Comments - Key a Raspberry Pi - sine wave code practice oscillator - with your CW KEYER - just like a RIG - QRQcw2024-03-28T22:27:01Zhttp://qrqcwnet.ning.com/profiles/comment/feed?attachedTo=1993813%3ABlogPost%3A28622&xn_auth=noHere is a short demo showcasi…tag:qrqcwnet.ning.com,2017-01-02:1993813:Comment:288222017-01-02T18:48:28.412ZChuck aa0hwhttp://qrqcwnet.ning.com/profile/chase
<p style="text-align: center;">Here is a short demo showcasing a STRAIGHT KEY, IAMBIC PADDLES, and QRQ CW KEYBOARD</p>
<p style="text-align: center;"><iframe allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/l5BHSgx71nM?wmode=opaque" width="560"></iframe>
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<p>Part 2 of this video series, is a short demo showcasing a STRAIGHT KEY, iambic paddles and qrq cw keyboard - keying the RazPi by using the KEYING JACK OUTPUT on a K1EL K40 CW KEYER, - just like you…</p>
<p style="text-align: center;">Here is a short demo showcasing a STRAIGHT KEY, IAMBIC PADDLES, and QRQ CW KEYBOARD</p>
<p style="text-align: center;"><iframe width="560" height="315" src="https://www.youtube.com/embed/l5BHSgx71nM?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
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<p>Part 2 of this video series, is a short demo showcasing a STRAIGHT KEY, iambic paddles and qrq cw keyboard - keying the RazPi by using the KEYING JACK OUTPUT on a K1EL K40 CW KEYER, - just like you would hook up a CW KEYER to an HF RIG to key CW - this RAZpi however, uses a setup with a 555 CPO sidetone audio generator that is "keyed" by the K1EL K40. The K40 keying jack on its rear panel is connected to the input of a FET OPTOISOLATOR, so that when it is grounded by the K1EL cw rig keying signal, the FET OPTOISOLATOR "keys" in turn, a 555 timer chip with a square wave output at about 3khz...this 3khz audio tone output connects to the line input of a USB SOUNDCARD(usb soundcard=Behringer uca222) The software on the RazPi then takes this 3khz harsh square wave and converts it into a cloned keying signal for the software sine wave synthesizer code practice oscillator APP Reasynth.</p>
<p>The optoisolator / 555 RazPi keying circuit is similar to this one: <a href="http://i.imgur.com/C2qYIPm.png" target="_blank">http://i.imgur.com/C2qYIPm.png</a></p>