Ron,
Yes, there is a simple test. Turn on the Preamp, do not connect an
antenna, and tap the case of Q21 with something metallic (like a
screwdriver). You will hear clicks along with bursts of sound because
the screwdriver is acting as an antenna (it is important to distinguish
between the
Excellent response to building/parts questions is available at
supp...@elecraft.com.
73
Neil NJ6L
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Post:
.0068uF is 6.8nF. That capacitor labelled 6n8 is the right one (ignore
the J63, which refer to the tolerance etc).
73 Dave G3YMC
On 16 Jul 2011 at 0:44, vicki glover wrote:
Guys,
Trying to build K2 Noise Blanker. Have part in kit labeled 6n8J63.
Missing part for C12 (.0068uF Disk or
Brian,
A Not Installed indication for any K2 option indicates a problem with
either that option's microprocessor or a continuity on the AUXBUS
signal. Check the soldering, especially at the KNB2 firmware chip pin
1, as well as the other pins of the firmware chip.
The other possibilities
Doug,
I am not going to really answer your question, but give it some food
for thought - most true Noise Blankers will not work on RF hash (which
I would interpret as a frying noise mainly because it is too
constant. If such a constant noise were to be blanked (the IF would be
interrupted
Don Wilhelm wrote:
First do a test to see if your NB is working at all. Remove the
antenna, turn on the Preamp, then tap on the case of Q21 with a
screwdriver. The taps will create impulse noise in the receiver which
Has it actually been established that the problem noise is impulsive?
The K2 NB works very well with light-dimmer noise. If you have a
light-dimmer to test it the results should be dramatic.
73,
Drew
AF2Z
On Thu, 27 Aug 2009 13:20:22 -0700 (PDT), Eric WD6DB(lost in noise)
wrote:
I built my K2 some months back with the KNB2 option. The noise blanker has
never
Eric,
First do a test to see if your NB is working at all. Remove the
antenna, turn on the Preamp, then tap on the case of Q21 with a
screwdriver. The taps will create impulse noise in the receiver which
should be blanked when NB1 or NB2 is turned on. Be careful to
differentiate between
Brett,
My K2 noise blanker is not doing a lot but there are a few modifications
around, which can be found in the internet.I haven´t tried them yet...
73, Chris
Brett Gazdzinski wrote:
I have the noise blanker in my K2, and I have yet to find a noise it does
anything with.
It seems to
Brett Gazdzinski wrote:
I have the noise blanker in my K2, and I have yet to find a noise it does
anything with.
It seems to have no impact at all on the receiver, no matter what
settings.
I did remove the bypass jumper, but it does not act like it
Is it supposed to be
enough.
Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of OE5CSP-Chris
Sent: Sunday, March 01, 2009 12:50 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] k2 noise blanker
Brett,
My K2 noise blanker
Brett Gazdzinski wrote:
I have the noise blanker in my K2, and I have yet to find a noise it does
anything with.
It seems to have no impact at all on the receiver, no matter what settings.
The noise blanker is effective on man-made noise or automobiles, NOT RF
(white noise).
Ron
wb1hga
ron wrote:
Brett Gazdzinski wrote:
I have the noise blanker in my K2, and I have yet to find a noise it does
anything with.
It seems to have no impact at all on the receiver, no matter what settings.
The noise blanker is effective on man-made noise or automobiles, NOT RF
(white
Hi Brett,
Last summer, I had similar questions about the KNB2 in my K2. In my
case, a neighbor had put up a new electric fence and I was getting QRM
in the form of a pulse every second. The unmodified KNB2 seemed to
have little to no effect on the noise. In fact, I questioned whether
Joe,
I will try this, thanks!
Brett
N2DTS
- Original Message -
From: Joe Planisky jp...@jeffnet.org
To: Brett Gazdzinski brett.gazdzin...@verizon.net
Cc: elecraft@mailman.qth.net
Sent: Sunday, March 01, 2009 6:03 PM
Subject: Re: [Elecraft] K2 noise blanker
Hi Brett,
Last summer, I
Sent: Sunday, March 01, 2009 6:03 PM
Subject: Re: [Elecraft] K2 noise blanker
Hi Brett,
Last summer, I had similar questions about the KNB2 in my K2. In my
case, a neighbor had put up a new electric fence and I was getting QRM
in the form of a pulse every second. The unmodified KNB2 seemed
IMX with the K2 Noise Blanker there's little or no degradation of normal
signals. However, it can produce intermod noise when strong signals are
present. After all, it does punch holes in the signal where the noise
pulses would normally be. That action makes the noise blanker a mixer as
well which
Brett,
To induce a noise that your KNB2 *should* blank, turn on the preamp and
tap on Q21 with a metal screwdriver - the clicks should disappear with
the NB on, which will tell you that your KNB2 is working.
