Sorry if off topic. Looks like it is all three 121.5 / 243/ 406
http://www.acrartex.com/products/catalog/elts-commercialmilitary/b406-4/ If the aircraft did crash in Bay of Bengal / Indian ocean and ELT operational the signals would have been picked up by satellites .http://inmcc.istrac.org/brochurehtml/index.htm 73 Nitin [VU3TYG] >________________________________ > From: Nitin Muttin <vu3...@yahoo.co.in> >To: amsat-bb <amsat-bb@amsat.org> >Sent: Monday, 17 March 2014 10:52 PM >Subject: Re: [amsat-bb] Re: Malaysian airliner puzzle > > > >This is really a mystery, wonder what is the ELT frequencies used on modern >aircraft , is it 121.5 Mhz or the new 406 Mhz. > >73 >Nitin [VU3TYG] > > > >>________________________________ >> From: Michael Chen <michael.bd...@gmail.com> >>To: amsat-bb <amsat-bb@amsat.org> >>Sent: Monday, 17 March 2014 8:35 PM >>Subject: [amsat-bb] Re: Malaysian airliner puzzle >> >> >>The distance calculated between the satellite and the plane won't be >>credible if the time on both are not synchronized, even if the >>transmission from the plane is time tagged. As a matter of fact, it's >>quite difficult to keep such an synchronization. >> >> >> >>Michael Chen, BD5RV/4 >>AMSAT-China: http://www.camsat.cn >>----------------------------------- >>Twitter: http://twitter.com/bd5rv >>Email: michael.bd...@gmail.com >>MSN: bd...@jsdxc.org >>Skype: michael-bd5rv >> >> >>On Mon, Mar 17, 2014 at 4:27 AM, James Duffey <jamesduf...@comcast.net> wrote: >>> I think that the transmissions from the airplane are time tagged, even >>> without the data packets being transmitted. By comparing the ping time to >>> the time on the satellite, one can tell how far away the ping is. You can >>> draw a circle with that radius, taking into account fuel available on the >>> airplane and last heading to sort of kind of bound where the airplane is. >>> That is where the red circles in the NY Times article come from. >>> >>> A second satellite is needed to pinpoint a more exact location, but even >>> that will have a relatively position error on the ground. I don't think it >>> is within range of another INMARSAT. Whether or not other assets exist that >>> could receive the signal is a matter of speculation. - KK6MC >>> >>> >>> On Mar 16, 2014, at 2:01 PM, Rick Walter <wb3...@gmail.com> wrote: >>> >>>> Tony, since the satellite cannot tell direction of the Ping, only >>>> distance, the arcs have the same distance from the plane making up a half >>>> circle. You would need to sats to hear the plane, see where the two arcs >>>> cross to determine a location. >>>> >>>> This is the same way seismic stations locate earthquakes. >>>> >>>> Rick - WB3CSY >>>> >>>> Sent from Rick's iPhone 5 >>>> "Great spirits have always encountered violent opposition from mediocre >>>> minds" - Albert Einstein >>>> >>>> >>>> >>>>> On Mar 16, 2014, at 12:24 PM, "Anthony Japha" <aja...@earthlink.net> >>>>> wrote: >>>>> >>>>> Those so-called arcs that are said to be possible routes for the plane >>>>> look much like the outer edge of one of the Inmarsat footprints. Is >>>>> there logic behind the arcs or is it oversimplified nonsense? They are >>>>> said to be the result of the signals Inmarsat received. But then why >>>>> wouldn't it be possible for the plane to be anywhere in the footprint? >>>>> >>>>> I'm sure many in our group have good ideas. I'm not trying to start a >>>>> discussion of the entire mystery, only this one narrow, but possibly >>>>> misleading, aspect related to our hobby. >>>>> >>>>> 73, >>>>> Tony, N2UN >>>>> LM 183 >>>>> >>>>> --- >>>>> This email is free from viruses and malware because avast! Antivirus >>>>> protection is active. >>>>> http://www.avast.com >>>>> _______________________________________________ >>>>> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. >>>>> Not an AMSAT-NA member? Join now to support the amateur satellite program! >>>>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >> >>>> >>>> _______________________________________________ >>>> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. >>>> Not an AMSAT-NA member? Join now to support the amateur satellite program! >>>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >>> >>> >>> _______________________________________________ >>> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. >>> Not an AMSAT-NA member? Join now to support the amateur satellite program! >>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >> >>_______________________________________________ >>Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. >>Not an AMSAT-NA member? Join now to support the amateur satellite program! >>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >> >> >> > > _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
