sbr: RPF; Radio-Puzzle

Morse code pulsating tones enter the RPF (AMP), are rectified and result in a pulsating DC voltage (Writer).

This output signal may drive a relay with a pen for writing down the morse code or a relay with a morse key to convey the code (repeater key).

The power to the relay following the RPF module is provided by the preceding LF amplifier (RPE module).

Module RPF does not need a DC anode voltage supply. With the grids attached to the anodes, the tubes act as diodes and rectify the signal delivered to the anodes.

See schematic with waveform example below.

 

 

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