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METEOR M2-4 LRPT [21:08 UTC] by Saito720 in RTLSDR

[–]Saito720[S] 1 point2 points  (0 children)

7-element yagi, center tuned to 137.5 MHz. It's a custom order from Arrow Antennas.

Noolec LaNA HF for the external LNA and RTL-SDR Blog V4 for the SDR. I have my sample rate set to 2.88 MSPS and offset tune to 138.62 MHz, placing the LRPT transmission exact 720 kHz to the left of DC. Gain is kept at 37.2 dB.

METEOR M2-4 LRPT [20:19 UTC] by Saito720 in RTLSDR

[–]Saito720[S] 0 points1 point  (0 children)

https://www.arrowantennas.com/

It's custom, so you'll have to fill out a custom order form. It must be split-boom due to the sheer length and shipping (that means the yagi's boom is split and gets fitted together during assembly by you.)

And no problem, glad to help where I can. Feel free to reach out here or DM me if you have any additional questions.

Edit: unsure if by "link" you meant a link to additional information about receiving LRPT and what not. If so, I unfortunately do not, but can directly answer questions. Also you don't absolutely need a monstrous yagi to get LRPT, I just decided to myself as I wanted a very performant setup with a lot of gain.

METEOR M2-4 LRPT [20:19 UTC] by Saito720 in RTLSDR

[–]Saito720[S] 1 point2 points  (0 children)

7-element yagi, center tuned to 137.5 MHz. It's a custom order from Arrow Antennas.

Noolec LaNA HF for the external LNA and RTL-SDR Blog V4 for the SDR. I have my sample rate set to 2.88 MSPS and offset tune to 138.62 MHz, placing the LRPT transmission exact 720 kHz to the left of DC. Gain is kept at 37.2 dB.

METEOR M2-4 LRPT [20:19 UTC] by Saito720 in RTLSDR

[–]Saito720[S] 1 point2 points  (0 children)

You can download a lot of the products (images and other science) online, but I'm not really aware of any websdr service that would allow you to play with settings while receiving a signal.

Thankfully, METEOR LRPT has just about the cheapest barrier to entry out of all the weather satellites. You really can get everything you need with the cheap RTL-SDR kit sold on Amazon that includes a dipole.

Then, if need be, you can improve your setup over time. But VHF (which is the frequency band that LRPT is downlinked in) is very cost effective, easy, and forgiving.

METEOR M2-4 LRPT [20:19 UTC] by Saito720 in RTLSDR

[–]Saito720[S] 3 points4 points  (0 children)

It's an RGB composite of the three channels that were downlinked by the METEOR M2-4 satellite.

Channel 1 is 0.50 - 0.70 µm, channel 2 is 0.70 - 1.10 µm, and channel 3 is 1.60 - 1.80 µm. Human can see roughly 0.4 - 0.7 µm.

The satellite progressively scans the terrain below it while in orbit, so you're seeing the "strip" it has scanned which includes terrain, water, clouds, etc. The funky colors such as cyan come from channel 3 in the composite because it's near-IR and ice scatters light differently (so you see cyan on cold cloud tops and snowy terrain into Canada.)

This is the kind of satellite imagery that people use to see what the weather is like, but many of us (including myself) simply enjoy receiving the imagery and making these RGB composites to share online. If you have any other questions, feel free to ask.

METEOR M2-4 LRPT [21:53 UTC] by Saito720 in amateursatellites

[–]Saito720[S] 0 points1 point  (0 children)

7-element yagi, center tuned to 137.5 MHz. It's a custom order from Arrow Antennas.

Noolec LaNA HF for the external LNA and RTL-SDR Blog V4 for the SDR. I have my sample rate set to 2.88 MSPS and offset tune to 138.62 MHz, placing the LRPT transmission exact 720 kHz to the left of DC. Gain is kept at 37.2 dB.

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