Bob, Just a quick question here. Are your power feeds Romex/NM, or is everything run in conduit? Would/could that make a difference (i.e. can electrical noise from a device such as a modem/router or its power supply be radiated via the home's AC wiring?)
TNX/73, Al On Sat, 6 Feb 2016 12:03:39 -0600 Bob McGraw K4TAX wrote: > After reading all of this, I investigated my system here. First, no > birdies found on any of the bands. WHEW! Noise on the 160M center fed > wire w/balanced feed line is about S-3 this morning, noise on the coax > fed 75M inverted V is S-2, and noise on the coax fed 40M inverted V is > S-3, and noise on the coax fed 20M inverted V is S-3. These seem to be a > bit higher then normal but it is Saturday and everybody is home in the > neighborhood. > > Our system arrives with fiber underground to the box the TELCO provided > on the end of the house. Out of that box runs a CAT5E cable up the > wall, into the attic, across the attic and drops through the ceiling, > then around the bookcase desk to the modem/switch sitting under the > desk. The modem/switch is a CISCO LinkSys EA4500. Two of the ports > are being used, printer and laptop, and the other two are open. The > power for the modem/switch, power for the computer, the printer, the CLF > lamp on the desk along with the radios all come from one power source > being a dedicated 20A service back to the main breaker panel, again at > the far end of the house, on the inside wall, being the same wall the > CAT5E cable runs up to the attic. The run from the TELCO box to the > station is about 75 ft. Same from the breaker panel to the operating > position for station and amp power. Those feeds are #12-2 w/ ground and > #10-3 w/ground respectively. Being in the middle and upstairs of a 2 > story house there is no station ground to the outside world, other than > the provided safety 3rd pin ground as required. I do have a dedicated > 240V 20A service for the amp and that service is in the attic back to > the main breaker panel. > > Antennas are all above the roof, no more than 50 ft and less with the > tower at the corner of the house, and mostly less with a couple, 40M > wire and 20M wire actually having the ends terminated at the eve of the > 2nd story. The point being, there is not a lot of physical separation > between the CAT5E cable and the antennas and power wiring. > > To me it is very puzzling why so many seem to have issues and a few do > not. I could elaborate about station equipment connectivity. It would > most likely start a controversy as to what is correct and what is > incorrect. My point, if one is having issues, this should trigger a > thought to investigate how and what is configured with the station. In > some cases, I'm sure certain equipment is more prone to generate > noise/birdies than others. > > 73 > Bob, K4TAX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
