[Elecraft] [K2] Noise Blanker problem

[Brian Denley]

Pat and Don:
Thanks for the tips!!  I will report back.

Brian 
KB1VBF
http://home.comcast.net/~b.denley/index.html
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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

Re: [Elecraft] [K2] Noise Blanker problem

[Don Wilhelm]

  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 are the 4 MHz resonator or the firmware chip itself.

73,
Don W3FPR

On 1/29/2011 9:12 PM, Brian Denley wrote:
> 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
> KB1VBF
>
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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

[Elecraft] [K2] Noise Blanker problem

[Brian Denley]

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
KB1VBF
http://home.comcast.net/~b.denley/index.html 

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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

Re: [Elecraft] K2 Noise Blanker Problem

[David Woolley (E.L)]

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? 
One of the commonest problems with noise blanking is that people don't 
understand that it is only suitable for wideband, impulsive noise.

-- 
David Woolley
"we do not overly restrict the subject matter on the list, and we
encourage postings on a wide range of amateur radio related topics"
List Guidelines 
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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

Re: [Elecraft] K2 Noise Blanker Problem

[drewko]

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 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 Kenwood man 
>and was used to ineffective noise blankers so I ended up blowing it off.  I 
>recently built a K1, and the NB in it works FB.  This got me thinking, and 
>besides Elecraft would never release a NB that was useless--it violates the 
>Tao of Elecraft.  Yesterday I built another KNB2 (any excuse) and installed it 
>in my K2.  Same result!  I checked all the solder joints, component values, RF 
>board mods.  It makes no difference whether it is NB1, NB2, HI or LO, the 
>preamp is on or off--nothing.  No change in S-meter reading, no change in 
>audio.  Any ideas, oh mighty brains?  
>
>Thanks, Eric WD6DB(lost in noise)  
>__

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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

Re: [Elecraft] K2 Noise Blanker Problem

[Don Wilhelm]

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 the clicks from the impulse noise and the rush of 
'antenna/band noise' that happens because the screwdriver shaft can act 
as an antenna.

If you find the NB is responding to that test, but it still does not 
help with your noise source, you can try widening the gate time a bit - 
try adding an additional .001 uF capacitor in parallel with C11 (just 
soleder ti to the solder pads for a test - if that helps, you can either 
leave the parallel cpacitor in place or change C11 to .002 uF.  Other 
values may help as well, so some experimentation may be of help.  If the 
noise gate is widened too much you will begin to notice "holes" on the 
received signal.

73,
Don W3FPR

eric norris wrote:
> 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 Kenwood man 
> and was used to ineffective noise blankers so I ended up blowing it off.  I 
> recently built a K1, and the NB in it works FB.  This got me thinking, and 
> besides Elecraft would never release a NB that was useless--it violates the 
> Tao of Elecraft.  Yesterday I built another KNB2 (any excuse) and installed 
> it in my K2.  Same result!  I checked all the solder joints, component 
> values, RF board mods.  It makes no difference whether it is NB1, NB2, HI or 
> LO, the preamp is on or off--nothing.  No change in S-meter reading, no 
> change in audio.  Any ideas, oh mighty brains?  
>
> Thanks, Eric WD6DB(lost in noise)  
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> 
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com 
> Version: 8.5.409 / Virus Database: 270.13.70/2329 - Release Date: 08/27/09 
> 08:11:00
>
>   
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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

[Elecraft] K2 Noise Blanker Problem

[eric norris]

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 Kenwood man 
and was used to ineffective noise blankers so I ended up blowing it off.  I 
recently built a K1, and the NB in it works FB.  This got me thinking, and 
besides Elecraft would never release a NB that was useless--it violates the Tao 
of Elecraft.  Yesterday I built another KNB2 (any excuse) and installed it in 
my K2.  Same result!  I checked all the solder joints, component values, RF 
board mods.  It makes no difference whether it is NB1, NB2, HI or LO, the 
preamp is on or off--nothing.  No change in S-meter reading, no change in 
audio.  Any ideas, oh mighty brains?  

Thanks, Eric WD6DB(lost in noise)  
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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

[Elecraft] K2 Noise Blanker Problem

[eric norris]

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 Kenwood man 
and was used to ineffective noise blankers so I ended up blowing it off.  I 
recently built a K1, and the NB in it works FB.  This got me thinking, and 
besides Elecraft would never release a NB that was useless--it violates the Tao 
of Elecraft.  Yesterday I built another KNB2 (any excuse) and installed it in 
my K2.  Same result!  I checked all the solder joints, component values, RF 
board mods.  It makes no difference whether it is NB1, NB2, HI or LO, the 
preamp is on or off--nothing.  No change in S-meter reading, no change in 
audio.  Any ideas, oh mighty brains?  

