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Updated NOAA (markdown)

Brumi-2021
2025-05-10 17:52:01 +02:00
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NOAA.md

@@ -8,7 +8,7 @@ Currently, they are using those frequencies, (but in future it may change, you n
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 .The satellite is broadcasting it with a radiated power of 5W at 800 kms, so we may need QFH 137 Mhz antenna band or proper dipole + bandpass amplifier.
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 .The satellite is broadcasting it with a radiated power of 5W aprox. at 800 kms, so we may need QFH 137 Mhz antenna band or proper dipole + bandpass amplifier.
The analogue APT weather map transmission was invented in the 60's
![image](https://github.com/user-attachments/assets/433e3db3-e541-42e4-bd0f-57ed64aed841)