Back in the 80s, I built a couple of RST radios from kits. Light, dependable, decent range. But crystal controlled. I bought 123.3 and 123.5 with the kit. I wanted to add a frequency later so I had to buy another crystal (two, IIRC, for transmit and receive?). There were 10 slots but I didn't fill them all up. This was back when an aviation set had 360 frequencies.

Technology marches on.

Chip Bearden