Thanks, Eric WD6DB(lost in noise)  
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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

[Elecraft] K2 Noise Blanker Problem

[eric norris]

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 Kenwood man 
and was used to ineffective noise blankers so I ended up blowing it off.  I 
recently built a K1, and the NB in it works FB.  This got me thinking, and 
besides Elecraft would never release a NB that was useless--it violates the Tao 
of Elecraft.  Yesterday I built another KNB2 (any excuse) and installed it in 
my K2.  Same result!  I checked all the solder joints, component values, RF 
board mods.  It makes no difference whether it is NB1, NB2, HI or LO, the 
preamp is on or off--nothing.  No change in S-meter reading, no change in 
audio.  Any ideas, oh mighty brains?  

Thanks, Eric WD6DB(lost in noise)  
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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

Re: [Elecraft] K2 Noise Blanker Problem (Feature?)

[John Reiser]

Hi Harvey,

This is for you.  As I said before on this list, If you are having QRN, try 
turning on the KNB2.  On some types, particularly anoying kind kind that 
sounds like frying bacon, it works superbly.  But it doesn't work for all 
kinds of QRN in my experience.  No noise blanker does.


I always try changing the threshhohd as well.  Most of the time I notice no 
change, but sometimes it makes the difference between being able to copy a 
signal and not.  Of course, this assumes that your KNB2 is correctly built.


73,

John (W2GW)

- Original Message - 
From: "Harvey Howell" <[EMAIL PROTECTED]>
To: "Bob Patten" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; "Elecraft 
Reflector" ; "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 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" 
; "Lyle Johnson" <[EMAIL PROTECTED]>

Sent: Sunday, April 09, 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
low to high threshhold, the DSP NR is either turned on or off depending 
on its present state.  I guess I should
consider this a bonus, since I only have to push one key (albeit twice) 
for NR instead of pushing Display
and Band+.   Now though, I'm wondering if this behaviour is unique to my 
K2 or if any with both Noise Blanker
and DSP installed exhibit the same?  You said you didn't hear any change 
on yours when cycling NB threshhold, but

did that K2 also have DSP installed?

I'll post this to the list also - maybe someone else can verify whether 
this is unique to mine or common to all...


--
73, Bob Patten, N4BPPlantation, FL

E-Mail: [EMAIL PROTECTED]   Website: http://www.qsl.net/n4bp
QRP ARCI #3412SOC #1ARS #799SMIRK #6625  FISTS #7871

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com


--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.385 / Virus Database: 268.4.0/305 - Release Date: 4/8/2006






--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.385 / Virus Database: 268.4.0/305 - Release Date: 4/8/2006

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com




___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Re: [Elecraft] K2 Noise Blanker Problem (Feature?)

[Harvey Howell]

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" ; 
"Lyle Johnson" <[EMAIL PROTECTED]>

Sent: Sunday, April 09, 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
low to high threshhold, the DSP NR is either turned on or off depending on 
its present state.  I guess I should
consider this a bonus, since I only have to push one key (albeit twice) 
for NR instead of pushing Display
and Band+.   Now though, I'm wondering if this behaviour is unique to my 
K2 or if any with both Noise Blanker
and DSP installed exhibit the same?  You said you didn't hear any change 
on yours when cycling NB threshhold, but

did that K2 also have DSP installed?

I'll post this to the list also - maybe someone else can verify whether 
this is unique to mine or common to all...


--
73, Bob Patten, N4BPPlantation, FL

E-Mail: [EMAIL PROTECTED]   Website: http://www.qsl.net/n4bp
QRP ARCI #3412SOC #1ARS #799SMIRK #6625  FISTS #7871

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com


--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.385 / Virus Database: 268.4.0/305 - Release Date: 4/8/2006






--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.385 / Virus Database: 268.4.0/305 - Release Date: 4/8/2006

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Elecraft] K2 Noise Blanker Problem (Feature?)

[Bob Patten]

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
low to high threshhold, the DSP NR is either turned on or off depending 
on its present state.  I guess I should
consider this a bonus, since I only have to push one key (albeit twice) 
for NR instead of pushing Display
and Band+.   Now though, I'm wondering if this behaviour is unique to my 
K2 or if any with both Noise Blanker
and DSP installed exhibit the same?  You said you didn't hear any change 
on yours when cycling NB threshhold, but

did that K2 also have DSP installed?

I'll post this to the list also - maybe someone else can verify whether 
this is unique to mine or common to all...


--
73, Bob Patten, N4BPPlantation, FL

E-Mail: [EMAIL PROTECTED]   Website: http://www.qsl.net/n4bp
QRP ARCI #3412SOC #1ARS #799SMIRK #6625  FISTS #7871

___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft


Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com