[Elecraft] K2 Noise blanker- is it working?

[Stephen Prior]

I built the noise blanker kit for my K2 s/no. 4905 (I think) a few weeks
back, and I am beginning to wonder if it is working.  I can not tell any
difference between NB1, NB2, whether hi or lo threshold.

It is said that it works against the sort of pulse noise I get here from
power lines occasionally, yet it makes no difference.  Since all the cars in
the family are diesel powered and I am some distance from a quiet country
road, I have not had the opportunity to see whether it works on petrol
engined ignition noise.  My experience with noise blankers in other radios
is that you can usually hear some change when it is switched in, but I
don't.

Am I expecting too much?  Or could there possibly be a fault which would
still pass the rx signal through the noise blanker board and yet stop the
noise blanker working?  Had I not read how good it is supposed to be, and
had I not made it myself, I probably would not be asking the question!

Thanks

73 Stephen G4SJP