Listening to ATC on a commercial flight
bar...@wharton.upenn.edu
that one can listen to the aircraft/ATC communications on. Does
anyone out there know
a) Which airlines still do this?
b) Which aircraft are so equipped?
By the way, Air Atlantic ( a partner carrier to Canadian) had a
"open cockpit" program on three out of my four flights. About
five minutes after takeoff, the captain opened up the door and
invited everyone who was interested to come on up. Not a bad
way to spend an hour or so on a Dash-8.
-- Dave Baran
Andrew Greenshields
question. It seems like the closest I am going to get to the flight
deck is listening to the ATC, which leads me to my next question,
which has just been asked by someone else!
Is American Airlines one of those that put the ATC communications on
one of the audio channels? If not, will they do it if I request it
and which of the crew would be the best person to ask?
Thanks!
--
Andrew J. Greenshields N3IGS | "It looks like the top part fell on
dxa...@cyber.widener.edu | the bottom part." - Dan Quayle
dxa...@cs.widener.edu | ****** STANDARD DISCLAIMERS APPLY ******
===============================================================================
Len Fishler
have repeatedly asked to have ATC put on one of the audio channels.
After getting a snow job several times ("uh, I'll ask the captain"
followed by "he says we're not equipped to do that"), I decided to
bypass the stewardess and wrote a note for her to give the captain,
which I gave to her on initial boarding. I did allow her to read
it, since initially she looked quite worried (I guess she thought
I was giving a hijack request or something). In the note, I
explained that I was an instrument rated private pilot, and was
interested in following along using my own charts. The net result
was that I got an invite up to the cockpit prior to takeoff, and
got to chat with the crew while they were running their pre-flight
checklists, and were copying their clearence. I was careful NOT
to talk while they were working, but got to ask quite a few
questions about the systems on the DC-10. It was also explained to
me that the "bureaucrats" in the home office at AA had decided to
not allow ATC on the audio channels. The explanation was that they
were worried that they would get unknowlegeable passengers upset,
possibly resulting in lawsuits. Yet another blow against reason
due to our suit-happy society. I have since used the note method
several times to get to visit the cockpit before or after the flight,
including a recent peek, unfortunately too brief, at the new MD-11
glass cockpit. Once they get their clearance to push back, they have
to close the cockpit, and you've got to skedaddle back to your
seat.
- Len Fishler -
PP-ASEL-IA
Mary Shafer
flight doesn't, asking a cabin attendent to ask the cockpit for
it will almost always produce it. I write "almost always" as a
hedge, but it's always worked for me. Ask about this when the
cabin attendent is not frantically busy. Halfway through the meal
service in a 90-minute flight on a full airplane is not the time.
--
Mary Shafer DoD #0362 KotFR NASA Dryden Flight Research Facility, Edwards, CA
sha...@rigel.dfrf.nasa.gov Of course I don't speak for NASA
"There's no kill like a guns kill." LCDR "Hoser" Satrapa, gunnery instructor
"A kill is a kill." Anonymous
Wolfgang Diestelkamp
[ ... ]
> Is American Airlines one of those that put the ATC communications on
> one of the audio channels? If not, will they do it if I request it
> and which of the crew would be the best person to ask?
And how about Delta (I'll have quite a few hours on Delta soon) ?
E-mail answers ok.
--
Wolfgang Diestelkamp
wolf...@prosun.first.gmd.de
diest...@kmx.gmd.dbp.de
Jon Allen
>United almost always puts ATC on channel 9. If that particular
>flight doesn't, asking a cabin attendent to ask the cockpit for
Yeah, I will second that. I think I have had ATC on every United flight
this last year except one - Denver to Phoenix I believe. The pilot
had a football game on Channel 9 and wouldn't budge..... :-(
-Jon
Robert Steven Glickstein
> It was also explained to
> me that the "bureaucrats" in the home office at AA had decided to
> not allow ATC on the audio channels. The explanation was that they
> were worried that they would get unknowlegeable passengers upset,
> possibly resulting in lawsuits. Yet another blow against reason
> due to our suit-happy society.
Arrrrgh! AAAARRRRRRRRRRGGHHHHHH!
I'm mad as hell and I'm not gonna take it anymore!
Medical care costs too much! Flying costs too much! Car insurance
costs too much! Lawyers are too rich! Courts are too busy!
Contracts are too complex! Litigaphobia unfairly limits what the
service and manufacturing industries have to offer me!
