This signal amplifier for ATV in the 427 to 439 MHz band was found in a magazine 73 for radio amateurs of the 90's. The circuit is installed next to the antenna on the mast itself.
We found this circuit in a 1990 documentation. It is totally up to date by the components it uses...
This inverter was found in an old European documentation, but components are still current. Only...
This circuit is from a 1966 American documentation. The circuit uses a photo-FET, an unusual...