I did this mod last night. I did not notice much if any difference. I have to try the screwdriver on the transistor test Don told me about.
Since they fixed the streetlight, I don't have much noise, but have found noise that sounds very like ignition noise from a car, with no impact from the NB on it. No big deal, since I don't have a lot of noise (now). Brett N2DTS ----- Original Message ----- From: "Joe Planisky" <[email protected]> To: "Brett Gazdzinski" <[email protected]> Cc: <[email protected]> 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 to have > little to no effect on the noise. In fact, I questioned whether it was > working at all. A 'scrape test' (connecting a wire to the antenna > connector and scraping it on some metal surface in the shack to generate > static) indicated that it was indeed working. > > The modification described here > > http://www.dl7maj.de/KNB2-Mod.pdf > > seemed to improve the situation. After making the mod described, the > KNB2 would partially take out the electric fence noise using the LEVEL > LOW threshold. Not perfect, but better than it was. > > You can read the original thread by searching the list archives for the > topic "[K2] KNB2 vs. electric fence" that started on August 3, 2008. > > 73 > -- > Joe KB8AP > > > On Mar 1, 2009, at 2:18 PM, Brett Gazdzinski wrote: > >> 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 before I got the noise blanker. >> >> The main reason I asked was there seems to be no degradation of signals >> with >> the NB on at any setting. >> On most rigs, you can hear a difference, and where its adjustable, it >> makes >> things sound really bad when you turn it up. The pro 3 is like that. >> >> On the K2, I have been unable to detect it doing anything at all, any >> mode, >> any noise, although the noise level I usually have is not bad. >> >> Thanks for the replies, >> Brett >> N2DTS >> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
