[Elecraft] : K3 receiver noise questionable test results

[Julian, G4ILO]

Joe Subich, W4TV-4 wrote:
> 
> My tests with an audio spectrum analyzer using both broadband 
> noise and internally generated receiver noise show that the 
> K3 is flat from 100 Hz to 4100 Hz when using the 6 or 13 KHz 
> roofing filters with FC=2.10 and BW=4.00 to either speakers 
> or Line Out.  Headphone response is another issue that can be  
> addressed with the Rev C/Rev D DSP assemblies or replacing the 
> 10 uF headphone coupling capacitors with 100 uF caps and/or 
> using high impedance headphones.
> 

I agree the line output is pretty flat which is why the MP3 files I tried to
make didn't demonstrate the problem.

I think that rather than replace the DSP board I'll look for some high
impedance headphones. But even with them, I still feel the sound on SSB
needs some bass/mid range boost and a bit of extreme treble cut. I doubt if
the headphones need anywhere near 100mW of output to drive them so
overloading the amplifier should not be a problem.

-----
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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