--->>> ** TORT REFORM ** <<<---
What can a fed-up, pissed-off solitary citizen do?
[ob. rec.av: the three most useless things in aviation are footballs,
rutabagas, and 78 RPM records]
______________ _____________________________
Bob Glickstein | Internet: bo...@andrew.cmu.edu
Andrew Toolkit Consortium | Bitnet: bobg%and...@cmuccvma.bitnet
Carnegie Mellon University | UUCP: ...!harvard!andrew.cmu.edu!bobg
Pittsburgh, PA 15213-3890 |
(412) 268-6743 | Atomic batteries to power... turbines to speed!
William LeFebvre
|> I decided to
|> bypass the stewardess and wrote a note for her to give the captain,
|> which I gave to her on initial boarding.
Hey, I don't even bother with the note. If I'm boarding a plane
that boards at the front (727, 737, etc), I just step in to the
cockpit and say "Hi, I'm a private pilot". The flight crew has
*always* instantly warmed up to me. The last time I took a DC10
(which boards at the front of coach), I just said to the stewardess
that I wanted to visit the cockpit and just started walking that
way. She said "okay" and I went on my way.
I would not recommend this if you are one of the last people to
board (especially if the flight is late and they are in a hurry).
I always ask the captain during my visit to have ATC put on an audio
channel. The time I flew American, the captain also told me that it
is now American's company policy to not put ATC on an audio channel.
I have only been turned down on United once, and the captain was so
nice otherwise that I didn't even get upset: he let me borrow his
"captains atlas" for half the flight (this is a state by state road
atlas with the high altitude "J" routes and VORs superimposed on it).
In the future, I'm thinking about asking them "if I had a handheld
scanner or transceiver with me, would you let me use it to listen
to the aviation frequencies?" If I get enough "yes" answers, I may
have yet another excuse to go buy one.
William LeFebvre
Computing Facilities Manager and Analyst
Department of Electrical Engineering and Computer Science
Northwestern University
<ph...@eecs.nwu.edu>
Paul Walczak
>
>In the future, I'm thinking about asking them "if I had a handheld
>scanner or transceiver with me, would you let me use it to listen
>to the aviation frequencies?" If I get enough "yes" answers, I may
>have yet another excuse to go buy one.
>
what's the difference between this and say a standard FM walkman? I've
listened to FM plenty of times. What's the difference between listening
to 108.0 and 118.0 ???
Paul "Gee I hope I didn't cause any problems" Walczak
-
-
Berry Kercheval
William> In article <1992Feb26.0...@tandem.com>, fishl...@Tandem.com (Len Fishler) writes:
William> Hey, I don't even bother with the note. If I'm boarding a plane
William> that boards at the front (727, 737, etc), I just step in to the
William> cockpit and say "Hi, I'm a private pilot". The flight crew has
William> *always* instantly warmed up to me.
Since I almost always arrive too early for commercial flights (one of
my recurrent nightmares is arriving at the gate just as they push back
for the flight to Europe where I'm supposed to pick up my billion
dollar lottery winnings, and if you're not there in person on time it
goes to the next person... where was I?...) I usually get to see the
crew board the plane. One approach that's worked is to tell the head
cabin attendant I'm a pilot and would like to board early to chat with
the crew, if it's OK with the captain. Sometimes directly asking the
captain works too -- he said he'd send a stewardess out to get me in a
few minutes and she did and we had a real nice chat...
--berry
--
Berry Kercheval :: Protocol Engines Inc :: be...@pei.com
"One of the main advantages of Unix over, say, MVS, is the tremendous number
of features Unix lacks." -- Chris Torek
"Fixed in SVR4" -- USL
Jim Lathrop
I believe that it is illegal to operate a transmitter OR receiver on
any US flight. (period)
--
James Lathrop
Iowa State University
j...@iastate.edu
Ed Falk
In fact, I'd be surprised if it was legal to operate a computer,
despite what you see in the ads.
Don't have the rulebook handy, but basicly, it's illegal to operate
a transmitter or receiver in any aircraft unless the operator or
pilot has determined that it's ok; and in the case of an airline,
only the operator, not the pilot, can give you permission.
Most modern receivers transmit slightly as well as receive. Typically,
in this frequency range, they transmit at the recieve frequency plus
10.7 Mhz. So if you're listening to Rock 105.1, you're transmitting
on 115.8, right in the middle of the navigation band. Don't do this
on a foggy day in San Francisco.
