[Elecraft] K2 SSB TX audio question

Don Wilhelm w3fpr at embarqmail.com
Mon Aug 12 22:21:40 EDT 2013


It reduces the low frequency energy getting to the speech compressor on 
the KSB2 board.

73,
Don W3FPR

On 8/12/2013 9:59 PM, Gerald Manthey wrote:
> Don
> Changing those two caps changes the audio or band width of the signal?
> Thanks
> Gerald.
> On Aug 12, 2013 6:41 PM, "Don Wilhelm" <w3fpr at embarqmail.com> wrote:
>
>> Ed,
>>
>> Change 2 capacitors on the KSB2 board.  C34 to 0.47 uF and C32 to
>> something in the 3300 pF to 5000 pF range.
>>
>> I usually run SSBC at 3-1 and SSBA at 1 with the Elecraft MH2 microphone
>> and it sounds good with those changes made.
>>
>> 73,
>> Don W3FPR
>>
>> On 8/12/2013 6:18 PM, Eddy wrote:
>>
>>> K2 serial number 3600+ using the Heil hand mic that Elecraft sells, also
>>> did the KI6WX wide-band mod years ago. When on LSB using the elecraft
>>> recommended settings of SSBA of 2-1 and SSBC of 2-1, I get lousy reports
>>> that there's too much base in my audio and hams find it hard to hear what
>>> I'm saying, but when I turn off compression I then get really good audio
>>> reports!
>>>
>>>
>>> So, for the K2 wizards out there, as long as I leave the compressor off,
>>> my hams friends are happy.......so, I'm wondering why turning on
>>> compression increases the base response and if there's a way to improve
>>> audio when using SSBC 2-1? I've used Spectrogram to slightly adjust audio
>>> filter bandpass but doesn't do much.
>>>
>>> As always, thanks for everyone's help!
>>>
>>> 73......ed
>>>
>>> k6sdw
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