[Elecraft] How does K2 NB work?

[David Toepfer]

--- "Fred (FL)" <ncsailors at yahoo.com> wrote:
> I had experienced a situation where we had major trucks near our house
> (cement job) - and the ignition or engine electrical noise was major.
> The NB, in either setting - semmed to do nothing noticeable to remove
> this type of noise.

--- Don Wilhelm <w3fpr at earthlink.net> wrote:
> The KNB2 does a good job on impulse noise - those noise pulses with a fast
> rise time such as ignition noise.  I can't explain why it did not attack the
> ignition noise from the cement trucks.


This is probably because it was not ignition noise.  Cement trucks typically
use diesel engines (no spark ignition system).  If the cement trucks had
generators (as opposed to alternators) in them (older electrical system or DC
welder on-board) in them or if they had on-board DC motor pumps/mixers then
what you probably heard was motor noise made by brush arcing.