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#11
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Air travel with radios...
Ian Jackson wrote:
In message , D Peter Maus writes Ian Jackson wrote: In message , dave writes Ian Jackson wrote: In message , Brenda Ann writes wrote in message ... Heading to Hawaii this Christmas and thinking of taking a Sony 2010 -- Any hassles or obvious tips I could use? Thanks! Other than don't turn it on during the flight.. should be no problems. Best to pack it in your checked luggage. Some airlines DO (or, at least, did) allow the use of radio receivers during flight. Virgin is one of them. It may be worth asking. It's interesting to note that, when you travel from the UK to Florida, the first language you are likely to hear on the FM B/C, the USA, is French. I don't know any airline that allows AM/FM radio use at any time. The LO on many FM radios causes radiation in the Navigation band. Trust me, a few years ago, Virgin definitely did allow the use of radio receivers. It was on the list, along with PCs, calculators, electronic games etc. Without a doubt, the top end of the FM B/C band + 10.7MHz does put the LO in the air traffic control band. However, in practice, it's difficult enough to get even FM signals inside the (you have to have a window seat). Even at ~100MHz, the windows are still a bit on the small size. So, I doubt if a relatively weak LO at 120MHz is unlikely to have much impact on the ATC communications. Those guys don't really go in for weak-signal communications. It's not likely to prevent comms, but it can put a heterodyne on top of comms. Which, in a cockpit, on approach in high traffic areas, can be a major distraction. Oh, I agree, it could put a heterodyne on top of comms (especially as they are AM) - and possibly a very unstable one at that. But, as I said, those guys don't really go in for weak-signal communications. It doesn't have to be a weak signal comm for a heterodyne to be a problem. One of the reasons AM is still used for AV com is to avoid the capture effect of FM. If there are two comms on the same channel, a heterodyne lets a pilot, ATC, or Center, know that they're both out there. An unstable heterodyne on top of or even underneath comms in the cockpit in an active traffic area can behave as, or mask, the existence of an actual comm--potentially an emergency situation. Consider also, that AVComm modulation levels are all over the place. ATIS at Gary is often so soft as to be unreadable, even when signal strength is high. A very weak heterodyne originating on the aircraft would severely compromise ATIS reception, which is a precursor to the first radio call. I'm a photographer on a good day, specializing in aerial. And I spend about 2 days a week hanging out of a JetRanger with my Nikons. I monitor traffic with the pilot, and trust me when I tell you, in the Chicago area, a heterodyne on the comm channels is a highly common occurrance. A heterodyne originating on the aircraft would create a distraction that a pilot in traffic simply can't afford. As for Virgin's findings...there's a difference between negligible and zero. It only takes ONE convergence of improbable circumstances to create a real hazard in the air. You don't play odds, here. Presumably Virgin did an assessment of the risk, and decided it was negligible. |
#12
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Air travel with radios...
A few weeks ago, I saw a program on tv about Virgin Airlines.The seats
in the top deck of the Airplanes are mounted diagonally and they convert into beds and there is a privacy curtain too.Nice and cozy. cuhulin |
#13
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Air travel with radios...
Don't Fly!
Did y'all hear about that Killer Amtrack Train.A couple of weeks or so ago, it hit a garbage truck in or near Crystal Springs,Mississippi.(Crystal Springs is about thirty miles South [[South is always Best]] of doggy's couch) Recently, that same Killer Amtrack Tran hit a car in Macomb,Mississippi and less than one hour later that same Killer Amtrack Train hit a car in or near Independence,Louisiana and killed two people who were in that car. DON'T Fly and Stay Far The HELL Away From Amtrack SUCKS! cuhulin |
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