(meteorobs) To: Dr. Tony Phillips

Jay Salsburg jsalsburg at bellsouth.net
Fri Nov 15 17:53:35 EST 2013


Hello Raydel

 

I am still investigating installing a Beacon at a Farm in my area. I have
access to a Farm about 40 miles away. It is possible to operate a Beacon at
50 MHz (100 Watts) without a permit. This has intrigued me for many years
and I am highly motivated to install this device. If anyone reading this has
advice, please express your thoughts.

 

 

I have no experience monitoring echoes reflected by Analog TV transmitter,
but I do have years experience monitoring echoes from the NAVSPASUR
transmitter, along with a good understanding of RADAR.

 

I can guess the reflections off a TV Transmitter must be Doppler noisy, even
though strong reflections are possible, that reflection’s DOPPLER signal
would be non monotonic or rather indistinct in frequency. Also, I am
guessing, it should be possible to discern the attributes you mention in
your post, but the signal return would not be very frequency specific.
Probably the only practical reason to use an Analog TV Transmitter for
forward scatter meteor detection would be only for logging activity and not
the character of the activity, at least for automated logging.

 

For forward scatter meteor detection, powerful Transmitters must be more
than 40 miles away, ideally 90 to 150 miles away. In my case, the NAVSPASUR
Transmitter was 300 miles away, but it was so powerful, I could still
receive significant activity at an antenna angel of about 25 degrees above
the horizon. This shallow angle and extreme distance, however, had an
advantage, it did not receive much unwanted reflections from aircraft.

 

From: meteorobs-bounces at meteorobs.org
[mailto:meteorobs-bounces at meteorobs.org] On Behalf Of Raydel Abreu (CM2ESP)
Sent: Thursday, November 14, 2013 7:51 AM
To: Jean-L. AGR; Meteor science and meteor observing
Subject: Re: (meteorobs) To: Dr. Tony Phillips

 

Hello all,

I listen to the streaming mentioned for a few minutes while checking the
audio on SpectrumLab. 

One thing caught my attention... I could say almost 99.9% was zero doppler
"trail" echoes. 

However, with my current TV system (61.240 MHz) I got almost 90% high
doppler slanted "head" echoes, several ones with both "head" and "trail"
echoes, and just a few "trail" only. Also in my system the echoes are all
with different positions plus and minus offset of the weak direct carrier I
sometimes see.

So, as there is still a lot of theory I don't know can please someone
explain me better the difference between that signals and what I get?
Perhaps the meteors of the streaming are from a very distant location in
reference from the receiver. While in comparison my system is too close to
transmitter, or is it opposite.?

Few captures my system  from this evening. Time is UTC:

https://www.dropbox.com/s/q5i7c6y511ioicr/2013111410_0307.jpg
https://www.dropbox.com/s/0nvzpc3fzzo5qw0/2013111407_0523.jpg
https://www.dropbox.com/s/i4aadmi5vra2czz/2013111405_0538.jpg

Kind Regards,

Raydel, CM2ESP

Havana, Cuba

 

2013/11/14 Jean-L. RAULT <f6agr at orange.fr>

It is a very interesting and fascinating example of LDEs (Long Delayed
Echoes)

Jean-Louis Rault




)Le 13/11/2013 20:58, Jay Salsburg a écrit :
> From: Jay Salsburg
>
> To: Dr. Tony Phillips
>
> http://topaz.streamguys.tv/~spaceweather/
>
> What is this page Streaming? The audio greeting (for this site) claims to
be
> streaming the audio of Meteors from the NAVSPASUR Space Fence RADAR in
> Texas, which is no longer transmitting.
>
>
> _______________________________________________
> meteorobs mailing list
> meteorobs at meteorobs.org
> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>

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