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FCC considers crackdown on bad wireless receivers after 5G/altimeter debacle
The Federal Communications Commission will consider issuing new rules for wireless receivers that could prevent future conflicts like the ongoing battle between the aviation and cellular industries. There are strict rules requiring wireless devices to transmit only in their licensed frequencies. That means, for example, that AT&T and Verizon's 5G transmissions in C-band spectrum (3.7 to 3.98 GHz) have to stay within the C-band. But there isn't much to prevent devices from receiving… (arstechnica.com) और अधिक...
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This is probably the clearest and best represented article on what is going on w/ 5G and radar altimeters. As an electronics engineer, this article discusses a problem that has existed for decades. As the altimeters are pointed down to the earth, where there are a very limited number of C band transmitters, there was really, and in all sense, a finance reason, to engineer a very tight input rejection filter as the majority of the rF of C band was indeed coming from geosynchronous orbit and 180 degrees away from the radar altimeter antennas.
I remember a time when the FCC was an enforcement agency that monitored radio transmissions and issued citations for out of band or over modulation. My job required me to be FCC licensed in order to work on the FCC licensed transmitters that our company used in their business. Not so much any more.
I remember when operating a CB radio required a license from the FCC. I also remember a whole lot of CB radio users were unlicensed. In fact, I think most were unlicensed.
Most of us were why bother to do so they didnt care at the time. They only cared if there was a specific problem somewhere. Talked face to face with one back then he said hell we dont care but its funny listing to the CB talk when we are in town about us.
Nowadays GMRS (General Mobile Radio Service) is the service that everyone uses without realizing they're supposed to have a license (and the radio vendors are happy to let that misconception persist)
Yes, early 1970's I was a licensed CB'er (KER7349), required to keep a log, 5 minutes on, 5 minutes off... Then the song and movie Convoy came out in 1978, and millions of unlicensed users clogged the airways. On good skip nights you could talk hundreds of miles away, but now you couldn't talk a mile. And as ThinkingGuy posted, it is starting on the GMRS Service (WRNB399) too. :-(
Hasnt been that many years ago when it was hard to have a very narrow band trans or receive. Today thats a different matter due to all the new tech that has come down the line. Now to replace all the old receivers in aircraft takes lots of money to do so.
