Re: : K3 receiver noise questionable test results

Posted by Julian, G4ILO on Dec 19, 2009; 10:17pm
URL: http://elecraft.85.s1.nabble.com/Re-K3-receiver-noise-questionable-test-results-tp4192141p4192921.html

Dunc Carter - W5DC wrote

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.

We're talking about SSB here but I also like the same kind of sound when receiving CW with the filter wide open. The idea is not to make the audio sound muffled and lose intelligibility. Personally I think the bass boost is more important to improving the sound than the treble cut. But a lot depends on what you are listening on. The K3 internal speaker has a lot more bass than headphones or many external speakers. I can't fault the audio on the internal speaker or on computer headphones plugged in round the back, using the settings given below, but two pairs of hi-fi stereo headphones and some external passive speakers (all of which probably 8 ohm impedance) are lacking in bass and tiring to listen to.

The settings I'm currently using are:
50Hz    +0
100Hz  +3
200Hz  +6
400Hz  +6
800Hz  +3
1600Hz +0
2400Hz -3
3200Hz -9

I do hope there will be mode dependent settings eventually because FM, in particular, doesn't need equalization like this.