Pi4 40Khz CW Transmitter output to HEADHONE JACK: to diode/transformer frequency doubler/amp/antenna

brief demo of using a simple DIODE/TRANSFORMER frequency doubler to get 40Khz CW out of a pi4 headphone jack, by sending to the diode doubler input, 20Khz from the pi's headphone jack

Pi4 HEADPHONE PHONE to diode/transformer/frequency doubler to class D amp input, CLASS D OUTPUT to a series resonant cap to a FERRITE ROD TRANSMIT ANTENNA....

receiver = sound card sdr's MIC INPUT JACK from its own FERRITE ROD RX ANTENNA to HILBERT CELL, to FILT MODULE, to LO-MIXER module all from: RECRI KEYER : https://github.com/recri/keyer

Comment by Chuck aa0hw on August 6, 2023 at 5:29am: 2200 Meter qrp CW Transmitter using a sound card/diode frequency doubler/audio amp & Ferrite antenna

sound card sample rate=192Khz

CW Keyer software set to send CW to sound card line output @68Khz line output goes to diode FREQ/doubler, to audio amp, to ferrite antenna

pi2b remote rig interface for RIG audio and RIG control at recording laptop

Pi4 40Khz CW Transmitter output to HEADHONE JACK: to diode/transformer frequency doubler/amp/antenna

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