-ed falk, sun microsystems
sun!falk, fa...@sun.com
"Towards the end, the smell of their air began to change"
Ron
> *always* instantly warmed up to me.
Yep, it usually gets you some level of recognition. I also got
to sit in the right seat of a Bizjet coming out of Kansas City
and in the right seat of a DC-3 in Africa (possibly the most fun
I've had in a plane). I've also asked and have spent a couple
of hours screwing around in a 767 cockpit playing with the nav
systems and stuff on the ground on a freighter (I took the crew
down to Denny's while they were waiting for the turnaround).
I've noticed that professionals usually respect people who have
some commitment to their profession. I've gotten neat tours of
medical and fire facilities because I've mentioned I was a volunteer
fireman/paramedic. I've also gotten into the NBC and ABC transmitter
sites at the Empire State building by admitting I had a radio
telephone license and was engineer at a college radio station (I
was also a student).
It never hurts to ask.
-Ron
Ron
> scanner or transceiver with me, would you let me use it to listen
> to the aviation frequencies?" If I get enough "yes" answers, I may
> have yet another excuse to go buy one.
This one comes up every six months or so. It's illegal. The rules
prohibit the operation of these radios in flight. The rules also
prohibit the crew from granting exceptions (the regs say operator
which means airline). Any pilot who let you is likely to be in
big trouble if the airline finds out.
-Ron
Tom R. Myers
> to 108.0 and 118.0 ???
Well for one thing, aviation Comm is AM.
Besides that minor point, the radiated radio frequency energy from a typical
portable radio is in the same ballpark as the Nav signal strength.
TRM N1005E
Karl Swartz
>flight doesn't, asking a cabin attendent to ask the cockpit for
>it will almost always produce it.
I've had rather mixed luck on United. On rare occasions it's there
without a query. Asking has gotten ATC maybe half the time. Once,
the FO on one of the new planes (737-300/-500 or 757, I can't recall)
said he wouldn't mind but the captain didn't like it. Another time
the captain hedged for a moment then said it was broken -- this on a
2-month old 737-522 that had been working quite nicely when I was on
the same aircraft several weeks previously. If there's a pattern, I
would have to say it's more likely on the bigger planes, perhaps the
older pilots are more willing.
In fairness, some aircraft don't seem to be equipped for this. Last
fall, United had two 747 round-trips per day between ORD and SFO (and
one to Dulles; the planes are now needed to fly to Rio de Janiero and
beyond) and on one of these flights we had one of the "new" 747-238Bs
from QANTAS. An extended maintenance delay at O'Hare gave me a chance
to get a tour from a FA I know well followed by a chat with the FO. I
asked about ATC and he said he'd be happy to but the -238Bs don't seem
to have the connection to the audio system.
Of course, the last time I was on one of the elderly 727-22s there was
no ATC either -- nor any audio at all!
--
Karl Swartz |INet k...@ditka.chicago.com
1-415/854-3409 |UUCP uunet!decwrl!ditka!kls
|Snail 2144 Sand Hill Rd., Menlo Park CA 94025
"YOU try supporting 80 users on a steam-powered abacus!" (Alan Kaplan)
Christopher Schulte
>I've heard from friends that some airlines still have an audio channel
>that one can listen to the aircraft/ATC communications on. Does
>anyone out there know
>
> a) Which airlines still do this?
> b) Which aircraft are so equipped?
Last time I flew American Airlines they were putting ATC on the "back
seat" headphones. That was about 6 Months ago. On a DC-10 most 737 do
not have headphone adapters. If the airplane is equiped, you can always
ask the FE/Copilot, and they'll be glad to put it on!!
Chris.
RV-6 #21390
San Jose CA
Ron
> what's the difference between this and say a standard FM walkman? I've
> listened to FM plenty of times. What's the difference between listening
> to 108.0 and 118.0 ???
Not much difference, your violating the regs either way. You are not
supposed to be using the radio part of your walkman on the flight at
all.
-ROn
Les Niles
> Most modern receivers transmit slightly as well as receive. Typically,
> in this frequency range, they transmit at the recieve frequency plus
> 10.7 Mhz. So if you're listening to Rock 105.1, you're transmitting
> on 115.8, right in the middle of the navigation band. Don't do this
> on a foggy day in San Francisco.
This works in sort-of reverse, too: If I listen to KROQ, FM 97.3,
Palo Alto tower can be heard transmitting on 118.6, because the
receiver local oscillator is at 97.3+10.7 = 109.0 MHz, and 118.6-109 is
close enough to 10.7. I have to be driving right by the tower for this
to work, but it was quite a surprise the first time it happened.
