What is the Hz of the 1960s 23 channel CB radios?

I sold my old CB radios today on CL, $40 for both transceivers, with mics & several antennas. I'm not sure that was a good price but don't need them anymore. I got A+ in electronic class project 1969 used CB radio for mobile telephone I could make phone calls from my car. I tested the CBs last week to make sure they still work and they work good. Guy that bought them is actually going to use them. I told him it might be illegal he said, there mine now. That makes me wonder, I think they were 27 MHz but not sure. I wonder what those CB radios will interfere with these days?

In the UK they were 27MHz and so were R/C systems. Not sure what uses that frequency anymore.

Mike.

https://en.wikipedia.org/wiki/Citizens_band_radio
Still legal.

Ken

Frequencies for the 40 CB radio channels in the U.S. can be found at the link below:
(click the "Data" tab on the page for the list)

https://www.fcc.gov/wireless/bureau-divisions/mobility-division/citizens-band-radio-service-cbrs

My RC model airplanes and helicopters use 2.4GHz so they don't crash each time a CB'r hollers "Breaker" on his CB radio.
I think the 2.4GHz uses spread spectrum technology and automatically selects vacant frequencies so the model transmitters do not interfere with each other.

If something epitomizes the 1970s consumer electronics craze, it is CB radios....boy, those were the days.

I popped high school 1970, CBs were like stupid on steroids.
Everybody had a unit and a "handle".
Might as well handed 5 year olds grenades.

My brother built a couple "linear" amps.
Problem was his background was mechanical -- NO RF concepts at All.
When he keyed the 500W unit (feeding a "dual quad" on a 70 ft tower), All the TVs, FM & AM radios within ~1/2 mile radius just went Nuts.
I think cell phones superseded them, but I'm not sure it's a net positive.
Never saw a CB user trip on a curb or fall into a fountain... But I AM my title... <<<)))

PS, for audioguru: I 'mem Big signs "NO CBs" in construction zones and RC gatherings...