For the 400 to 500 MHz bands, this circuitry found in an 80's documentation uses a very critical mounting configuration.
This circuit from March 1984 Radio Electronics is intended to allow the use of an oscilloscope to measure...
This transmitter uses a 741 operational amplifier in modulation. The microphone can be any type...
We found this circuit in a Radio Electronics issue from July 1969. The lamp remains on until C1...