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 Fibre to the home / cabinet - mutual interference
Currently I have regular ADSL+ which gives me about 10Mbs - but is prone to interference from 160 / 80 Mtr transmissions to the extent I can kill it completely much above 20 watts output. This is despite much line filtering etc on the modem.
I now hear we're going to be getting fibre to the cabinet offering greatly enhanced speeds - so far so good.
However my fear is that FTTC is going to be prone to even more interference from 80 Mtrs and above due to the higher bandwidth being sent along the final bit of copper.
Does anyone have any experience of EMC problems with FTTC and HF signals ?
73 Tim KT6UK / G4WIM
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No experience with FTTC here. We have had fiber to the local "drop box" - short run of cable to the modem in the house - for many years. Zero RFI on all bands at high power. In general fiber systems are much less bothered by RF than copper.
One would hope that you will benefit from less copper in the FTTC system. Good luck!
73,
Bill, WA8FOZ
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Hi Bill,
was your short run of cable coaxial or twisted pair ?
I expect final bit of cable will be copper twisted pair - which unless it's perfectly balanced could be prone to RFI :-(
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Verizon FiOS here.
Fiber run directly to the house, interface box is mounted to the outside garage wall. From the box, it's copper (Cat-5e or Cat-6) to the phone lines and the Internet router. About a 45 foot run for both.
I've run up to a KW on every band from 160m to 10m. Nothing to report. Just keeps running.
"If someone tells you he believes in and talks to an invisible bunny named Harvey, you put him on medication and a regimen of therapy. If someone tells you he believes in and talks to God, well, that's perfectly acceptable. Why that's the case is impossible for me to fathom." - WP2XX
"He's dead, Jim. You take his Tricorder and I'll get his wallet."
"The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?"
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I can only dream of fibre to the house which would expect to be fairly immune :-)
Unfortunately looks like at my UK QTH we're getting fibre to the cabinet then a couple of hundred yards of copper strung on poles acting as a nice HF 'antenna' just waiting for my signals to block it out. Time will tell, let's hope I'm wrong...
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I have had "fiber to the brick" for over 5-years. No problems on any band that I operate which is all bands from 1.8 MHz through 432 MHz (including 222 MHz). Output on 160-meters is slightly over 800 watts (the power transformer for my home brew linear is a little on the small size), power output on 80-meters through 10-meters is around 1400 watts, around 100-watts on 6-meters and 2-meters, around 50-watts on 222 MHz, and around 175-watts on 432 MHz. I run primarily SSB and CW.
One of my 3-computers is at my main operating position and no problems at all. No problems on the other 2-computers. Also, I don't have any problems with the amplified computer speakers and haven't added anything, including ferrite, to them.
Glen, K9STH
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Same story here. I've had fiber-to-the-house for about 3 years and zero RFI problems.
73,
Bill
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The length of copper from fiber-to-house is likely so short that 160 and 80 are not going to bother it, the "antenna" is too short.
73
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WD:
At least in my situation, the length of copper wire between the conversion box and the fiber is zero! It will be the same for any "fiber to the brick". All copper is on the "house" side which is Category 3 for the telephone and Category 5e for the Internet and television.
There are numerous systems in which conversion boxes are mounted on the utility pole and then there is copper from the pole onward. Also, there are numerous systems which utilize copper lines from a major distribution point in the neighborhood in which the copper may be up to a mile in length. Those systems are much more likely to have problems with r.f. from transmitters.
Glen, K9STH
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was your short run of cable coaxial or twisted pair ?
Coaxial. And I watched them attach the connectors when it was installed!
The length of copper from fiber-to-house is likely so short that 160 and 80 are not going to bother it, the "antenna" is too short.
Generally in most installations this is the case.. But mine is about 70 feet long. And no problems.
We have cable and broadband but not telephone on this system. The Time Warner telephone modem used around here is notoriously sensitive to RF, and hams have learned to avoid it.
73,
Bill, WA8FOZ
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