[Elecraft] : K3 receiver noise questionable test results

[Duncan Carter]

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
>
>