HRIT and LRIT Low-Cost System

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RSP2user
Posts: 71
Joined: Mon Oct 09, 2017 7:11 am

Re: HRIT and LRIT Low-Cost System

Postby RSP2user » Thu Sep 06, 2018 3:40 am

It appears that supply vs demand (or possibly a new tariff) has increased the price on all major components originally listed in this article, since it was first posted. Perhaps as others find new low-cost solutions, these will be posted here. If you come across alternative viable antenna solutions, feel free to let others know. By the way, the Loop Yagi antenna in the following article can be built fairly inexpensively, if one is willing to put in several hours of construction time and has adequate skills to build it: viewtopic.php?f=5&t=2674
Unfortunately, the once readily available at low cost (< $60) telescope mounts used for alt-az antenna control in the article have become a lot harder to find and when these become available are hard to get for less than $120. However, if you do not need to reposition the antenna, such as for GOES 15, 16, 17 LRIT/HRIT reception repositioning or for orbital satellite HRPT use, then the Loop Yagi antenna described in the article will work well as a fixed antenna and if built well has better performance than the ANT-GRID-24DBI antenna at 1.69 GHz.

An additional note: The latest version of the Nooelec SAWbird GOES LNA is not the same as the original engineering prototype version applied in this article. The new version of Nooelec SAWbird GOES LNA likely has better performance, but its current draw is 180 mA, which is greater than can be supported on the BIAS T from the RSP2, so it will require an additional power source if used with the RSP2.

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rdale
Posts: 11
Joined: Thu Aug 09, 2018 6:31 pm

Re: HRIT and LRIT Low-Cost System

Postby rdale » Thu Sep 06, 2018 12:46 pm

Building from scratch might exceed by patience and skill level :) Shopblt.com says they will be in stock within two weeks and are < $50 so I jumped on that. Thanks for your advice.

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rdale
Posts: 11
Joined: Thu Aug 09, 2018 6:31 pm

Re: HRIT and LRIT Low-Cost System

Postby rdale » Wed Sep 12, 2018 6:22 pm

The antenna is back in stock from Provantage as the cheapest spot. Of course I didn't want to risk it :) But that means mine is coming in today.

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RSP2user
Posts: 71
Joined: Mon Oct 09, 2017 7:11 am

Re: HRIT and LRIT Low-Cost System

Postby RSP2user » Thu Sep 13, 2018 1:33 pm

Hurricane Florence full disk and mesoscale images received from GOES 16 this morning:

GOES 16 FD and Mesoscale - Hurricane Florence September 2018 - 2.jpg
GOES 16 FD and Mesoscale - Hurricane Florence September 2018 - 2.jpg (155.9 KiB) Viewed 880 times

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

Re: HRIT and LRIT Low-Cost System

Postby rdale » Fri Sep 14, 2018 12:47 pm


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rdale
Posts: 11
Joined: Thu Aug 09, 2018 6:31 pm

Re: HRIT and LRIT Low-Cost System

Postby rdale » Tue Sep 18, 2018 3:11 pm

RSP2user wrote: In the United States for GOES 16, the polarity that works best is a diagonal polarity from bottom right to upper left when facing the satellite.


Can you clarify this? I'm behind the antenna looking south through the mesh, so I put the right side lower and the left side goes up. But in your pictures it appears to be the other way?

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RSP2user
Posts: 71
Joined: Mon Oct 09, 2017 7:11 am

Re: HRIT and LRIT Low-Cost System

Postby RSP2user » Wed Sep 19, 2018 12:04 am

Rob,

The "right side being lower" is referring to the position of the feed element, not the primary reflector. The polarization angle should look like this for GOES 16. To determine the location to point the antenna, you can use the following site to locate GOES 16 at 75.2W: http://www.dishpointer.com/

IMG_3271FA v2.JPG
IMG_3271FA v2.JPG (40.81 KiB) Viewed 237 times


Once you have the antenna positioned, and the LNA hooked up and properly powered you can use SDRuno and the RSP to verify you are receiving the GOES 16 HRIT signal on 1.6941 GHz. Use 4 MSPS sampling rate for SDRuno. You should see the following signal:

Initial Test - NooElec SAWBird GOES using SDRuno on G16.JPG
Initial Test - NooElec SAWBird GOES using SDRuno on G16.JPG (118.7 KiB) Viewed 235 times

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

Re: HRIT and LRIT Low-Cost System

Postby rdale » Wed Sep 19, 2018 12:40 pm

Got it. I finally noticed that we were behind the antenna in that picture. Everything is assembled and the software ready, but I ordered one wrong connector so anxiously awaiting Amazon tomorrow to finish this!

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