Matt, Well, then that source of this RFI is ruled out. Ice maker is off and I don't think it has been on in years -- it may not even work anymore. About the only time we might need ice is when we have a party of some sort (which is also rare) that needs ice and we just buy a bag down at the corner market.
phil K7PEH On Feb 19, 2014, at 11:25 AM, Matt Zilmer <mzil...@roadrunner.com> wrote: > One of the items that many overlook is in-freezer ice makers. They > can make a lot of broadband noise when the heater is running. Yes - > heater. Once the ice cubes are frozen they need to be ejected. In > order to do this smoothly, the "tray" is heated up just enough to let > the cubes pop loose. The heaters I've seen (and heard) use a type of > PWM applied to a heating element, and the PWM creates broadband RFI. > The heater is usually on for 1-2 minutes, but that probably varies by > manufacturer. > > 73, > matt W6NIA > > On Wed, 19 Feb 2014 13:29:22 -0500, you wrote: > >> I get this type of noise when my wife uses a laminator. >> I also get a lot of sporadic noise in the morning around the time people get >> up which I assume are hair driers and curling irons. >> It really could be anything, but probably something one of your neighbors >> has. >> Good luck finding it, if it continues. >> 73- Tom - wa4ta >> >> >>> From: phys...@mac.com >>> Date: Wed, 19 Feb 2014 10:15:42 -0800 >>> To: Elecraft@mailman.qth.net >>> Subject: [Elecraft] Noise, RFI ? >>> >>> Using my K3 I was trying to pick up a ZL2 station (New Zealand) around >>> 18.08 MHz this morning (about 9:50 AM PST) when this huge noise blanketed >>> everything out. It was about 30/9 and absolutely solid across the spectrum >>> shown on the P3. Using my KPA500, I switched to the 20 meter band -- same >>> noise, same level, same broadband impact. >>> >>> I determined that the noise was from roughly 1400 KHz all the way up to >>> 28.05 MHz. All about 30/9. About the time that I finished checking this >>> full MF/HF spectrum of noise it switched off. >>> >>> Then, it switched on, and stayed on for about 5 seconds, then off again. I >>> turned on my Icom R75. The next time the noise came on I checked it with >>> the R75 and the same noise, same 30/9 level, same broad across the bands. >>> >>> Obviously man-made or under man control as it switched on and off and was >>> on for various periods of time. This noise seems to be close, like >>> generated in the neighborhood someplace. >>> >>> Anyone have ideas of the cause. You noise experts (Jim?) should have >>> ideas. I was thinking maybe an arc welding machine but that is just a wild >>> guess. It sure seems to be something that can be switched on and off. It >>> is not periodic in that the on/off switching is at varying intervals. The >>> longest on period is about one minute, the shortest on period about 2 >>> seconds. And, it has been quiet for the last 10 minutes or so. >>> >>> Thanks for your help. >>> >>> 73, phil, K7PEH >>> ______________________________________________________________ >>> 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 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 > Matt Zilmer, W6NIA > -- > "Give me six hours to chop down a tree and I will > spend the first four sharpening the axe." -A. Lincoln > ______________________________________________________________ > 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 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
