Ask a question - edaboard.com
elektroda.net NewsGroups Forum Index - Electronics Equipment - AM radio reception inside passenger planes?
Goto page Previous 1, 2, 3, 4, 5, 6
Bill Turner
Guest
Guest
Thu Dec 30, 2004 4:42 pm
On Wed, 29 Dec 2004 16:44:01 -0800, "Joel Kolstad"
<JKolstad71HatesSpam_at_Yahoo.Com> wrote:
Quote:
Why is an AM/FM radio receiver potentially more dangerous than laptop PCs,
gameboys, DVD players, and other electronic devices that are used quite
routinely on airplanes?
___________________________________________________________
gameboys, DVD players, and other electronic devices that are used quite
routinely on airplanes?
___________________________________________________________
For one thing, they have an antenna which can transmit as well as
receive, although poorly compared to a *real* antenna. How much
radiation depends on the design of the radio. A cheapo one could be
pretty bad.
--
Bill, W6WRT
Caveat Lector
Guest
Guest
Wed Jan 05, 2005 8:35 pm
"Joel Kolstad" <JKolstad71HatesSpam_at_Yahoo.Com> wrote in message
news:_N-dnfB8FZVo3kHcRVn-sA_at_comcast.com...
Quote:
"Dave VanHorn" <dvanhorn_at_dvanhorn.org> wrote in message
news:MtidnfyW_MfQ507cRVn-ow_at_comcast.com...
The other devices may have circuits that incidentally radiate a little
noise in the aircraft VHF band.
A broadcast FM receiver almost certainly has an oscillator running by
design, in the band.
Where it lands in the aircraft band, is determined by where it's tuned
to.
Ah... you're thinking... FM broadcast range is 88-108MHz... with a 10.7MHz
IF... a high side LO is at ~98-118MHz, easily landing within the aircraft
band (which is... 108-??? MHz, right?).
The original poster is long gone -- refused any info and advice we gave him
news:MtidnfyW_MfQ507cRVn-ow_at_comcast.com...
The other devices may have circuits that incidentally radiate a little
noise in the aircraft VHF band.
A broadcast FM receiver almost certainly has an oscillator running by
design, in the band.
Where it lands in the aircraft band, is determined by where it's tuned
to.
Ah... you're thinking... FM broadcast range is 88-108MHz... with a 10.7MHz
IF... a high side LO is at ~98-118MHz, easily landing within the aircraft
band (which is... 108-??? MHz, right?).
The original poster is long gone -- refused any info and advice we gave him
including a list of airlines that prohibit AM/FM radios and other devices
And the FAA stance on the matter
Must have been 50+ responses
So I guess we can put this to bed
--
Caveat Lector
Joel Kolstad
Guest
Guest
Wed Jan 05, 2005 8:45 pm
"Dave VanHorn" <dvanhorn_at_dvanhorn.org> wrote in message
news:MtidnfyW_MfQ507cRVn-ow_at_comcast.com...
Quote:
The other devices may have circuits that incidentally radiate a little
noise in the aircraft VHF band.
A broadcast FM receiver almost certainly has an oscillator running by
design, in the band.
Where it lands in the aircraft band, is determined by where it's tuned to.
noise in the aircraft VHF band.
A broadcast FM receiver almost certainly has an oscillator running by
design, in the band.
Where it lands in the aircraft band, is determined by where it's tuned to.
Ah... you're thinking... FM broadcast range is 88-108MHz... with a 10.7MHz
IF... a high side LO is at ~98-118MHz, easily landing within the aircraft
band (which is... 108-??? MHz, right?).
Terry
Guest
Guest
Sun Feb 06, 2005 10:09 pm
Quote:
If you stretch a string on a globe from London to Florida, it will show
the 'great circle' route that's the shortest, and that should be your
plane's path, barring storme, hurricanes, etc. You'll see that it comes
really close to the eastern Canadian provinces.
In fact the Avalon Peninsuala in the most eastern part of the island portion
the 'great circle' route that's the shortest, and that should be your
plane's path, barring storme, hurricanes, etc. You'll see that it comes
really close to the eastern Canadian provinces.
In fact the Avalon Peninsuala in the most eastern part of the island portion
of the province of Newfoundland and Labrador, Canada, is a 'Way Point' for
many transatlantic flights headed to/from Europe.
Clear days Transatlantic flight con-trails, at 30,000 feet etc. can be seen
almost continuously.
That is why so many of the flights that were prevented from entering US air
space 9/11 had to land in eastern Canada.
Many US/Canada friendships were founded between grounded travellers that day
and eastern and western Canadians who voluntarily accommodated them during
the delay.
Cape Spear near St John's is the most easterly point in North America.
Marconi received the first transatlantic wireless telegraph signal near St
John's in Dec. 1901.
French is one of the 'Official Languages' in Canada. A significant
percentage of the population, mainly in Quebec, New Brunswick, but also
elsewhere in Canada, is French speaking. Many/most are bilingual.
Same way Spanish is significant in the USA?
The word 'Cajun' in southern US comes from the French word "Acadian";
originally inhabitants of Acadia or what is now the eastern Canadian
Province of Nova Scotia.
Terry.
PS. Staff at the National Historic Park at Signal Hill, St. John's, which
incorporates the memorial and events which celebrate Marconi's first
wireless telegraph reception say that visitors unaware of the approximately
1800 miles across the Atlantic, (4.3 hours by jet to London-Heathrow) will
sometimes ask "Can you see across to England/Ireland etc.". The answer is;
"No, but sometimes you can see "Whales"!
And sometimes icebergs as well.
elektroda.net NewsGroups Forum Index - Electronics Equipment - AM radio reception inside passenger planes?