-les ni...@parc.xerox.com
N2461G
Skip Guild
>scanner or transceiver with me, would you let me use it to listen
>to the aviation frequencies?" If I get enough "yes" answers, I may
>have yet another excuse to go buy one.
I've tried this with both scanners and transceivers. A ban on transceivers
obviously makes sense and I don't even try any more. (Try falling asleep
and pressing down on the transmit button!)
The usual (litigious) response is a FAR (I'm not taking the time to look it
up) which prohibits all electronic devices not approved by the FAA from
being operated on an airliner. This same FAR really gave fits for portable
PC users until each airline company tested the devices for impact on
navigation equipment. I've even asked for permission from the captain and
was always refused because a malfunctioning scanner _could_ interfer with
their navigation equipment. Would you take this kind of lawsuit risk as
captain just to please a passenger you'll never see again?
Kevin Ford
>>In the future, I'm thinking about asking them "if I had a handheld
>>scanner or transceiver with me, would you let me use it to listen
>>to the aviation frequencies?" If I get enough "yes" answers, I may
>>have yet another excuse to go buy one.
>The usual (litigious) response is a FAR (I'm not taking the time to look it
>up) which prohibits all electronic devices not approved by the FAA from
>being operated on an airliner. This same FAR really gave fits for portable
>PC users until each airline company tested the devices for impact on
>navigation equipment. I've even asked for permission from the captain and
>was always refused because a malfunctioning scanner _could_ interfer with
>their navigation equipment. Would you take this kind of lawsuit risk as
>captain just to please a passenger you'll never see again?
During the past two years or so, I have been given permission by the
captain to listen to my portable scanner (not a transceiver) during the
flight every time I have asked (about a half a dozen times). I simply
talk to the captain before the flight, tell him I'm a pilot and show him
the scanner. I had assumed this was legal, as FAR 91.21 (b) (5) seems
to indicate that if the operator of the aircraft OK's the use of the
scanner, then there is no problem. Several posters have claimed that
listening to scanners on airliners is verboten by federal law.
Is there something in Part 121 that specifically prohibits portable radios?
Kevin Ford
fo...@symcom.math.uiuc.edu
Brent Chapman
>This works in sort-of reverse, too: If I listen to KROQ, FM 97.3,
>Palo Alto tower can be heard transmitting on 118.6, because the
>receiver local oscillator is at 97.3+10.7 = 109.0 MHz, and 118.6-109 is
>close enough to 10.7. I have to be driving right by the tower for this
>to work, but it was quite a surprise the first time it happened.
I don't think it has anything to do with what frequency you were listening
to. PAO tower currently has a VERY bad signal leakage problem on the tower
(118.6) frequency; it's been that way for about 3 months now. It's so bad
that in the CAP building near the tower, our VCR (which is NOT connected to
an antenna; it's just for tape playback) goes bananas every time the tower
keys the mic.
-Brent
Eddie Van Huffel
> m12...@mitre.org (Skip Guild) writes:
>
> >>In the future, I'm thinking about asking them "if I had a handheld
> >>scanner or transceiver with me, would you let me use it to listen
> >>to the aviation frequencies?" If I get enough "yes" answers, I may
> >>have yet another excuse to go buy one.
>
> >The usual (litigious) response is a FAR (I'm not taking the time to look it
> >up) which prohibits all electronic devices not approved by the FAA from
> >being operated on an airliner. This same FAR really gave fits for portable
> >PC users until each airline company tested the devices for impact on
> >navigation equipment. I've even asked for permission from the captain and
> >was always refused because a malfunctioning scanner _could_ interfer with
> >their navigation equipment. Would you take this kind of lawsuit risk as
> >captain just to please a passenger you'll never see again?
>
As with most of these regulations, something happened to have them written.
There was either in the '60s or '70 an airline crash in which the cause was
a faulty portable radio which interfered with the navigation equipment.
Several tests were held and found that by the manufacturing standards of the
time, these radios emitted signals which interfered with navigation, and
threw off the pilots judgement. Thus regulations were written and are
somewhat enforced. Todays standards of manufacturing radios, scanners, and
computers should be reassessed, and possibly the rules rewritten, except
that, since Murphy is my brother, someone would board an airplane with an
old radio which would throw everything awry, cause another crash, and null
and void everyones efforts to change the rules.
