N0JCG
join:2003-07-18
Minneapolis, MN
| reply to TACSPEED
Re: You've got to be kidding me
said by TACSPEED  :
quote:
The key is to keep the intensity of the RFI low enough as to not cause RFI problems with the majority of the people or to interfere in a frequency spectrum that's not occupied.
Exactly! Which is why the 5GHz UNII band is the place for this stuff! 5GHz permits interference management through geography. |
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TACSPEED
Premium
join:2001-04-14
Tacoma, WA
 ·Advanced Stream
| reply to roamer1
quote:
also cables are shileded to minimize interference..power lines are not and therefore will only increase the EMI and RFI they already geneerate
Phone lines aren't shielded, and most likely generate interference too. The key is to keep the intensity of the RFI low enough as to not cause RFI problems with the majority of the people or to interfere in a frequency spectrum that's not occupied.
Also shielding is not perfect, fittings leak and critters chew on the cable. In other words, shielded cables leak RFI too.
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Fiber Optics is the future of high-speed internet access. Stop by the BBR Fiber Optic Forum. |
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roamer1
sticking it out at you
join:2001-03-24
Atlanta, GA
clubs:
| reply to Qumahlin
said by Qumahlin :
Cable and Electricity are two completely separate entities. It is very easy to separate one cable frequency from another and filter the frequencies etc..whereas electricity it is much more difficult
Cable plants are specifically designed to avoid leakage of signal passing through the cables (there are even FCC signal leakage standards that all but the smallest cable systems must meet.) Telephony generally uses twisted pair cables, which help cancel out stray signals. How in the world can one stop signal leakage on open wire, short of lowering transmit power?
Also, given other statements here that BPL uses frequencies between 2 and 80 MHz, in addition to the concerns of hams, BPL systems could very well interfere with licensed users of frequencies in that spectrum (highway patrols, some rural fire/police departments, some utilities, etc. are in the 30-40 MHz range) and could face being shut down if a licensed user complains of interference. 
-SC
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No-Bull SE US Wireless Info: »www.sewireless.info/
Atlanta Apt/Condo Cable & Broadband Info: »www.atlaptcable.info/ |
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TheMadSwede
Premium
join:2001-01-30
Holland, MI
·Charter Pipeline
| reply to RoguePimp
said by RoguePimp :
I agree it is much more difficult to filter the freq fof cable vs electricity but don't tell me we can't figure out a cheap and easy way to do it! I just refuse to believe that we can't figure out a way to do it effectively.
If there was a way to do it cheaply and easily without causing interference, don't you think it would be happening?
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Hey - there's this thing called spell check... |
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hescominsoon
join:2003-02-18
Brunswick, MD | reply to Qumahlin
also cables are shileded to minimize interference..power lines are not and therefore will only increase the EMI and RFI they already geneerate
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God Blesshttp://www.faithwalk.org |
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RoguePimp
join:2001-01-31
Phoenix, AZ | reply to Qumahlin
I agree it is much more difficult to filter the freq fof cable vs electricity but don't tell me we can't figure out a cheap and easy way to do it! I just refuse to believe that we can't figure out a way to do it effectively. |
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Qumahlin
Never Enough Time
Premium,MVM
join:2001-10-05
united state
| reply to RoguePimp
said by RoguePimp :
They are joking right? Who does not have a complaint about BPL? There must be a way to work out the issues at hand. I refuse to believe that with the state of our technology we can't work on a way to avoid interference. I just don't but it that all of the problems can be so bad. After all, I get my High speed cable through the same line as my digital cable in the house and I do not get any interference.
Cable and Electricity are two completely separate entities. It is very easy to separate one cable frequency from another and filter the frequencies etc..whereas electricity it is much more difficult
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Forum Posts:3504 |
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