Re: K3 DSP AGC Question

Posted by ab2tc on Feb 08, 2010; 11:39pm
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4537911.html

Hi, I use the 200 ohm Heil proset and even with the AF gain set to "LO" I have no problem getting enough audio or distortion free audio. Either there is a number of defective prosets or K3s out there because this is making no sense at all.

Knut - AB2TC

Grant Youngman wrote

<snip>
There are two factors here.  One is impedance.  (The impedance actually presented by a headphone is frequency dependent and can vary widely from the "nominal" value).  The other is sensitivity.  

I regularly use 250 ohm headphones on the K3 with no issues whatsoever.  Why?  They require very little drive to reach an acceptable output level.  So even given their relatively high Z (compared to 32 ohms)  it isn't necessary to drive the output stage of the K3 into clipping or high distortion levels to get plenty of good audio.
<snip>
Grant/NQ5T
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