--
ed...@railnet.nshore.ncoast.ORG (Eddie Van Huffel)
Railnet BBS +1 216 883 6298
Richard J. Miller
>I've had rather mixed luck on United.
>
well, let me tell this one one more time. this story was told to me by
a senior DC-10 check pilot for United.
a bunch of the United drivers that come out of Chicago tend to be VERY
leery about putting ATC on the cabin, especially during takeoff and
landing. seems some passenger paniced one time on an Untied flight and
opened one of the doors while the aircraft was rolling out because he
heard the tower tell the pilot they had a brake fire in progress. brake
fires are not necessarily common nor good, but they don't cause any real
structural problems either and usually just blow out after a minute.
besides, what can you do on rollout anyway? but after the p[anic, they
ended up blocking a runway for a couple hours while they carted off 10
injured people and then a 727 with all the slides down.
Rich Miller
rmi...@i88.isc.com
{sun, amdahl, att (maybe)}!laidbak!rmiller
Nancy Suffron
>flight doesn't, asking a cabin attendent to ask the cockpit for
>it will almost always produce it. I write "almost always" as a
>hedge, but it's always worked for me. Ask about this when the
>cabin attendent is not frantically busy. Halfway through the meal
>service in a 90-minute flight on a full airplane is not the time.
Whether channel 9 is available on United is up to the captain. I
was sitting by an off-duty pilot on a recent flight who explained
that he knew of one captain that doesn't allow it any more because
of a bad experience he had.
It seems that someone heard that there was a fire on a plane. The
plane on fire was still on the ground at the time, while her plane
was in flight. The woman thought they were talking about her plane
and she screamed, "Fire!"
As he told the story, it took quite a while to get things back to
normal and people settled down. It left a rather bad taste in the
captain's mouth, so he refuses to allow ATC in the cabin.
If you would like to ask about ATC, a good time to do so is as you
are boarding. Often you can ask the cockpit crew directly.
Nancy
------------------------------------------------------------------
Nancy Suffron |
PP-ASEL | still looking for a cute .sig
Informix Software, Inc. |
------------------------------------------------------------------
Jim Schinnerer
> despite what you see in the ads.
We all know how "clean" computers are don't we... Just put your
PC next to your TV... Hmmmm....
> Most modern receivers transmit slightly as well as receive. Typically,
> in this frequency range, they transmit at the recieve frequency plus
> 10.7 Mhz. So if you're listening to Rock 105.1, you're transmitting
> on 115.8, right in the middle of the navigation band. Don't do this
> on a foggy day in San Francisco.
All regs aside, I have my walkman on 105fm and I am transmitting
on 115. Given that a walkman works more than 20 hours on a set of
batteries, and that most of that energy goes into the sound production,
AND the fact that I am enclosed by a tube of conductive material, AND
the nav antenna is outside that tube of metal....
....It just doesn't matter.
---------------------------------------------------------
Jim Schinnerer - PP-ASEL-IA | Hewlett Packard
Mooney - 350X - "Buster" | Cupertino, CA
Hang IV - Magic KISS | (408) 447-6319
email - schi...@hpihoah.HP.COM |
---------------------------------------------------------
Reece R. Pollack
Last time I flew commercial (United), I asked the Captain to put ATC on
the cabin audio, and he seemed to be really leery of doing so. After I
pestered him a bit, he agreed to put it on late in the flight. I assumed
this was so the other passengers could listen to the normal program, but
later realized what he was up to -- he only put ATC on *after* the stews
had collected everyone else's headsets.
I'm headed down to Texas (from Maryland) tomorrow, and I'll see what kind of
luck I have on American.
--
Reece R. Pollack
Student Pilot -- Warrior N7022C
Playing in the grass at 41 hours...
John J. Starkenberg
>fo...@symcom.math.uiuc.edu (Kevin Ford) writes:
>
>As with most of these regulations, something happened to have them written.
And is still happening.
>There was either in the '60s or '70 an airline crash in which the cause was
>a faulty portable radio which interfered with the navigation equipment.
I am sure I recently read an ASRS report in which the captain, after
experiencing navigation difficulty detected by atc, sent a flight attendant
back to the cabin to find a passenger operating some kind of device. After
the passenger was asked to turn off the device, the navigation equipment
resumed normal operation.
>somewhat enforced. Todays standards of manufacturing radios, scanners, and
>computers should be reassessed, and possibly the rules rewritten, except
>that, since Murphy is my brother, someone would board an airplane with an
>old radio which would throw everything awry, cause another crash, and null
>and void everyones efforts to change the rules.
