[Elecraft] Removed Noise Blanker

[Don Wilhelm]

Chris,

If your K2 does receive, there must have been something installed in 
place of the noise blanker.
Normally, without the KNB2 installed, R88, R89 and R90 serve as a 6 dB 
pad following the post mixer amplifier.  If the 6 dB pad is not 
installed (such as a simple jumper installed), the receiver would 
function, but the termination of the post-mixer amplifier and IF filter 
input would not be correct, so the dynamic range and IMD could be 
compromised.  Check to see if there is that 6 dB pad connected anywhere 
in the vicinity of the KNB2 loaction - if it is not, then restore the 
original resistors.

73,
Don W3FPR

Hans-Christoph Scheiblberger wrote:
> I bought my K2 on the used market and I realized that the previous owner had removed the Noise Blanker and W5, R88,R89 and R90 were not reinstalled.Does this affect rx performance?Should I install these parts again?
>
> 73, Chris
>