K2 Receive Audio

[wes Bolin]

I have a very nice K2 that I bought as previously owned.  It works fine on
SSB on
20 Meters.  The audio from the radio's speaker is low frequency for voice.
Sounds good on CW to me, but the SSB tone/pitch is like there is a LP
filter cutting off the
high frequencies.  When I have this situation with other
receivers/transceivers I find I can shift the BFO or Carrier Oscillator on
the filter slope and get audio that I like.
I also changed capacitor values in the audio stages too.  With the K2
I've tried other speakers and not found the sound that I like.  I am also a
little intimidated about any changes around the filter in the K2, since I
don't have the
spectrum displays that are recommended for exact adjustment.  Does anyone
have an idea how to get the higher audio frequencies out of the speaker?  It
will sure help me dig weak ones out of the noise.
Wes K5APL
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[Don Wilhelm]

Wes,

The most common cause is that the SSB IF filters are not aligned
correctly.  Use Spectrogram for a visual indication of the filter
passband.  See
http://www.mmccs.com/mmarc/n0ss/k2_filters_using_gram_v5r17.pdf.  You
will not be disappointed.

If you need Spectrogram, go to my website www.w3fpr.com and scroll down
on the home page to near the bottom.  You will find links to both
version 5.17 and version 16.

73,
Don W3FPR

On 6/10/2019 7:52 PM, wes Bolin wrote:

> I have a very nice K2 that I bought as previously owned.  It works fine on
> SSB on
> 20 Meters.  The audio from the radio's speaker is low frequency for voice.
> Sounds good on CW to me, but the SSB tone/pitch is like there is a LP
> filter cutting off the
> high frequencies.  When I have this situation with other
> receivers/transceivers I find I can shift the BFO or Carrier Oscillator on
> the filter slope and get audio that I like.
> I also changed capacitor values in the audio stages too.  With the K2
> I've tried other speakers and not found the sound that I like.  I am also a
> little intimidated about any changes around the filter in the K2, since I
> don't have the
> spectrum displays that are recommended for exact adjustment.  Does anyone
> have an idea how to get the higher audio frequencies out of the speaker?  It
> will sure help me dig weak ones out of the noise.
> Wes K5APL
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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