[Elecraft] Yet another KX-1 Question

[Glen Johnstone]

Ron,
   
  Thanks for the info.  You are correct about the testing.  I wouldn't have even done my test except it 'sounded' low.  
   
  I'll be troubleshooting tonight.  I may have miswound T2 or goofed on a component sub or better yet, soldered 'em to the wrong pads.  I'll post my findings.
   
  73,
  Glen, NK1N 
   
  PS. I know you meant "origanal KX1".

Ron D'Eau Claire <rondec at easystreet.com> wrote:
  Glen, NK1N wrote:
I agree on the receiver sensitivity. I aligned my 2 band KX-1 with a -103
dBm signal. When I used a -73 dBm signal (standard S9), I got 4-5 bars on
the S-meter for 40 and 20. Perfect!

After building and installing the KXB3080 and doing all the RX alignments,
I find the -73 dBm signal barely lights 2 bars on 20. Hmmm.

I expect the KX1 20m circuitry was compromised to pull it down to 80m.

-------------------------------------

Just the opposite Glen. 

The receiver front end circuitry was redesigned to operate very efficiently
across the 80-20 meter range. The original KXB3080 uses a simple
capacitively-coupled input circuit. The KXB3080 mod replaces this with a
transfomer-coupled input. 

I wouldn't suggest how effective looking at the "S-Meter" is for evaluating
receiver performance. I haven't tried it. Running actual SN+N/N sensitivity
tests, I found the end result was actually slightly *better* receiver
performance on all four bands.

Ron AC7AC

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