---------- Original Message ---------------------------------- From: "Kurt Fankhauser" <k...@wavelinc.com> Reply-To: WISPA General List <wireless@wispa.org> Date: Wed, 29 Apr 2009 11:08:45 -0400
>I've seen Ethernet cause problems for the VHF radio band just like this. Try >unplugging the Ethernet and seeing if the noise is still there. You could >also try knocking it down to 10-base T. Apparently the Ethernet signal >generator has a harmonic that resembles the VHF radio band or so I was told. >The old HAM radio guys say that the Linksys brand of switches and routers >are the noisiest. > >Kurt Fankhauser >WAVELINC >P.O. Box 126 >Bucyrus, OH 44820 >419-562-6405 >www.wavelinc.com > > >-----Original Message----- >From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >Behalf Of Steve Barnes >Sent: Wednesday, April 29, 2009 11:02 AM >To: WISPA General List >Subject: [WISPA] Noise by me on a tower > >I have an odd situation, I have 2-2.4 180* sectors MT RB411 and 5-5.8 StarOS >War1 backhaul radios and a RB600 router at the top of a 265ft old AT&T >microwave tower. The top has a grounded NEMA metal box and POE powered by an >Allen Bradley converter. I have an AC and an Ethernet run to the base where >I have a APC UPS. > >The owner just leased space to another client 20 Feet away on same level >from me. It is a local REMC doing meter reading on 221Mhz. They were >having problems with receiving they brought in a spectrum analyzer and there >was a noise floor of -71 at 220Mhz. The tower owner being an radio guy not >a wireless guy just killed power on the ups. (taking down all my stuff and >locking up 1 one of the radios for an hour GRRR) When our equipment was off >the noise floor went to -108. As soon as he powered me back up the noise >returned. They actually said that there was noise from around 150Mhz to >240Mhz. > >Everything is grounded and cased in metal except the LMR that goes to the >Antennas, the AC wire is in flex and the shielded Ethernet down the tower. > >Ideas? there might be a little noise off the oscillators of the War-1 boards >but that's 175Mhz. The Ethernet is 100Mhz, RB411 300Mhz and RB600 266 MHz > >Steve Barnes >RCWiFi Wireless Internet Service > > > >---------------------------------------------------------------------------- >---- >WISPA Wants You! Join today! >http://signup.wispa.org/ >---------------------------------------------------------------------------- >---- > >WISPA Wireless List: wireless@wispa.org > >Subscribe/Unsubscribe: >http://lists.wispa.org/mailman/listinfo/wireless > >Archives: http://lists.wispa.org/pipermail/wireless/ > > > >-------------------------------------------------------------------------------- >WISPA Wants You! Join today! >http://signup.wispa.org/ Yep. Experienced that myself. Scott >-------------------------------------------------------------------------------- > >WISPA Wireless List: wireless@wispa.org > >Subscribe/Unsubscribe: >http://lists.wispa.org/mailman/listinfo/wireless > >Archives: http://lists.wispa.org/pipermail/wireless/ >--- >[This E-mail scanned for viruses by Declude Virus] > > Wireless High Speed Broadband service from Info-Ed, Inc. as low as $30.00/mth. Check out www.info-ed.com/wireless.html for information. -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
