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Updated NOAA (markdown)

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2025-05-10 17:25:52 +02:00
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NOAA.md

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# Introduction
That Rx NOAA App, allows us to receive any of the 3 current operating NOAA weather satellites that are transmitting analogue [APT](https://en.wikipedia.org/wiki/Automatic_picture_transmission) maps in the 137 MHz band . NOAA are a Polar Operational Environmental Satellites (POES) satellite system, makes 14 nearly polar orbits per day approximately 520 miles (800 kms) above Earth. The Earth's rotation allows the satellite to see a different view with each orbit, and each satellite provides two complete views of weather around the world each day.
That Rx NOAA App, allows us to receive any of the 3 current operating NOAA weather satellites that are transmitting analogue [APT](https://en.wikipedia.org/wiki/Automatic_picture_transmission) maps in the 137 MHz band .
Currently, they are using those frequencies, (but in future it may change, you need to check it )
![image](https://github.com/user-attachments/assets/85e9e32f-7c69-44a6-aaeb-5695161beeca)
NOAA are a Polar Operational Environmental Satellites (POES) satellite system, makes 14 nearly polar orbits per day approximately 520 miles (800 kms) above Earth. The Earth's rotation allows the satellite to see a different view with each orbit, and each satellite provides two complete views of weather around the world each day.
The [APT signal](https://www.sigidwiki.com/wiki/Automatic_Picture_Transmission_%28APT%29#Frequencies) is modulated in a AM subarrier of 2400 Hz , and then all this audio map information is broadcasted in FM in the 137 MHz band .