[Elecraft] K1 NB

[Brett Howard]

I have a noise at my place that comes on at night and is a random pulse type
noise.  Essentially on a spec an it looks like a bunch of very narrow spikes
that jump all over the place.  A peak hold trace draws a new noise floor by
connecting the spike peaks about 20dB over the actual floor.

In my Kenwood TS-450S both NB1 and NB2 seem to have about the same effect on
the noise and it does a pretty good job.  But the K1 seems to be completely
ineffectual on this noise.  Could it be that it's a construction issue?  I'm
not fully familiar with how they work or where I'd start figuring out this
one.