Re: : K3 receiver noise questionable test results

Posted by Julian, G4ILO on Dec 19, 2009; 8:01pm
URL: http://elecraft.85.s1.nabble.com/Re-K3-receiver-noise-questionable-test-results-tp4192141p4192537.html

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.