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Updated NOAA (markdown)

Brumi-2021
2025-05-11 10:54:10 +02:00
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NOAA.md

@@ -4,10 +4,9 @@ Currently, they are using those frequencies, (but in future it may change, you n
![image](https://github.com/user-attachments/assets/85e9e32f-7c69-44a6-aaeb-5695161beeca) ![image](https://github.com/user-attachments/assets/85e9e32f-7c69-44a6-aaeb-5695161beeca)
NOAA Polar Operational Environmental Satellites (POES) have an orbital period of approximately 102 minutes, approximately 520 miles (800 kms) above Earth, meaning they circle the Earth in about that time.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. This allows them to complete about 14 orbits per day, passing over the same location twice daily, once during daylight and once at night.
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 aprox. 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 The analogue APT weather map transmission was invented in the 60's