[Elecraft] Sidetone with harmonics at 400 Hz...

[Rob Locher W7GH]

Hi Ken,

Thanks for the email.  I've compared the sidetone from my K2 to the
sidetone from several others, and mine is about typical.  I don't doubt
that my tone would look sinusoidal on a scope, since the harmonics are
probably several dB down from the fundamental tone.  However, they are
there, they can be seen on Spectrogram, and they are annoying (to me at
least, but not to Ron AC7AC).  I also have a problem zero-beating with the
stock tone, like Steve N6VL.

The bottom line is that the audio from the SCAF-1 is much nicer, and I
think that many other K2 users would think so also.

73!
- Rob W7GH




On Sat, 04 Aug 2007 11:47:25 -0700, Ken K3IU <kenk3iu at cox.net> wrote:

> Ho Rob:
> If you are getting a square wave out of your sidetone, then you probably  
> have a problem someplace. I just put the sidetone from 5413 on the scope  
> and is shows an almost perfect sine wave.
> 73,
> Ken Wagner K3IU
>
> Rob Locher W7GH wrote:
>> I find the square wave character of the stock sidetone quite annoying on
>> my K2 #5004, with the sidetone set at 500 Hz.  However I run the audio
>> through a SCAF-1 external audio filter, which makes the sidetone much  
>> more
>> of a single tone, and far more pleasant to my ear.  The SCAF-1 also
>> eliminates the high-frequency hiss in my headphones.  The hiss didn't  
>> seem
>> like a big deal, until I could make it go away; then I realized how much
>> it had been bugging me.
>>
>> More information on the SCAF-1 is available here:
>> http://www.idiompress.com/scaf-1.html
>>
>> The Standard Disclaimer does not apply...
>>
>> 73,
>> - Rob W7GH
>>
>>
>>
>>
>> On Sat, 04 Aug 2007 10:25:07 -0700, Steve Kallal <n6vl at yahoo.com> wrote:
>>
>>> I have a K2, serial #2289, that has a second harmonic in the sidetone.  
>>> The
>>> sidetone is set for 400 Hz because I do much better with lower  
>>> pitches. The
>>> sidetone at 400 Hz has a definite square wave sound to it. The problem
>>> certainly is not present at 600 Hz, and I don't even want to try 500  
>>> Hz. I'd
>>> go lower than 400 Hz if the K2 allowed it.
>>
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>
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