[Elecraft] Lousy Tx audio reports using K2

[k6sdw]

Good stuff Don!

I'm concerning doing the G3RXQ mod to the KSB2 and see if that helps with
the low-freq response.

73.......



Don Wilhelm wrote:
> 
> Eddy,
> 
> It is important where you set the audio passband.  Normally, there is no 
> lack of high frequency response with the 2.6kHz bandpass.
> 
> Using Spectrogram to set the SSB filters, I normally recommend that you 
> set markers at 300 Hz and the filter width plus 200 Hz - or in your 
> case, 2800 Hz.  Center the FL1 (OP1) passband between those markers and 
> try it out.  With most voices and microphones, those settings are 
> correct, and wil work quite well for receive as well.  For FL2, I use 
> the variable filter and set it 300 Hz less than FL1 - it is important to 
> measure the actual width with Spectrogram since at wide setting the 
> numbers shown by the K2 are usually incorrect.  Set the low frequency 
> corner of all the SSB filter passbands at 300 Hz to maintain 
> intelligibility as the filters are narrowed.
> 
> If you are 'netting' with other hams at a specific frequency, you should 
> check your dial calibration - if you are not tuned to the actual 
> frequency of the other hams (because your dial calibration is off), it 
> could be that your audio is OK, but you are placing your transmit 
> frequency a bit high or low.  The K2 Dial Calibration article on my 
> website http://w3fpr.qrpradio.com can give you the procedure for 
> obtaining good dial calibration.
> 
> If filter alignment as I have outlined does not solve your problem, you 
> may have a microphone that is lacking in response at the higher audio 
> frequencies, but the MH2 usually has a bit of boost for the highs - you 
> might want to see if one of the locals near you has an MH2 that you can 
> compare with.
> 
> 73,
> Don W3FPR
> 
> Eddy Avila wrote:
>> Happy Holidays All,
>>
>> Getting lousy SSB tx audio reports on K2, SN 3345. I
>> did the Elecraft-approved 2.6khz bandwith and using
>> the Heil MH2 mic.
>>
>> Specifically, I get reports I don't have enough highs
>> in my tx audio. I use the Spectrograph program to
>> align filters per KSB2
>>
>> On K2 receive, the audio is outstanding....as good as
>> my ICOM 746pro.
>>
>> Any help will be greatly appreciated!!
>>
>>   
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