After shutting off the circuits in my house, it appears that most of the noise is coming from two dimmer switches and a switching power supply. The dimmer switches are for lighting and I'm not sure what the power supply is for. It's plugged into an outlet in my closet and is screwed to the wall. I suspect maybe it's for the jacuzzi tub or the alarm system. I also discovered that with all the power shut off to my house, there is still quite a bit of noise. I guess my neighbors' homes have similar devices installed.
What's the best way to suppress the noise being thrown off by those dimmer switches? I'm guessing that a ferrite choke would take care of the switching power supply. Thanks, Zac KD5IEF K2 4907 On Friday, September 07, 2007, at 09:50AM, "Dave Van Wallaghen" <[EMAIL PROTECTED]> wrote: >Hey Zac, > >That sounds very similar to what my plasma TV emits. I have my window line >running along the outside wall where the TV is mounted and when it is on, I >can hear it very plainly. The tone fluctuates with changes with the picture. >I've also noticed that it peaks at certain frequencies as well. > >I was able to detect it as well when operating portable in my yard 100 ft >away with a separate antenna in a tree. So I know it's not just in the power >line. It is considerably attenuated out there - but there none the less. > >BTW - I have a 50" Panasonic Plasma - beautiful picture and a great RF >generator. > >73, >Dave W8FGU > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:elecraft- >> [EMAIL PROTECTED] On Behalf Of Zac Brown >> Sent: Thursday, September 06, 2007 11:48 PM >> To: Elecraft reflector >> Subject: [Elecraft] Help with noise on 40m >> >> I made a few recordings of some noise that I hear on 40m tonight. The >> .wav files can be downloaded at the address below. I have no idea what's >> causing this noise, or how to filter it out. Is this the type of noise >> that the KDSP2 or KNB2 could remove? >> >> Thanks, >> >> Zac >> KD5IEF >> >> http://homepage.mac.com/zac_brown/FileSharing44.html >> _______________________________________________ >> 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
