CLAIN and 1420
What is the "frequency of silence"?
It is what Bairo Leandro Gonzalez Martinez calls the 1400 to 1427 MHz band, where the ITU prohibits all emissions to protect radio astronomy.
"Frequency of silence" is the name Bairo Leandro Gonzalez Martinez gives to the radio band around 1420 MHz, the hydrogen line. By international agreement, all emissions are prohibited in the 1400 to 1427 MHz band, so that radio telescopes can listen to the universe without interference. It is that silence that gives the symbol its meaning.
Why this band stays silent
The Radio Regulations of the International Telecommunication Union (ITU), in footnote 5.340, prohibit all emissions between 1400 and 1427 MHz. The band is reserved for passive services, such as radio astronomy and Earth observation by satellite. In Brazil, Anatel follows the same allocation, and transmitting without authorization is a crime under the General Telecommunications Law.
It is rare to see so many countries agree not to use something. In this case, they agreed so that science could listen.
A symbol, not a device
None of Bairo's projects transmits on this band, and none intends to. 1420 is a symbolic milestone, never a transmission. For him, the frequency of silence stands for an attitude: listen before you build.
He links this silence to his own inner search, in the season when, after losing everything, he found faith and decided to start over. It is a personal reading, and that is how it should be understood: an image of connection and listening, grounded in a real scientific fact, with no claim to be science.