How can the KNB2 be tested?
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Hi,
I have also recently built this unit and the only way I could test it was by scratching the antenna input with a metal object. I can hear that it removes the 'clicks' out of the peaks, but I have not been able to test it against real pulse noise. Whatever else I have tried hasn't seemed to make a difference, then again, it may not have been pulsed noise. 73 Robin OZ6ABM _______________________________________________ Elecraft mailing list Post to: [hidden email] 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: How can the KNB2 be tested?
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Hi, Robin!
Do you have a cheap lamp dimmer (the type that works with incandescent lamps only)? Most of them emit a terrible buzz when set to half-brilliance. The KNB2 is excellent for removing that noise. You are absolutely correct: the KNB2 requires a train of evenly spaced pulses, such as those produced by a lamp dimmer, unshielded auto ignition, etc. It can't do much for random noise since it "anticipates" the timing of the pulses is even. When the pulse interval varies widely, it gets the timing wrong and blanks at the wrong instant. Also, sometimes annoying noise is too low in level for the circuit to trigger, even in low threshold position. I have discovered that on 80 meters particularly. Turning on the Preamp, even though it's not otherwise needed, will often make the noise disappear by bringing its level up to where the noise blanker is being triggered properly. Ron AC7AC -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Robin Kiszka-Kanowitz Sent: Monday, December 26, 2005 10:54 AM To: [hidden email] Subject: [Elecraft] How can the KNB2 be tested? Hi, I have also recently built this unit and the only way I could test it was by scratching the antenna input with a metal object. I can hear that it removes the 'clicks' out of the peaks, but I have not been able to test it against real pulse noise. Whatever else I have tried hasn't seemed to make a difference, then again, it may not have been pulsed noise. 73 Robin OZ6ABM _______________________________________________ Elecraft mailing list Post to: [hidden email] 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: [hidden email] 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 |
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In reply to this post by Robin Kiszka
I have three sources in my home that the KNB2 works well on and is great for
testing: 1) As Ron says...any light dimmer or touch-operated lamp 2) Electric razor plugged into the wall or held near the radio 3) Electronic ignition of my furnace...turn up the heat and listen to the zapping of the ignitor for a few seconds. As far as working other K2's...I called CQ on 10M during the summer on a dead band and a VP8 with a K2 came back. He's the only one I know with whom I had a 2-way K2-K2 QSO. Where do you like to hang out on HF Robin? Maybe you can generate a pileup of K2's calling you? 73 de Tom K2TA ----- Original Message ----- From: "Robin Kiszka-Kanowitz" <[hidden email]> To: <[hidden email]> Sent: Monday, December 26, 2005 1:53 PM Subject: [Elecraft] How can the KNB2 be tested? Hi, I have also recently built this unit and the only way I could test it was by scratching the antenna input with a metal object. I can hear that it removes the 'clicks' out of the peaks, but I have not been able to test it against real pulse noise. Whatever else I have tried hasn't seemed to make a difference, then again, it may not have been pulsed noise. 73 Robin OZ6ABM _______________________________________________ Elecraft mailing list Post to: [hidden email] 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: [hidden email] 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: How can the KNB2 be tested?
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In reply to this post by Robin Kiszka
Robin that is a good way to test it, also scratching on the preamp
transistor will cause the same noise. You will find it is very effective at removing ignition noise from cars. I've used my K2 mobile and it's one of the most effective spark plug noise removers I've ever seen. Gregg R. Lengling, W9DHI, Un-Retired K2/100 SN 3075 http://www.milwaukeehdtv.org ----- Original Message ----- From: "Robin Kiszka-Kanowitz" <[hidden email]> To: <[hidden email]> Sent: Monday, December 26, 2005 12:53 PM Subject: [Elecraft] How can the KNB2 be tested? Hi, I have also recently built this unit and the only way I could test it was by scratching the antenna input with a metal object. I can hear that it removes the 'clicks' out of the peaks, but I have not been able to test it against real pulse noise. Whatever else I have tried hasn't seemed to make a difference, then again, it may not have been pulsed noise. 73 Robin OZ6ABM _______________________________________________ Elecraft mailing list Post to: [hidden email] 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: [hidden email] 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 |
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In reply to this post by Tom Althoff
On Mon, 26 Dec 2005, Tom Althoff wrote:
> I have three sources in my home that the KNB2 works well on and is great for > testing: > > 3) Electronic ignition of my furnace...turn up the heat and listen to the > zapping of the ignitor for a few seconds. My KNB2 has never worked with furnace interference whatsoever. Perhaps I have a random width ignitor? 73,Thom-k3hrn www.zerobeat.net Home of QRP Web Ring, Drakelist home page,Drake Web Ring, Free Classified Ads for amateur radio, QRP IRC channel, Drake IRC Channel, Elecraft Owners Database www.tlchost.net/hosting/ *** Web Hosting as low as 3.49/month _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Hi Thom!
Do you have oil heat? They say gas heat is cleaner. Perhaps the ignitor produces short clean noise spikes in my furnace? LOL. Seriously...if you have problems with the furnace ignition one thing that worked GREAT for me and did not mess up the radio with intermod products was that noise cancelling antenna from MFJ...hmmm...the 1024 or 1026? That worked 100% to eliminate the noise when I used it with the internal noise whip. I always used it with a foot switch though instead of relying on the internal RF sensing relay. Have a happy new year! 73 de Tom K2TA ----- Original Message ----- From: "Thom R LaCosta" <[hidden email]> To: "Tom Althoff" <[hidden email]> Cc: <[hidden email]> Sent: Monday, December 26, 2005 3:00 PM Subject: Re: [Elecraft] How can the KNB2 be tested? > On Mon, 26 Dec 2005, Tom Althoff wrote: > > > I have three sources in my home that the KNB2 works well on and is great for > > testing: > > > > 3) Electronic ignition of my furnace...turn up the heat and listen to the > > zapping of the ignitor for a few seconds. > > My KNB2 has never worked with furnace interference whatsoever. > > Perhaps I have a random width ignitor? > > 73,Thom-k3hrn > www.zerobeat.net Home of QRP Web Ring, Drakelist home page,Drake Web Ring, > Free Classified Ads for amateur radio, QRP IRC channel, Drake IRC Channel, > Elecraft Owners Database > www.tlchost.net/hosting/ *** Web Hosting as low as 3.49/month _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Robin Kiszka
I haven't installed my KNB2 yet, but I was thinking that a hair dryer
with an AC/DC motor (i.e., with brushes) should be a fine noise generator. Other possibilities might include an electric shaver or a power drill. Good luck, John AA0VE _______________________________________________ Elecraft mailing list Post to: [hidden email] 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: How can the KNB2 be tested?
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Many of us can only wish we had the problem you fellows have--an
environment so quiet you have to contrive a noise source to test the noise blanker. Deteriorating power line equipment in my neighborhood generates nearly constant noise. When it gets really bad, I call the power company, and they fix the worst of it. But their fixes are only temporary. Thankfully, the KNB2 is incredibly effective. Dick, K0KK On Dec 26, 2005, at 2:25 PM, John R. Lonigro wrote: > I haven't installed my KNB2 yet, but I was thinking that a hair > dryer with an AC/DC motor (i.e., with brushes) should be a fine > noise generator. Other possibilities might include an electric > shaver or a power drill. > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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