[Elecraft] KNB2 - looking for experience with mods that made it effective

[Ron D'Eau Claire]

If you have a cheap lamp dimmer around the house it will provide an
excellent test to see if your current noise blanker is doing what it was
designed to do. I'm thinking of the dimmers that produce a raucous buzz in
the receiver whenever they are set about half-bright. The K2 noise blanker
kills such noise in my rig very nicely. Ignition noise from an engine can do
that too. If you don't have a cheap lamp dimmer, string a wire near the
engine of your automobile or lawn mower to pick up the pop-pop of the spark
plugs firing. 

If it kills that stuff, it is doing what it was designed to do - blank out
repetitive high-amplitude noise pulses by literally interrupting the receive
signal path during the noise interval. That technology is not effective
against random or broad-band noise. 

IIRC, some of the mods lengthened the period during which the receive signal
path was cut off. That's a design trade-off. The longer the cutoff period,
the more *everything* is blanked. 

The K3 and KX3, use DSP to tackle noise reduction in quite different ways
and can handle a much wider range of noise types. 

73 Ron AC7AC 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Stan AE7UT
Sent: Wednesday, October 09, 2013 2:07 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KNB2 - looking for experience with mods that made it
effective

I just recently built the KNB2 and it does not seem to be very effective for
the noise pulses near my house.
I also put a the KNB1 in my K1 with disappointing results.
I'm comparing this to my K3 and KX3 that almost completely eliminate the
noise.


Doing some internet research there appears to be a couple of mods that
people embrace.
I was looking at LA3ZAs site and he shows two mods.

Any advice before I start slinging solder?

Thanks
Stan AE7UT






--
View this message in context:
http://elecraft.365791.n2.nabble.com/KNB2-looking-for-experience-with-mods-t
hat-made-it-effective-tp7579755.html
Sent from the Elecraft mailing list archive at Nabble.com.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html