vhfwxsatellitetips
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vhfwxsatellitetips [2021/08/01 23:40] – mm3iig | vhfwxsatellitetips [2022/05/08 01:39] (current) – [OARC VHF Weather Satellite Reception Tips & Tricks] mm3iig | ||
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+ | //Meteor-M2 LRPT capture of the Eastern Atlantic and the U.K. & Ireland - MM3IIG// | ||
- | This is the first draft of what will hopefully become a useful club resource for people wanting to do some VHF satellite reception of either NOAA APT signals or the LRPT signal from the Russian meteor satellites. There’s no need to reinvent the wheel as plenty has been written before on this subject. Instead there will be links to other places around the Internet, but also some learned wisdom and tips from OARC members. | + | This is the home of what will hopefully become a useful club resource for people wanting to do some VHF satellite reception of either NOAA APT signals or the LRPT signal from the Russian meteor satellites. There’s no need to reinvent the wheel as plenty has been written before on this subject. Instead there will be links to other places around the Internet, but also some learned wisdom and tips from OARC members. |
- | VHF satellite work is the easiest satellite reception work to get into. If you get the bug after doing this consider moving up to L-band HRPT reception, which should doable with a modest antenna. The next step up from that is to geostationary satellites, where you'll be needing amplifiers, filters, and a whole lot of kit. There are a few places on the internet that specialise in this kind of thing. | + | VHF satellite work is the easiest satellite reception work to get into. If you get the bug after doing this consider moving up to L-band HRPT reception, which should doable with a modest antenna. The next step up from that is to geostationary satellites, where you'll be needing |
+ | |||
+ | To-do: Finish the antenna section (plus links!), maybe a bit more about radio choice, and any other suggestions that you guys want. | ||
+ | |||
+ | Mark MM3IIG | ||
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===== Contents ===== | ===== Contents ===== | ||
- | * [[vhfwxsatellitetips-antenna|Antenna considerations + links to projects]] | + | * [[vhfwxsatellitetips-antenna|Antenna considerations + links to projects]] |
- | * [[vhfwxsatellitetips-hw|Extra Hardware]] | + | * [[vhfwxsatellitetips-hw|Hardware |
- | * [[vhfsatellite-sw|Software overview + tips]] | + | * [[vhfsatellite-sw|Software overview + tips]] |
- | + | * [[vhfsatellite-general|General tips/data for APT and LRPT decoding]] - some discussion on the signals | |
- | ====== General | + | * [[vhfsatellite-gallery|OARC reception gallery]] |
- | + | ||
- | <WRAP left round info 25%> | + | |
- | ===== Frequency list ===== | + | |
- | * **NOAA-15:** 137.6200 | + | |
- | * **NOAA-18: | + | |
- | * **NOAA-19: | + | |
- | * **Meteor M-N2:** 137.1000 | + | |
- | </WRAP> | + | |
- | + | ||
- | Obviously | + | |
- | + | ||
- | **APT:** FM, 34 kHz signal, set filter bandwidth to around 35-40 kHz. If you’re correcting for Doppler you can maybe go towards the lower of the range to block out more of what you don't need, but if not go for 40 to get the whole thing in and account for the +/- Doppler difference, approximately 3 kHz. | + | |
- | + | ||
- | **LRPT:** FM, 120 kHz signal, set filter bandwidth to around 130-140 kHz. Doppler correction isn’t strictly needed as the demodulator tools can pick out the data and lock onto it just fine. An SNR of around 10 dB will decode fine, but you may even get some data coming through | + | |
- | + | ||
- | For LRPT work remember that it’s | + | |
- | + | ||
- | + | ||
- | <WRAP center round important 60%> | + | |
- | If you’re switching between receiving the two types of signal don’t forget to check your Doppler/ | + | |
- | </ | + | |
- | + | ||
- | If you can avoid DC spikes by using offset tuning or a filter function it can help, particularly with LRPT. If it’s baked into your recording and you're using SatDump then there’s an option to block it as the file is read. | + | |
- | + | ||
- | You'll need more gain for LRPT signals because of the similar power but lower bandwidth (power density). This can induce intermod/ | + | |
- | + | ||
- | ===== Audio Samples ===== | + | |
- | + | ||
- | Here's a couple of audio samples to test your software setup with. There' | + | |
- | + | ||
- | <WRAP left round info 40%> | + | |
- | ==== APT Sample ==== | + | |
- | 11,025 kHz mono WAV file, (size here) | + | |
- | (link here) | + | |
- | </ | + | |
- | + | ||
- | <WRAP right round info 40%> | + | |
- | ==== LRPT Sample ==== | + | |
- | 250 kHz wide baseband I/Q WAV file, (size here) | + | |
- | (link here) | + | |
- | </ | + | |
---- | ---- | ||
- | ====== OARC reception gallery ====== | + | ===== Community Links/ |
- | + | ||
- | If you're adding entries please add the start time of the pass, or for composites feel free to specify a time range. | + | |
- | + | ||
- | ===== APT Captures ===== | + | |
- | ^ Capture | + | There’s lots of places where you can find some more information on reception, software, antennas, and all other relevant topics: |
- | ^ [[https:// | + | |
- | ^ [[https:// | + | |
- | ^ [[https:// | + | |
- | ^ [[https:// | + | |
- | ===== LRPT Captures ===== | + | **Reddit:** https:// |
- | To follow. | + | **LibreSpace: |
- | ^ Capture | + | **Twitter: |
- | ^ [[x|{{x}}]] | + |
vhfwxsatellitetips.txt · Last modified: 2022/05/08 01:39 by mm3iig