Re: : K3 receiver noise questionable test results

Posted by Dunc Carter - W5DC on Dec 19, 2009; 8:18pm
URL: http://elecraft.85.s1.nabble.com/Re-K3-receiver-noise-questionable-test-results-tp4192141p4192585.html

Is this for voice or cw reception?  The consonant sounds in voice, are
mainly contained in the 1600 to 3200 Hz range; rolling this range off is
likely to reduce voice readability.  Are there or will there be mode
dependent settings for the receive equalizer?  I've tried using an
external high/low/bandpass filter with the K3 on cw and it's not
beneficial for me but then my hearing is damaged with midrange loss and
distortion in one ear as a result of having meniere's disease.

73, Dunc, W5DC

Julian, G4ILO wrote:

>
> Joe Subich, W4TV-4 wrote:
>  
>>
>> If one is going to attempt to mimic the "pink noise" behavior,
>> there is no need to bother with the low frequency boost.  It
>> simply puts more strain on the audio amplifier, increasing the
>> amount of IMD products, with little or no aural benefit.  A
>> better RX EQ configuration with essentially the same perceived  
>> sound:
>>
>>   50:  -16 dB (reduce sub-vocal noise and hum)
>>  100:    0 dB
>>  200:    0 dB
>>  400:    0 dB
>>  800:    0 dB
>> 1600:   -3 dB
>> 2400:   -5 dB
>> 3200:   -6 dB  
>>
>>
>>    
>
> I agree the 50Hz boost adds nothing useful, but I find to increase the 100,
> 200 and 400 values make the audio sound more balanced and easier on the
> ears. This is not boosting the bass so much as trying to compensate for the
> bass roll-off inherent in the K3.
>
> I will agree that low frequencies have no benefit when trying to copy weak
> signals but surely it is the role of the filtering to cut out those
> frequencies by manual adjustment when trying to receive a weak signal? The
> purpose of equalization is to achieve a pleasant and balanced audio response
> for general use.
>
> -----
> Julian, G4ILO. K2 #392  K3 #222.
> * G4ILO's Shack - http://www.g4ilo.com
> * KComm - http://www.g4ilo.com/kcomm.html
> * KTune - http://www.g4ilo.com/ktune.html
>
>  

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