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75.45.110.11
In Reply to: RE: Put the carbon where it does good. posted by Al Sekela on January 24, 2011 at 10:03:22
If RF noise is a problem then it should be dealt with at the source, because RF radiates in all directions not just straight ahead. What is the source and spectral content of the RF noise that you are attempting to suppress?
We're dealing with 60Hz power lines, the impedance of short segments at those frequencies is nil. There isn't much difference in impedance between a power cord and ROMEX at 60Hz unless your power cord is very high end boutique power cord and your ROMEX is extremely long. If your power cord is carrying or radiating RF then so is the ROMEX in the wall.
Follow Ups:
...that has been dealt with extensively on this forum. We're certainly not going to be able to bring you up to speed in a single thread. Search the archives and be prepared to find a great deal of information, speculation, and of course a lot of misdirected hostility from the resident troll population.
I'm fairly well aware of RF and how to deal with it. Heck, I have a book on RFI from the American Radio Relay League that I got sometime back when Ronald Reagan was President. That is why I use and recommend EMI and RFI filtering in numerous applications, including audio and computer projects that I have built.
I'm not questioning the viability of carbon fiber, only the size and placement. A little piece really isn't enough to get the job done, if at all.
You might be surprised.
I can get very good results simply by using a 2" x 1.5" sleeve on any of my plugs. And you can get results with a tiny piece of sleeve around your RCAs. The amount it takes to cover a switch plate is quite enough to hear a difference.
Yes, you are right that placement does matter.
When you say plugs, which plugs are you referring to? Your AC plugs or RCA plugs? I don't call the "receptacles" in the wall a plug, I call them outlets. A plug is attached to the end of a cord. A plug gets inserted into an outlet or receptacle.Even if you do cover an outlet cover with carbon fiber you still have two rather big holes in the middle of the plate. Big leaks.
You cover your switch plates with carbon weave too? The light switch plates higher up on the wall? Or some other switch plates?
I place ferrites over my RCA cables.
Edits: 01/24/11
Yes, I meant the AC plugs of course.
As to the two holes in the outlet cover, you must misunderstand the theory. The CF is not acting as a shield (and shields can have holes, BTW, as long as they are smaller then the wavelength being shielded against). It's acting as an absorber, so its shape is somewhat less important and coverage is not a critical issue, at least not in the way of a shield.
In my case, I use a double thickness of CF inside my outlet cover and a drilled out 1/2" thick piece on the outside. Then CF sleeves on the AC plug barrels as well. This is very very effective.
By all means, it's not the only method I use to control RFI. It's just a good one to use and is synergistic with many others. I'm told it's possible to overdo CF, but not the way it's easy to overdo ERS cloth, which is actually CF fibers with a nickel coating.
I realize you may be sceptical of this tweak. Consider that some of the highest end AC plugs use CF in the barrels, and some of the higher end power strips/conditioners use it on the covers. There's a good reason for this, and it's not about the looks.
Do you have an online source for genuine carbon fiber sleeves? Or flexible film? Most of the flexible film I saw online was not really carbon fiber, it was just a vinyl film with a carbon fiber look/pattern printed on it.
These guys sort of have it all and at good prices.
Yes, there's a lot of carbon "style" stuff out there! It's bogus for our purposes.
I'm not skeptical of carbon fiber weave whatsoever. I am aware that stealth aircraft are made of carbon fiber etc.
I'm only questioning to the point of getting solid answers. I don't want guesses. When designing circuits, you just don't guess. You don't just use whatever capacitor or resistor you happen to have laying around.
Just for the fun of it, I did however place a small piece of carbon fiber weave in my radar range (microwave oven) just to see what if anything might happen.
Edits: 01/24/11
Radar range, damn you are old ! J/K
I'm not that old!
Edits: 01/31/11
Not that old, I just haven't heard that name in a long time, they sure looked good if you were into chrome though , but since I know what it is I sort of dated myself in the process ..... hehehe
My radarange finally gave up 2 years ago...after 28 years of use! Built so well, it dated itself!
For younger readers, it looked like:
How come you didn't fix it?
I still have my first microwave oven which I purchased back in 1989 and it's still working, but not that well. There are no replacement magnetrons available for it. I actually use to repair microwave ovens, worked in a small appliance shop. It's cool knowing how to fix all you own appliances, saves me a lot of money in the long run.
When you don't know how, it seems much more dangerous. So the same place where I bought it diagnosed it, bad/old magnetron tube. I didn't realize until then about a fee to properly dispose of the parts of microwave ovens. It was a lot heavier to get off the shelf than it was when I was 28 years younger! Restaurant build quality.
Bought another Amana because of good luck even tho not built in US anymore. Now it's 1100 watts compared to around 700-800 (don't remember), so much faster in case you're about to pass out from not eating hot food!
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