Scott, I would isolate the internal house data equipment on a surge protector / filter AC power box. This will ally some of the conducted power line issues you ask about. I'd then get online at the problem time and shut off each of the house breakers one at a time while seeing if the data cleared up after each breaker is turned off. This way you are isolating each 115VAC circuit in your house. IF/THEN If this doesn't find it; (the offending circuit / hardware), it just maybe external to your house but close by. A neighbors hardware? Also it could be between the tree and that mountain top repeater, where data could be bothered but a ping of that path would get through? Trees grow and miss-align antenna paths after a few years. I'd check the aim of the RF path also.
Good luck, Michael Sundstrom OHD TREQ Dallas Electronic Lab Analyst EMC Lead (214) 579 6312 office (940) 390 3644 cell KB5UKT -----Original Message----- From: Scott Douglas [mailto:[email protected]] Sent: Saturday, February 25, 2012 3:19 PM To: [email protected] Subject: [PSES] Wireless Telephone and Wireless Internet Clash - Follow-up #1 First follow-up to the original post. Let me thank everyone for their interesting responses so far. As always an education. I can tell you it is NOT the 900 MHz wireless phones. We disconnected both of them from AC Mains and telco. We also turned off the outside motion sensing lights. Neither one solved the problem. We have one digital timer that turns on a light about 5 pm and off about 11 pm. This light is a CFL. We are going to replace it today with an incandescent to see if that helps. We have two other CFL in the kitchen but they aren't used very often. We also have another digital timer that turns on an incandescent light at random times. It is usually manually turned off when somebody gets home from work in the evening. So two more tests would be to replace the other two CFL just to be sure and to remove the digital timers. We can think of no other time dependent gizmos that operate only during the 6-10 pm window in our house. There are things that maybe could cause the issue, but they are just as likely to operate at other times as during the problem time. Does anybody think this could be a conducted EMI issue (on the AC Mains getting through the little wall-warts that power either the router or radio)? Or does it seem more likely a to be a radiated issue, as in messing with the modulated RF between our radio and the access point? Or maybe radiated into some cabling or wiring in the house? Still trying to narrow the mechanism down. Somebody asked why is the antenna in the tree. The AP is down by the lake, maybe 150-200 feet lower elevation. And there are hills and tons of trees between us. The ISP brought a bucket truck to move the antenna around and see where he could get the best signal. And it was not from on or around the house. We have seen no power issues on the radio at any time of the year (except when we have ice storms). The AP relays to the main system antennas on top of a local "mountain". An ice storm in January 2011 coated the main system antennas with 6 inches of ice. The tower was so coated it was too dangerous to climb so we had to wait until they melted. Otherwise weather has not been an issue. I am not aware of any local radio operators within a mile of our house. There are some dish users that may have communications over the power lines, but they are at least a distribution transformer or two away from us. The saga continues. Scott - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
