[Elecraft] KX-1 - cleaning up the square wave sidetone?

[Chester Alderman]

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-bounces at mailman.qth.net] On Behalf Of J
Sent: Thursday, March 12, 2015 4:09 PM
To: 'Phil Wheeler'; elecraft at 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-bounces at mailman.qth.net] On Behalf Of Phil
Wheeler
Sent: Thursday, March 12, 2015 10:56
To: elecraft at 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

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