[Elecraft] KX-1 - cleaning up the squarewave sidetone?

[Rick Dettinger]

I have used an outboard audio filter to "clean up" square wave sidetones, like on my K1.
Worked well.
I remember when the modes came out to do this to the K2 sidetone.
However, listen to an old spark audio file.  After that, everything sounds good.  Spark sounds like what you might expect a 5KW damped arc to sound like in a receiver.
 
73,
Rick Dettinger  K7MW




On Mar 12, 2015, at 1:08 PM, J wrote:

> 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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