Marc Vaillant's Page

"Just a note on how the audio volume effects the Audio Derived CW keying circuits output to KEY the cw jack of a rig...too much volume into the switch,  your cw elements will be longer than the original,  too little volume into the switch,…"

"Measure the input and output impedance of your own setup using this online calculator http://www.sengpielaudio.com/calculator-InputOutputImpedance.htm Here are some results of the output impedance of some of my sound cards using this…"

"HERE IS A GOOD EXAMPLE OF KEYING A CODE PRACTICE OSCILLATOR USING THE FLDIGI QSK ON RT CHANNEL FEATURE This audio file demonstrates FLdigi's QSK FEATURE, on the RT CHANNEL, keying an old HEATHKIT CODE PRACTICE OSCILLATOR at about 75 wpm. The…"

"Here is a picture of FLdigi's audio derived keying voltage compared to the actual RF output of my rig.   FLdigi does a great job of producing the exact cw element lengths using its QSK FUNCTION for audio derived cw keying."

"Here is a picture of FLdigi's audio voltage(bottom) going into the switch compared to the actual key closure.  FLdigi's QSK function does a great job of keying the rigs cw jack and duplicating the exact cw element lengths as you can…"

"Here is an article about using the QSK ON RT CHANNEL feature of FLdigi to key a rig  in AFCW MODE.  Improve the QSK of any rig using AFCW and the FLdigi QSK ON RT CHANNEL method. I have used this method on my old ICOM 735 and it was…"

"Just using Joe's advice to increase the GRAPHIC EQUALIZER's midrange frequencies all the way.. I did a measurement with my AMPROBE METER, of the "native" RMS AUDIO VOLTAGE  coming out of the sound card (with no load)  -…"

"Excellent, Joe !  Great idea ... Here is a picture of Joe's AUDIO MANAGER Here is a picture of my REALTEK HD AUDIO MANAGER's EQUALIZER Just go to your control panel to find your AUDIO MANAGER for your computer Here are a couple of…"