[Elecraft] Re: Elecraft Digest, Vol 28, Issue 28

[David Walker]

You are right Jim... my comments weren't helpful and I apologise for  
making them.
Minutes after hitting the send the regret began.

I had installed the KNB2 a few years ago and it's just that I have not  
found
it to work even with impulse noise.  I had heard the demo sound file before
I installed the KNB2 and I have been frustrated that mine doesn't work as  
per
the demo sound file indicates.  I have also had conversations with others  
who
have had similar results.

I actually have been tempted to purchase a second kit and install it just  
in case
there is a fault with mine, but I have since moved and now I don't have  
much
need for a noise blanker, so this idea was shelved a year ago.

The NB in my K2 won't even have any impact on noise that my PROII noise  
blanker
and my FT-101Z noise blanker kills dead.  However, in saying that I still  
sold my
PROII because my K2 is a much better radio to listen to and the KNB2  
doesn't
detract from it being a first class bit of kit.  In fact, after several  
years of
owning it this year it became my main station radio.

Regards,

Dave




On Mon, 28 Aug 2006 18:02:25 +1000, <elecraft-request at mailman.qth.net>  
wrote:

> A blanket "It doesn't. Don't waste your time--" isn't really a good thing
> to say at this time.  #1, it DOES work on many types of impulse noise.   
> If
> you are looking to eliminate atmospheric static noise (QRN) then yes, it
> doesn't work.  Pulse type ignition noise from vehicles passing your
> location, or running near you, it does an excellent job of removing.   
> Also,
> much of the power line noise caused by leaky/cracked insulators and bad
> grounds on your nearby power lines are usually effectively removed by the
> KNB2.  This is what the KNB2 was designed to do, and it is actually  
> better
> at this job than the NB in my IC-706MKIIG and other rigs I have had in  
> the
> past.
> Again, if you are trying to eliminate QRN, there isn't anything  
> available in
> ANY rig that I know of that will do that.
> Another thing to consider -- any time the noise blanker is ON, it will  
> cause
> distortion in the received audio of the station you are listening to if
> there is a reasonably strong signal within 5 to 10 KHz of the signal you  
> are
> trying to receive.  This occurs with ANY noise blanker, not just the  
> KNB2.
> Jim Sheldon, W0EB
> K2 #4338