(meteorobs) To: Dr. Tony Phillips

Raydel Abreu (CM2ESP) cm2esp at gmail.com
Mon Nov 18 09:07:11 EST 2013


Wow Jay,

I really hope you can continue with that project. It would be great if it
can be received here in Cuba, but I guess your location is too far from me.

Good luck on the project.

Raydel


2013/11/15 Jay Salsburg <jsalsburg at bellsouth.net>

> 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.
> >
> >
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> >
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