[Elecraft] K3 NR needs improvement

[Johnny Siu]

Hello Eric,
 
As mentioned by other group members, this topic appears from time to time.  I am the one in this forum who insist on the NR of K3 is not as good as my big ICOMs.
 
I eventually find the answers for myself. I am a 99% SSB operator and my ears can still hear above 12Khz.  As a result, I am very sensitive to the artifact of the NR of K3.  While elecraft confirm the NR in KX3 is the same as K3, I find the audio of my KX3 is better in SSB than K3.
 
The notch filter of K3 can notch the annoying carrier.  Regrettably, it is outside the AGC loop and does not give any help if the offending carrier is desensing the AGC.

TNX & 73,


Johnny VR2XMC


________________________________
 寄件人︰ eric manning <emanning at cs.uvic.ca>
收件人︰ elecraft at mailman.qth.net 
傳送日期︰ 2013年09月5日 (週四) 12:33 PM
主題︰ [Elecraft]  K3 NR needs improvement
  

I'm a CW op, I'm baffled by the comments critical of the K3 NR, APF and 
notch filter.

The  NR generally removes ALL random noise, meaning that the rcvr is 
silent in the absence of signals. Admittedly,  It does get a little 
upset in the presence of
many strong signals, so I usually turn  it off in pileups.

The notch filter can be tuned manually to  silence  one interfering CW 
signal.
The APF  is a bit tricky,  you need to use fine tuning [ 3 digits after 
the VFO decimal point],
tune SLOWWLLY and listen for the weak signal to pop out  of the noise. 
But pop  out it does.

Eric VA7DZ