If the noise blankiing is not effective with the particular noise you
are dealing
The noise blanker on my K2 is _very_ effective at eliminating the
power-line noise in the area. Many time with it off the noise level is
around S9 or higher and unless signals are very loud I just can't hear
them. Turn on the NB, and the noise disappears and I hear signals.
When I first
Hi Brett,
I don't have a K2, but I do have a K3. At first I too thought that my NB
board wasn't working, but after tuning around a few bands, I did find some
electrical hash that the NB removed right away.
73,
James KC2UEE
-Original Message-
From: elecraft-boun...@mailman.qth.net
Jack,
On the K3, hold down the NB button until you see the DSP menu. Rotating VFO
A will change the DSP settings while rotating VFO B will change the IF
settings.
When I come across power line noise for example, I'll usually set the IF
setting to NAR1 and adjust the DSP setting until the
Sometimes turning on the preamplifier makes a world of difference, even when
low threshold is selected. I realize that the preamplifier is not needed on
the lower frequency bands and normally would be turned off to preserve the
dynamic range of the receiver. But this is a case where raising the
Another good source of in-home switching hash is the ubiquitous external
low-voltage halogen lamp power supply. In my experience, some of them are
completely quiet, some of them are anything but. If you have one of the
latter, though, you probably already know that. :-)
Bill / W5WVO
[EMAIL
Stephen,
Turn the preamp on and scratch/tap the Q21 case with a metallic object
(screwdriver) while turning the NB on and off. If the NB is working,
you will hear the sharp impulse clicks substantially reduced.
Many types of power line noise are not handled by the KNB2, it is great
on
I just installed one in my K2. I tested it by turning on a light
dimmer switch on the other side of the house which generates an S5
noise level on 80m. The K2NB totally eliminated it.
73,
Drew
AF2Z
On Thu, 03 May 2007 04:02:42 +, you wrote:
I finished K2 #5665 a few weeks ago and have
Dick,
If your filters are adjusted correctly (best done using Spectrogram, as
others have mentioned), it may be that you're not tuning the CW signal to the
center of the filter's band pass (usually set to 600Hz). I recently added a CW
tuning indicator to my K2, and now, once the
Hi Dick,
The variable crystal filters in the K2 are very good. In fact the best I
have ever used. As Don says, unless you have a bad component, crystal
filtering should be excellent down to about 250 Hz, and the DSP down to 100
Hz before you get a bit of attenuation of signal. You can even
Dick,
Not an IF amplifier stage, but an added IF filter - check out
http://homepages.nildram.co.uk/%7Ebaker/K2_Overview.html to see if that
might address your stated needs.
If you have filter loss at bandwidths less than 1200 Hz, then I would
conclude that you have something wrong with your
[EMAIL PROTECTED]
To: Bob Patten [EMAIL PROTECTED]; [EMAIL PROTECTED]; Elecraft
Reflector elecraft@mailman.qth.net; Lyle Johnson [EMAIL PROTECTED]
Sent: Sunday, April 09, 2006 8:51 PM
Subject: Re: [Elecraft] K2 Noise Blanker Problem (Feature?)
Hi Bob. I tried switching the NB threshold and it has
Hi Bob. I tried switching the NB threshold and it has no effect on the NR on
my K2 s/n 5022.
Harvey KN6VP
- Original Message -
From: Bob Patten [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; Elecraft Reflector elecraft@mailman.qth.net;
Lyle Johnson [EMAIL PROTECTED]
Sent: Sunday, April
/
_
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: 17. november 2004 02:21
To: [EMAIL PROTECTED]; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 Noise Blanker Modifications
Hi Sverre,
The link to VE3MCF for the mod to increase KNB2 time constant does not seem
to work anymore. Any
Did you get a reply to your question?
In case you did not, there were some noise blanker mods for pulse widths a
long time ago. They can also be found on the K2 Mods list, see
http://www.qslnet.de/la3za/K2/mod.html under General mods and KNB2.
73
Sverre
LA3ZA
http://www.qsl.net/la3za/
Hi Sverre,
The link to VE3MCF for the mod to increase KNB2 time constant does not seem
to work anymore. Any other source of the mod details for suggested values for
C11/C12?
Regards,
Bob, G3VVT
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