HRIT and LRIT Low-Cost System

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RSP2user
Posts: 65
Joined: Mon Oct 09, 2017 7:11 am

Re: HRIT and LRIT Low-Cost System

Postby RSP2user » Sun Aug 12, 2018 4:15 pm

Rob,

Some additional information for you to consider. The grid antenna choice was made for this post with careful research and a considerable amount of effort went into testing, modification, and seeing what worked well. The 1 meter diameter grid parabolic antennas, regardless of brand, typically employ a half-wave dipole as the receiving element. So it is not too difficult to modify one to set it to the exact frequency desired. What was found in testing the Premiertek ANT-GRID-24DBI antenna was that the biggest increase in gain in the 1.69GHz frequency range came from simply flipping over the existing secondary reflector as described in the post. Alternate secondary reflectors and optimizing the dipole for 1.69 GHz were also tested. The results were only marginally better, not enough to propose going through all the trouble to make extensive antenna changes, when you can obtain similar results without modifying the dipole and by simply flipping over the existing secondary reflector.

Here are some numbers from testing using the RSP2, the SAWBird GOES LNA, and the ANT-GRID-24DBI antenna:

1) Premiertek ANT-GRID-24DBI out of the box constructed as instructed by Premiertek operating at 1.69 GHz on GOES 16: Signal Quality 69.7 Viterbi Corrects 455
2) Premiertek ANT-GRID-24DBI with secondary reflector flipped over at 1.69GHz on GOES 16: Signal Quality 95.7 Viterbi Corrects 65
3) Premiertek ANT-GRID-24DBI with dipole modification for 1.69 GHz and optimized secondary reflector for 1.69 GHz: Signal Quality: 98.0 Viterbi Corrects 30

As mentioned, given that the greatest positive change for operation of the ANT-GRID-24DBI at 1.69 GHz was made simply by flipping over the secondary reflector as described in the post, other modifications were not described. This also makes setup easier and does not void the warranty on the antenna.

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rdale
Posts: 4
Joined: Thu Aug 09, 2018 6:31 pm

Re: HRIT and LRIT Low-Cost System

Postby rdale » Sun Aug 12, 2018 4:54 pm

Great info - thanks! I'm excited to start piecing this together... I'm one of the original EMWIN software developers from the 90s and while I'm completely satisfied with the Internet feed - going back to the "satellite" roots sounds fun.

- Rob
Last edited by rdale on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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RSP2user
Posts: 65
Joined: Mon Oct 09, 2017 7:11 am

Re: HRIT and LRIT Low-Cost System

Postby RSP2user » Sun Aug 12, 2018 6:04 pm

Rob,

If you are interested in compiling your own GOES demodulation and decoding software using free, readily available, tested modules, refer to work done by Lucas Teske and others on GitHub (Open Satellite Project): https://github.com/opensatelliteproject/xritdemod and https://www.teske.net.br/lucas/2017/04/ ... k-results/ . Lucas and others have tested their software using SDRs including the RSP1A and RSP2. If you are not interested in developing your own software, the solution from USA-Satcom is reasonable in cost.

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IZ5RZR
Posts: 1
Joined: Tue Aug 14, 2018 3:05 pm

Re: HRIT and LRIT Low-Cost System

Postby IZ5RZR » Tue Aug 14, 2018 3:08 pm

Hi, does anyone know how to get in touch with the XHRPT software authors to get a copy ?, the contact form of the USA_SATCOM website does not seem to work
Ciao, qualcuno sa come mettersi in contatto con gli autori del software XHRPT per averne una copia?, il contact form del sito USA_SATCOM sembra non funzionare,
Many thanks
IZ5RZR Massimiliano
Last edited by IZ5RZR on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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RSP2user
Posts: 65
Joined: Mon Oct 09, 2017 7:11 am

Re: HRIT and LRIT Low-Cost System

Postby RSP2user » Tue Aug 14, 2018 11:22 pm

Success in contacting USA-Satcom has been accomplished using the Chrome browser and with Gmail e-mail accounts. That being said, you can follow USA-Satcom on Twitter and then USA-Satcom can direct message you. USA-Satcom on Twitter: https://twitter.com/usa_satcom?ref_src= ... r%5Eauthor

Il successo nel contattare USA-Satcom è stato raggiunto utilizzando il browser Chrome e gli account di posta elettronica di Gmail. Detto questo, puoi seguire USA-Satcom su Twitter e poi USA-Satcom può contattarti. USA-Satcom su Twitter: https://twitter.com/usa_satcom?ref_src= ... r%5Eauthor

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