[amsat-bb] Re: Malaysian airliner puzzle

[Jeff Griffin]

The Transponder has have the ability to be powered off. It can't be allowed
to transmit while on the ground, and also has to be assigned a code from the
air terrific controllers before being activated. Also if it is outside of
the beaconing system's radar(or radio ADSB) interrogating range there would
be no data anyway.  I do like the black box idea though.

73 Jeff kb2m

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Joe
Sent: Monday, March 17, 2014 1:40 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Re: Malaysian airliner puzzle

What I do not understand is why the Transponder is capable of being shut off
at all?

That thing as soon as the plane is powered up should start transmitting, and
continue to do so till the plane is shut down. And have no way anyone can
shut it off in any way.

Why does something like this seem sooo simple?

Then The the "Black Box" There is also no reason what so ever that it has to
be the only recording of the planes parameters. Sure record it, no problem,
BUT... there is no reason why this can not be transmitted live or compressed
and transmitted in packets to ground stations to save. This way if a plane
goes down you do not need to "Recover" the "Black Box" every bit of data is
already on the ground saved.

Again Like DUH?

Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 3/17/2014 12:22 PM, Nitin Muttin wrote:
> 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.bd5rv at gmail.com>
>> To: amsat-bb <amsat-bb at 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.bd5rv at gmail.com
>> MSN:    bd5rv at jsdxc.org
>> Skype:  michael-bd5rv
>>
>>
>> On Mon, Mar 17, 2014 at 4:27 AM, James Duffey <jamesduffey at 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 <wb3csy at 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" <ajapha at 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
>>>>>
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