What makes you think current radios are any better? The above mentioned
incident happened recently, although it may not have involved a radio.
*******************************************************************************
* _________|_________ Dr. John Starkenberg js...@brl.mil *
* \(*)/ Explosive Effects/Terminal Ballistics *
* ) ( US Army Ballistic Research Laboratory *
* O O Aberdeen Proving Ground, MD 21005 (410) 278-6214 *
*******************************************************************************
Bill Buse
> In article <SHAFER.92F...@rigel.dfrf.nasa.gov> sha...@rigel.dfrf.nasa.gov (Mary Shafer) writes:
>>United almost always puts ATC on channel 9. If that particular
>>flight doesn't, asking a cabin attendent to ask the cockpit for
>
> this last year except one - Denver to Phoenix I believe. The pilot
> had a football game on Channel 9 and wouldn't budge..... :-(
Almost every United flight that I've been on with the audio system in
recent years has had ATC on channel 9. A couple of times I've even
heard more than ATC on channel 9, such as one time when I heard this
voice calling out what sounded like radar altimeter numbers as we
were crossing the runway threshold. What I heard was 50...40...30...
20...10 as we were at the appropriate distances above the ground.
Another time I heard a crew member talking to a ground crew person
as we were being pushed back from the gate and receiving clearance
to start engines. :-)
Bill Buse
w...@hpisla.lvld.hp.com
Loveland, CO
Tom Wilson
plane's equipment?
Tom
Ron
> to indicate that if the operator of the aircraft OK's the use of the
> scanner, then there is no problem. Several posters have claimed that
> listening to scanners on airliners is verboten by federal law.
The problem is that on airliners the pilot is not the operator. The
term operator here means the airline. I don't know of any airline
that allows receivers to be used in flight (or vests any discretion in
the pilot to do so).
-Ron
Julian E. Gomez
" During the past two years or so, I have been given permission by the
" captain to listen to my portable scanner (not a transceiver) during the
" flight every time I have asked (about a half a dozen times). I simply
" talk to the captain before the flight, tell him I'm a pilot and show him
" the scanner. I had assumed this was legal, as FAR 91.21 (b) (5) seems
" to indicate that if the operator of the aircraft OK's the use of the
" scanner, then there is no problem. Several posters have claimed that
" listening to scanners on airliners is verboten by federal law.
" Is there something in Part 121 that specifically prohibits portable radios?
Part 1, actually. The PIC is not the operator.
--
If it wasn't for civil disobedience this country wouldn't exist.
Julian "a tribble took it" Gomez
j...@netcom.com
Dave Medin
|> What effect then, if any, would walkman-like devices have on the
|> plane's equipment?
If the walkman-like device contained a radio, that radio has several
oscillators in it known as "local oscillators" which serve to
beat down (heterodyne) the received signal down to a more
easily demodulated (and filtered, in the process) lower frequency
signal. One of the worries is that local oscillator emissions
or harmonics may fall on top of another RF service that the aircraft
is using to navigate. Note that your entertainment radios contain
FCC type-acceptance ratings (and they're supposedly receivers). The
local oscillator emissions are what motivate this.
A long time ago, Popular Electronics had plans for a non-heterodyning
crystal aircraft receiver to use onboard aircraft.
--
------------------------------------------------------------------------
Dave Medin Voice: (205) 730-5812
Intergraph Corp. (205) 837-1174
M/S CR1104
Huntsville, AL 35894-0001 Internet: me...@catbyte.b11.ingr.com
*********Everywhere You Look...(at least around my office)***********
*The opinions here are strictly my own (or those of my machine)
ri...@ttd.teradyne.com
Could make a NAV receiver unusable, if it's an FM Broadcast band receiver.
(If it's a cassette or cd walkman only, no problem). An FM broadcast band
receiver contains an oscillator that operates at a 10-12Mhz offset from the
received frequency (depending on the receivers IF frequency). If the walkman
were tuned to 107.5, the oscillator could be running at 118.3, for example.
If tuned to 100.1, it could be radiating a signal at 110.9 (which I think is
an ILS frequency - don't have my tables here).
This is why certain electronic devices are banned from use aboard commercial
flights.
--
John Rice K9IJ | "Did I say that ?" I must have, but It was
ri...@ttd.teradyne.com | MY oppinion only, no one elses...Especially
(708)-940-9000 - (work) | Not my Employers....
(708)-438-7011 - (home) |