[Elecraft] K3 IF Mod - Is it needed or not?

[Bill W4ZV]

K4SC wrote:
> 
> I have K3 #3332 which I built in August of last year (I think).  I also
> have P3 #302.  I am not sure whether my K3 has the IF output mod already
> installed or not.  I believe the transition was September.  Is there
> anyway to definitively tell whether or not I have it?  My P3 seems to
> "see" signals just fine.  As an example, just now on 40 meters noise seems
> to be centered at approximately -115 dbm with my vertical connected and
> -125 when I switch to Antenna 2, which is not connected.  Does that sound
> about where it should be.  I really do not want to alter the PC board on
> my K3 for no reason.  Your comments would be appreciated.  Chuck K4SC.
> 

Remove the bottom front panel on the K3.  Look for R8 as shown in the photos
here:

http://www.elecraft.com/K3/mods/IF_Output_Buffer_Gain_Mod_Rev_A.pdf

If you see "133" marked on R8, the value is correct and the mod is not
necessary.  The mod makes ~10 dB sensitivity improvement which might not be
noticeable on 40m with the atmospheric noise we have now.

73,  Bill
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