[meteorite-list] Listening to Meteors...

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From: mark ford <markf_at_meteoritecentral.com>
Date: Thu Apr 22 10:21:07 2004
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B31014300_at_s-southern01.s-southern.com>

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Hi List,
=20
I have recently been playing around with 'Listening to meteors' using a
radio receiver and thought I would share my findings....
=20
For those interested here is what you do :
=20
1. Get a radio with 'USB' (upper Side band) a radio such as a 'Scanner'
or good shortwave receiver will do (with a reasonable antenna)
=20
2. Tune the radio to a station that just below your Horizon (i.e >60
miles away) and that is transmitting a 'continuous tone' (such as a
television 'carrier' signal which sounds like a continuous tone), in
the UK ~48.25 Mhz is good since this is east Europe's television
frequency, (but you will probably need to search on the net for a
station that is just below your horizon)
=20
3. Having Tuned the radio to a continuous station, you Listen for
changes in the tone, when a meteor arrives it reflect some of the radio
signal and causes you to hear a distinct 'PING' as the signal is
altered by the smoke trail.
=20
You can expect to typically hear about 10 meteors per hour on a typical
day, but during a meteor shower even as many as 1 every several seconds!
But of course most of them simply burn up well before reaching the
ground.
=20
Now If only we had some way of logging time against particularly loud
pings over a large area then we might be able to prove a fall took place
at a certain time, if witnesses knew the time of a fall we could go back
and double check the records! Maybe even an automated email alert system
telling us of possible new falls!=20
=20
Hope this is of some interest to someone, it really is fun to do on a
rainy Sunday afternoon!
=20
Mark Ford
=20
=20
=20
=20
=20
=20

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Hi List,<o:p></o:p>

<o:p> </o:p>

I have recently been playing around with =
‘Listening to
meteors’ using a radio receiver and thought I would share my =
findings….<o:p></o:p>

<o:p> </o:p>

For those interested here is what you do :<o:p></o:p>

<o:p> </o:p>

1. Get a radio with ‘USB’ (upper Side =
band)  a =
radio such as
a ‘Scanner’ or good shortwave receiver will do (with a =
reasonable
antenna)<o:p></o:p>

<o:p> </o:p>

2. Tune the radio to a station that just below your =
Horizon (i.e >60 miles away) and that is transmitting a =
‘continuous
tone’ (such as a television ‘carrier’ signal which =
sounds
like a continuous tone),  in the UK ~48.25 Mhz is good since this is east Europe’s =
television
frequency,  (but you will =
probably
need to search on the net for a station that is just below your =
horizon)<o:p></o:p>

 <o:p></o:p>

3. Having Tuned the radio =
to a
continuous station, you Listen for changes in the tone, when a meteor =
arrives
it reflect some of the radio signal and causes you to hear a distinct =
  ‘<st1:p=
lace>PING</st1:plac=
e>’ as
the signal is altered by the smoke trail.<o:p></o:p>

<o:p> </o:p>

You can expect to typically hear about 10 meteors per =
hour
on a typical day, but during a meteor shower even as many as 1 every =
several seconds!
  But of course most of them =
simply burn up
well before reaching the ground.<o:p></o:p>

<o:p> </o:p>

Now If only we had some way of logging time against =
particularly
loud pings over a large area then we might be able to prove a fall took =
place at
a certain time, if witnesses knew the time of a fall we could go back =
and
double check the records! Maybe even an automated email alert system =
telling us
of possible new falls! <o:p></o:p>

<o:p> </o:p>

Hope this is of some interest to someone,
it really is fun to do on a rainy Sunday =
afternoon!<o:p></o:p>

<o:p> </o:p>

Mark Ford<o:p></o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

 <o:p></o:p>

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=00
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Received on Wed 23 Jul 2003 05:14:16 AM PDT

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