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KX-1 - cleaning up the squarewave sidetone?

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KX-1 - cleaning up the squarewave sidetone?

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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Phil Wheeler-2

Re: 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

Re: 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:[hidden email]] On Behalf Of Phil
Wheeler
Sent: Thursday, March 12, 2015 10:56
To: [hidden email]
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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Rick Dettinger-3

Re: KX-1 - cleaning up the squarewave sidetone?

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:[hidden email]] On Behalf Of Phil
> Wheeler
> Sent: Thursday, March 12, 2015 10:56
> To: [hidden email]
> 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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>
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> Please help support this email list: http://www.qsl.net/donate.html Message
> delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
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>
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Phil Wheeler-2

Re: KX-1 - cleaning up the squarewave sidetone?

Wayne will be happy that the KX1 sounds better
than a rotary spark gap :-)

73, Phil W7OX

On 3/12/15 1:21 PM, Rick Dettinger wrote:
> 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

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