This circuit is from Electronics Now magazine, February 1987. The number of channels is high depending only on the distances of the stations and the losses in the cables.
Originally this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
In the figure we have the way to excite an LED with one of the 4 operational ones available on the...
In this version from the 60s, the indicator is a light bulb, but the circuit can be modernized with the...