This transistorized circuit appeared in a Radio Electronics magazine in March 1958. The frequency range depends on the tuned circuit, being within a few megahertz.
Found in the September 1984 issue of Radio Electronics magazine, this circuit uses common...
Found in the July 1968 Supertena Bulletin of a Popular Electronics, this receiver makes use of the...
This intercom for the 27 MHz band was found in a recent English documentation, working with a...