Just feed the square wave through an audio filter will take out most of the harmonics and you will get a pretty decent sine wave tone.
73, Tom - W4BQF -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of J Sent: Thursday, March 12, 2015 4:09 PM To: 'Phil Wheeler'; elecraft@mailman.qth.net Subject: Re: [Elecraft] KX-1 - cleaning up the squarewave sidetone? Thanks Phil & list- I may get a scope and have a look at the waveform of the ST. 73 Jay W6CJ -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil Wheeler Sent: Thursday, March 12, 2015 10:56 To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KX-1 - cleaning up the squarewave sidetone? Hmm .. I've never noticed that problem, J. I'll go listen again later today. Phil W7OX On 3/12/15 10:05 AM, J wrote: > I did not want to reinvent the wheel, and hoped some mods existed to > clean up the KX-1 sidetone. > > At times, I find it difficult to zero in on a station's 600-hz with my > "600 hz" squarewave. > > Has someone come up with a mod? > > > > I'm thinking that plenty of audio is available at the sidetone level > setting (STL), so it might be possible to make an RC filter. > > > > It looks like the sidetone enters AF amp via a 1M resistor, R15, to > IN1 and > IN2 > > > > Thanks ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to tsc...@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to alderm...@windstream.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
