This circuit is from the Motorola Linear Databook of 1990. The coils must be according to the frequency of the signal.
With this converter it is possible to receive signals from the 220 MHz band on a 144 MHz receiver....
Published in the September 1973 issue of Radio Electronics magazine, this diagram may be useful to...
Found in American documentation from the 90s, this circuit keeps the high beam on for a time...