Miscellaneous RFI Solutions

Treadmill

Motion Sensors

Baby Monitors

wireless speaker systems and wireless headsets receiving loud pops and crackling

SmartMeter is interfering with our wireless phones

Of course, it is unlikely that all of the problems with household electronics are the fault of the SmartMeter. Radio spectrum pollution is all around us. But the SmartMeter makes a major — and for many people, unexpected — contribution: When it communicates with PG&E, it is sending data from a house to local data-gathering points and back to PG&E central. Many folks, of course, don’t realize that’s happening — until the buzzing starts

go to:  www.elster.com

This is the type REX meter we recently had installed.
per its data communications frequency 902-915mhz UNLICENSED!!!!!
900mhz radio 17.600bps
signals are via a wifi system for the meter to be read/tracked.

http://ftp.rta.nato.int/public/PubFullText/RTO/TR/RTO-TR-IST-050/TR-IST-050-02.pdf

The median noise formula on page 2-15 of this report gives a noise level at 7 MHz of 28 dBuV/m in a 9 kHz bandwidth. Received on a 7 MHz dipole terminated into 50 ohms the noise voltage at the receiver is 41 dBuV in a 9 kHz bandwidth or or about 36 dBuV using an SSB filter. 36 dBuV is 63 uV which is 2 dB over S-9. So, we see that a noise level of S-7 to S-8 is to be expected in an urban environment.

http://www.arrl.org/news/arrl-helps-manufacturer-to-resolve-arc-fault-circuit-interrupter-rfi-problems

Under Counter Lighting RFI

VDSL

I have no personal experience with what you are going through, however, I have spoken with 3 different hams in the past couple of weeks who are experiencing ham radio related issues with the ATT U-Verse package, which is also a VDSL product. In all three cases, the U-Verse package was of the FTTN variety which is fiber to the node and then twisted pair (copper) for the last 2500 feet throughout the neighborhood.

It appears that these FTTN installations are very susceptible to ingress from the HF spectrum between 1.1 – 12 mHz. According to the hams I spoke with, when they were operating on 160 meters through 40 meters, even with RF levels at or below 100 watts, they were severely disrupting nearby U-Verse installations. STB’s crashed, internet and phone connections were dropped, and video was frozen, tiled, or simply went to a black screen.

To date, attempts by ATT to resolve these particular problems have not been successful. Filtering is not really an option since ATT is sending RF between 1.1 – 12 MHz over CAT3, or if you’re lucky, the more interference resistant CAT5 twisted pair. Attempts to filter out RF from the HF spectrum will also filter out the IPTV – internet – phone signals that are supposed to be there. From what I have read in various forums, it has been reported that some U-Verse subscribers are even experiencing ingress by SW broadcasters from the 4 mHz – 11 mHz bands when propagation is really rocking.

transmitter causing the ceiling fan or dimmer control to step through speeds or to brighten or dim the light setting (over-sensitive radio receiver at the fixture, it is a wireless controller).

X-10 devices being unhappy and turning things off and on (same as the problem listed above).

Transmitter triggering the front and side porch motion detector, causing the lights to turn on or to go to bright mode.

smoke detectors – 2. Replace the detectors with a battery operated type (disconnecting them from the AC power). If all of your detectors go off then it is likely that you have the type that signal each other via data on the power line. If one detects smoke then they all go off. It may be that your real RFI problem is only in one unit or that the RF is getting into the signaling data.

Presentation Topic: IS RFI Pollution chasing away the DX?