Re: transmitting CW with Raduino Bitx40?
|
I mentioned FLDigi earlier because our ham radio club will be building the Easy Digi board kits as a club project at next month's meeting. If I am already set up for digital modes, seems like that would be an easy way to go about it.
Rich KC8MWG
On Thursday, January 19, 2017 10:02 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
The Raduino could use a counter-timer to approximate a properly shaped audio sine wave using pulse-width-modulation, RC filtered before injecting into the mic input. Easier and possibly cleaner would be to inject DC via a diode into the top of C107 to unbalance the modulator during a dot or dash, have the Si5351 driven BFO centered on the crystal filter passband during CW transmissions. ?That DC can come from a Raduino digital output, goes through an RC filter to avoiding key clicks. Shut down the mic amp when operating CW, or maybe just unplug the mic. ? Disclaimer: I've never done any of this.
Jerry, KE7ER
|
