[Elecraft] KNB2 Noise Blanker Problem?

[Ron D'Eau Claire]

Just finished the Noise Blanker for the K2.  In trying it out, I can't see
that NB1 makes any appreciable difference
> to a high AC-type noise level, although the NB in my FT-1000MP knocks it
out fairly well...
> Van, W1WCG
> K2 #2634

I assume you mean something like a lamp dimmer or other source of big
spikes.

I have found that to get my Noise Blanker to work in many situations, I must
use the Preamplifier. Setting Low Threshold doesn't do it either. But
turning on the preamp will cause the noise to virtually disappear.

Ron AC7AC
K2 # 1289