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A comment on Welcome to Nomehenge, Home to Alaska’s Soviet-Era Antennas. Parent comment

Re:Welcome to Nomehenge, Home to Alaska’s Soviet-Era Antennas by blantonl on Wednesday June 23, 2021 @11:40AM (#27605793)
A very active tropo scatter system still in use today is the SNOTEL network, which are snow level and precipitation sensors spread all throughout very remote and mountainous terrain in the Western US and Canada.

They operate on 40.67 MHz are still actively in operation today.

https://www.wcc.nrcs.usda.gov/snow/

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Re:Welcome to Nomehenge, Home to Alaska’s Soviet-Era Antennas by walrus01 on Wednesday June 23, 2021 @12:43PM (#27606567)
I imagine the information needed for small integer data from a sensor of rainfall mm/hour and snow gauge, etc is a very low data rate... What channel widths and modulations are they using in the 40MHz bands?
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Re:Welcome to Nomehenge, Home to Alaska’s Soviet-Era Antennas by blantonl on Wednesday June 23, 2021 @01:31PM (#27607314)
Snotel is a 9 khz channel bandwidth, BPSK data at 4000 bits per second
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