Marc Vaillant's Page

"Here is a LIVE DEMO of an Audio Derived CW Keying Switch Circuit KEYING a RIG's CW JACK SEUTP: in this demo, FLdigi is sending out a CW KEYING TONE at 1Khz using FLdigi's RT QSK feature/function the input of the SWITCH rectifies and…"

"Here is another example of an audio derived CW KEYING CIRCUIT, this time using a diode switch to key the RIG's CW JACK brief testing of FULL QSK keying of an ELECRAFT K3S at 65 wpm using FLdigi on a Raspberry pi 4, sending 2400hz CW AUDIO out…"

"Here is another example of keying an ELECRAFT K3S RIG - by an audio derived CW KEYING circuit - using a software CW KEYBOARD(YPLog in this example) and a Raspberry PI 4 headphone output jack the Raspberry PI tested to have enough volume output at…"

" Here is another interesting low cost circuit that might work well for an audio derived CW RIG Keying circuit: FROM:  https://web.eecs.umich.edu/~prabal/pubs/papers/kuo10hijack-islped.pdf"

"Here is a LIVE DEMO of using the full wave doubler circuit with a MOUSER 8 ohm to 200 ohm input transformer - this is a REMOTE CW setup, where a Low Power AM transmitter(1630 Khz) is modulated at the remote OP's desktop by the audio output of a…"

"Here is a video demo of testing these kind of circuits to key CW on a RIG to find the "best" audio pitch AUDIO DERIVED CW KEYING CIRCUIT - (what audio frequency to use) Finding the "best" audio pitch to generate the most…"