Is there a simple way to check if the noise blanker for the K2 works? I
tried to use it tonight but it didn't seem to make any difference. Then
I tried turning a switch on a fan on and off, that produced S7 noise
spikes on the S meter, but the noise blanker didn't seem to make a
difference.
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
I'm in the process of trying to bring an early K2 (serial#653) kicking and
screaming
into the 21st Century, I'll also point out that I'm not the original builder
of this
radio.
For a while I've not been overly convinced about the sensitivity and dynamic
range of this particular example, it
Excellent response to building/parts questions is available at
supp...@elecraft.com.
73
Neil NJ6L
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Post:
I'm in the process of trying to bring an early K2 (serial#653) kicking and
screaming
into the 21st Century, I'll also point out that I'm not the original builder
of this
radio.
For a while I've not been overly convinced about the sensitivity and dynamic
range of this particular example, it
Guys,
Trying to build K2 Noise Blanker. Have part in kit labeled 6n8J63. Missing
part for C12 (.0068uF Disk or Monolithic Capacitor). Is Elecraft trying to use
this 6n8J63 for C12? I looked up data sheets on the 6n8J63 and it is an
inductor, ceramic prehaps wire wound. This can't be right?
.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
I am still getting the Not Installed message with the KNB2. I have built
and re-built the board, rewinding L1 and L2 twice and resoldering all the
joints again. Resistance between pins 1 and 6 is way up in the megohm
range. What should it be?Any suggestions would be welcome.
Brian
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
Pat and Don:
Thanks for the tips!! I will report back.
Brian
KB1VBF
http://home.comcast.net/~b.denley/index.html
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I wrote a week or so ago for some advice about testing my K2 noise blanker.
From the replies I received (thank you), I now know that my blanker is probably
working FB, but isn't well suited to blank the type of noise that plagues my
QTH.
So, I would like to ask anyone with the K2 DSP option
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
Hi all,
Speaking of the NB, mine is on the way now from Elecraft and I had a quick
question.
I read somewhere a long time ago (perhaps in the archives here of the
reflector) that the NB module reduces the sensitivity of the RX in the K2.
My questions are
- if so, by how much (i.e. is it
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
I built my K2 some months back with the KNB2 option. The noise blanker has
never been effective against any type of noise. The MCU recognizes the
blanker, it draws the proper amount of current, but just doesn't seem to do
anything. Before drinking the Kool-Aid (TM) I was pretty much a
I built my K2 some months back with the KNB2 option. The noise blanker has
never been effective against any type of noise. The MCU recognizes the
blanker, it draws the proper amount of current, but just doesn't seem to do
anything. Before drinking the Kool-Aid (TM) I was pretty much a
I built my K2 some months back with the KNB2 option. The noise blanker has
never been effective against any type of noise. The MCU recognizes the
blanker, it draws the proper amount of current, but just doesn't seem to do
anything. Before drinking the Kool-Aid (TM) I was pretty much a
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
I have tried it on various types of noises, some which sounded like auto
ignition noise, I think someone had something running without resistor wires
or plugs, strong and weak signals, no change.
I did have a bad street light out front of my house, the reason I got the
NB, but they fixed it
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
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 noticeable at all with it on?
Brett
N2DTS
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
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brett Gazdzinski
Sent: Saturday, February 28, 2009 11:23 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] k2 noise blanker
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
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
I have been playing catch up with my K2 (#436) and recently installed
the A - B mods as well as adding the KAF2 AND KNB2 options. All was
well until I added the KNB2 option. When I added the KNB2 option, I
noticed that my output levels had dropped. I then discovered that I
had forgot to
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
When I first completed the K2 with the noise blanker option and ran some
tests, I also expected to hear more of a difference in backround noise
reduction. Unless it is repetitive pulse noise the blanker has no audible
effect which is good in some respects compared to other receivers like
the Icom
I built the noise blanker kit for my K2 s/no. 4905 (I think) a few weeks
back, and I am beginning to wonder if it is working. I can not tell any
difference between NB1, NB2, whether hi or lo threshold.
It is said that it works against the sort of pulse noise I get here from
power lines
The best way I have used to test the effectiveness of noise blanker is
try to use the radio in a house with a common incandescent lamp dimmer
nearby the antenna connection. Use a wire antenna placed near the lamp or
wiring of the dimmer circuit if necessary to increase the coupled noise.
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
Many thanks for all the suggestions! Since it is easier and quicker to take
the radio to a dimmer switch than it is to remove the covers and scratch the
top of a transistor, I shall do that first!
I am beginning to think that I was expecting too much from the circuit, and
that being elecraft it
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
I finished K2 #5665 a few weeks ago and have read the
discussions about how well the K2NB does or doesn't work.
I'm in an RV on a bluff on the Oregon Coast and we've just
had a thunder storm (with hail) pass over. The tip of the
screwdriver antenna's whip produced a few minutes of strong
, then use my narrowest DSP filter, which is set to
100Hz.
73,
Bob W1SRB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Lemkes
Sent: Friday, August 11, 2006 10:58 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K2 Noise Blanker Slot as Additional IF Amplifier
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
Has anyone thought of, or tried modifying the K2 Noise Blanker to be an
additional K2 IF amplifier stage?
My problem is that when I really, really need the crystal filter, I am
trying to copy a very weak (but readable) CW signal with adjacent S-9 QRM.
When I switch in tighter than about 1200
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
, 2006 10:44 AM
Subject: [Elecraft] K2 Noise Blanker Problem (Feature?)
Hi Gary, I finally discovered what the NB was doing on every other
threshhold change. What I had perceived
as a drop in level was actually the DSP Noise Reduction being turned on
and off. Each time the NB is switched from
/
_
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
/
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ralph McClintock
Sent: 9. november 2004 11:56
To: elecraft@mailman.qth.net
Subject: [Elecraft] K2 Noise Blanker Modifications
Hello,
Does anyone have any ideas about level and pulse width modifications for
the K2
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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Post to:
Hello,
Does anyone have any ideas about level and pulse width modifications for the
K2 Noise Blanker. My problem is neighbors electric fences and corrals. They
were built with aluminum, copper and steel wire intermixed and have over 300
twisted connections. I have replaced the old solenoid
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