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11-13 of 13 messages
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Page 2 of 2
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RE: Help on a Los Angeles area RDF?
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by KG6YTZ on September 10, 2007
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Mail this to a friend!
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WB6BYU said:
"One solution is to move your antenna to the other side of the room"
The other side of THIS room? Not practical, and not a good idea either. :-) The dipole is on THAT wall [west] because over here on the other side of the room, along THIS wall [east], is a TV, a cable box, a telephone, and the computer system [including a printer and a pair of amplified speakers]. My cell phone's desktop charger is also nearby. And, directly on the other side of this wall, there's the entertainment center in the living room, with its own stacks of equipment - TV, cable box, VCR, DVD player, EQ, and a somewhat cheap stereo which doesn't reject interference very well. No, moving the dipole to THIS wall would put an awful lot of equipment well within one to two wavelengths of the antenna.
Yeah. Bad idea. :->
Actually, it's really not all that much of a problem now anyway, since I got permission to put a J-pole on the roof back in April, so the setup in the kitchen has become my "main" shack, and the bedroom is now just a "secondary" shack and seldom used except for listening.
I'd still like to know what's radiating next door, though... Maybe one of these years I'll get a chance to find out.
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RE: Help on a Los Angeles area RDF?
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Reply
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by N6JSX on October 28, 2007
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Mail this to a friend!
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Here is another culprit RFI problem. When I lived in Rowland Hts (in my T Hunting hay-day's when I regularly beat some of the BEST like KF6GQ/K0OV/WB6JPI/N6MI/WB6ADC/WA6FAT/etc). I found I had a broad pulsating broad noise across 145 to 147 MHz.
I RDF'ed it down to a Church on the corner of Colima Rd. and Otterbein Rd. It was found to be a "rodent repealer" the pulsing was in sync with the oscillator LED on the device. We unplugged it and the noise went away (at that location). I lived about 1200' crow-flight from the Church. There was no part 15, or model/manufactures name on the device - but they were hot sellers in the 80's at National Lumber/Oles/84 Lumber/Home Depot.
The only thing we could figure is the oscillator was so poorly decoupled from the AC input power that it back fed into the Church electrical AC wiring making the whole church an antenna.
I thought I had it nailed as the church threw the device into the trash. But hark not so fast, I had another one even closer and on the same bearing to the church. It was in the trailer court behind my house. I soon found the trailer and knocked on the door. I let them hear the noise and then asked them to pull the device plug - magically the HT went silent - their mouth went agape. But they did not want to leave it unplugged as they feared mice (doubt this damn thing scared mice/roaches away but they believed the advertising).
I had to think fast - well I really created a whopper to scare them from plugging it in. WE lived directly under the LAX final approach pattern (we often watched the planes lining up and go over our house). Now they are still at 10K feet but I just told them that this noise might interfere with a planes navigational system. If any plane ever crashed due to this I'd be sure to tell the FCC of my findings. It worked they unplugged it. I know and you know this would never happen - but what's a white lie to get my 2m's cleaned up.
I info'ed the local FCC about this device - but they said they could do nothing, more like they were to busy to care - hell it's only HAM radio, what are we?
*************************
I had a cable TV RFI noise problem in my home town of Manitowoc, WI. The cable company would do nothing about cleaning up their RFI problems on the HAM bands.
Well where RF gets out RF can get into the system. I setup a packet BBS and put it into beacon mode every 60 seconds on an obscure packet frequency. Every time my 5W HT (using a TV Twin J) TX'ed it took out cable channel 18 for +6 block radius - this channel had the "Lawrence Welk Show" (Geritol types in my home town must get their fix of Welk weekly or else)- it didn't take long before the cable company was getting complaints up the whazoo. Soon the Welk show was changed to another channel, my letter got the FCC to eventually do a fly over (this is the one time being the WI OOC may have helped get FCC action), and Jones Inter-cable was fined a few $K's. It got fixed but it took over a year to get it done.
Ya got to do - what ya got to do....
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