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In Reply to: RE: Hilarious. That is NOT proof. The motor may be creating in air RF. Or ... posted by 3+4=5 on March 26, 2017 at 16:47:16
As a long time ham operator , antenna builder and elec tech I know it is. When I plug the chair in via my buddies isolation transformer no problem. Using a simple AM radio as a noise sniffer also proves the noise DOESNT come from the motor but from the crappy switcher. You win jerk of the day! I will be proving this by making a video and posting it on Youtube for you.
Link will be added later. Did you miss the antenna distance from the sources for me and my buddies houses in the OP Einstein ?
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Follow Ups:
30 feet from the antenna is not very far at all, considering how far away the TV transmitter is. A weak TV station might be 30 miles away, and signal strength scales by the inverse of distance squared. According to the FCC, the median effective radiated power for TV transmitters operating in the VHF high band is about 30kW. If you do the math, a 30kW RF source located 30 miles away will have about the same signal strength at the antenna as a 1 milliwatt source 30 feet away. 1mW is pretty noisy, but not unheard of. I've read through data sheets for lighting dimmers where the EIRP spec was stated as <1mW.
Another thing to consider is that AC wiring is not a good carrier of RF. There are problems getting powerline Ethernet to cross from one circuit to another on the same phase, and that's operating 1-2 orders of magnitude lower in frequency than broadcast TV. Finally, the power supply of your TV is designed to filter RF and provide clean DC to the receiver. Any RF present at the wall socket will certainly be heavily attenuated at the output of the supply.
So, one hypothesis is that your noise source is radiating RFI in the VHF band, which is reaching a device specifically designed to collect that energy (your antenna), which is feeding another device that is specifically designed to amplify it (your TV's receiver).
Another hypothesis is that your noise source is feeding VHF frequencies back through its power supply, and over lossy AC cabling, possibly also crossing circuits, and then is getting through your TV's power supply which is specifically designed to be quiet in the TV's reception bands.
The former seems a lot more likely to me. It may not be the right answer, but you are far from proving your hypothesis.
.
Reread your reply and tell me your post was not insulting using terms that you did. So I will put you in the dish it out but can't take it file. But I knew what I was dealing with.....
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Based solely on your first post and your comment:
So in all these cases these devices ruined TV reception via antenna on antennas far from the TV (30ft here, 120 at my friends) thus proving the problem is the AC line was dirtied by these things.
This is not solid proof that your problem is due only to dirtied AC lines. Again, based solely on your original post, there is no proof that the interference is not from the motor or the switching power supplies producing radiated interference over the air vs conducted interference directly through the AC mains. At this point it may be a combination of both, but there is no solid proof that the problem was solely due to 'dirtied AC lines.'
You may have clarified this to some extent in your follow-up post.
dude did you not read that its fine with an iso tramsformer? hello!! anybody home?? arent you an engineer? your bias is clouding your mind on this simple electronics 101 level issue. getting ready to take a video to prove it. youll still probably come up with something wrong with that. of course you knowing me ten years and that im an extra class ham means nothing as you are placing personalities before principles.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Edits: 03/27/17 03/27/17
dude did you not read that its fine with an iso tramsformer?From what I read (and what 3+4=5 read), you did not post anything about an isolation transformer in your first post. You posted that later.
So based on your first post (that 3+4=5 replied to), there was no proof that the interference was caused solely by dirtied AC lines.
Edits: 03/27/17
Excellent and accurate points, Abe.
:)
Not points. Please be perfectionist level critical with me for omitting that because I do strive for that unattainable trait for humans......
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
you responed to the post which mentioned it! I didn't realize i was going to be put on trial here...GD! not to worry, yt video coming soon. Wait till you see the silly noise the USB charger for my smart phone makes. These power supplies are really ruining the AC. Thank God they didn't put the Internet over AC like they considered years ago. See Abe, I'm trying to be nice....I don't like when we fight....lets have make up posts....... : )
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
I don't disagree that switching noise is ruining our AC mains. Just pointing out that your first post was not "proof" as it lacked specific evidence to rule out other causes of your TV station dropout.
In any case, I too am glad that Broadband over Powerlines (BPL) died out here in the US.
Thanks we're good I want to be in mote harmony here. The video is harder to make to my stringent standards but will post when it is up. I made 5 and with my handicap I really need a helper and for my noise sniffing radio would rather have one with an S meter than just turning up the speaker.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
ethernet over AC still exists.
I spent considerable effort isolating RF from power lines using dedicated circuits, aftermarket cords and power conditioners - not freely distribute it throughout the house!
...these devices can be very effective for general purpose use around the home where hard-wired Ethernet is unavailable and Wifi is weak. But I wouldn't use one in my home. I'd crawl on my hands and knees in the crawlspace or attic pulling CAT cable before I'd resort to a power line network adapter!
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