players have built in radios which could
> be a problem.

I've never heard CD players banned on airlines; did the flight in question
perhaps have an in-flight movie?  Many modern airplanes have headphone jacks
in the seats (in addition to those tubey things) and allow passengers who
have brought their own headphones to use them for the same price as the
tubeys.  If a passenger were listening to their own music, it might be hard
for the flight attendants to tell if they were listening to the movie without
paying for it.

nb: I've never paid for an in-flight movie though I have gotten two of them
for free as a result of flights that were delayed.  Unfortunately one of
those flights (which sat on the ground, full of passengers, for hours before
it took off and started the air conditioning) was the evening/night before a
job interview but on the other hand, I would probably otherwise not have seen
the movie Shiloh which I recommend.

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