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48V will be less sensitive to induced currents... Eric Rogers wrote: Why can't you bundle the positive and negative DC/AC up with the fiber. I have seen fiber with conductive copper for just that reason. That way the phone companies can power the CPE on FTTH deployments without worrying about the customer's power being out.If you run the conductive wires, use an AC/AC (24v or so for example), then get an AC/DC converter to put at the top, and put everything in an enclosure at the top. ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Travis Johnson Sent: Saturday, January 10, 2009 11:48 AM To: WISPA General List Subject: Re: [WISPA] [isp-wireless] FM radio station site strangeness You run both. CAT5 to carry just the power and fiber to carry the data. We just did this exact thing with our Trango APEX 18ghz radios at our FM repeater. Worked perfectly. (Of course, that radio was made to handle fiber already, so it was pretty easy). Travis Microserv Marlon K. Schafer wrote: Yeah. How do you run poe over the fiber? marlon ----- Original Message ----- From: <[email protected]> <mailto:[email protected]> To: "WISPA General List" <[email protected]> <mailto:[email protected]> Sent: Friday, January 09, 2009 9:21 AM Subject: Re: [WISPA] [isp-wireless] FM radio station site strangeness Is using fiber-optic cable out of the question? Greg On Jan 9, 2009, at 11:28 AM, Marlon K. Schafer wrote: Thanks Mike, The change to 10 meg half doesn't help. In fact, most devices won't connect at all then. The worst part is that the most expensive gear is most effected by this! ug I have installed ferrite beads that do indeed help. Apryl can get you the contact info and part number. 509.982.2181 The shielded cable from Shierene just came in. And I have permission to move to the other side of the building. When the snow melts and the ground firms up I'll rebuild the entire site. The radio station has a new transmitter since I first went into the site and another tenant recently left. I have more location options now than I did before. Yesterday I did some testing with a Fluke DTX. It's a crazy meter. Checks just about everything. As it well should for $7000. Know what it doesn't check very well though? Inductive RF. grrrrr There is one test that showed some problems though. It's called an inductive pulse. Readings at another tower I have (and the tech support guy at Fluke) were 0. This tower had a reading of nearly 3000!!!!! Fluke is supposed to find out what an acceptable level would be and send that info to me. I've not heard from them yet though. The tech's guess was around 30mV. I did think it strange that when I tested my cable with a volt meter (one end to ground, the other to the connectors on the cat5) I was picking up 2 to 3 volts on each pin. That pretty well seems to line up with the 3000mV reading from the fluke! This site has always been a source of grief for me. Must less reliable than nearly any other I have, no matter what equipment is used. I always thought it was due to all of the other operators in the area (one's been fined by the FCC for using illegal amps etc.) doing silly things. Though nothing THAT bad has ever showed up on my analyzer. I always thought it was something that only the customer end could see (couldn't find that on the analyzer either though). Maybe my problem has always been the radio station stuff. Wouldn't that be great? FINALLY, a network reliable enough to allow me to take a vacation. grin laters, marlon ----- Original Message ----- From: "Mike Cowan" <[email protected]> <mailto:[email protected]> To: <[email protected]> <mailto:[email protected]> Sent: Friday, January 09, 2009 1:40 AM Subject: RE: [isp-wireless] FM radio station site strangeness Hi Marlon, It looks like you are on your way to solving this. To get by until then you might want to try locking the Ethernet side to 10MB 1/2 duplex. FM radio runs around 100mhz at high power levels, well so does a 100MB Ethernet connection, it communicates at 10mhz. 10MB 1/2 runs at 66mhz I believe. Fixing it is really black magic however. Sometimes grounding helps, sometimes it is better without. Many have placed the cable in conduit, with mixed success. I would be very interested if the ferits help, we have tried a few with inconclusive results, but have not found a quality unit to test with either. Mike Mike Cowan Wireless Connections A Division of ACC 166 Milan Ave Norwalk, OH 44857 419-660-6100 419-706-7348 Cell 419-668-4077 Fax [email protected] www.wirelessconnections.net -----Original Message----- From: Marlon K. Schafer [mailto:[email protected]] Sent: Wednesday, January 07, 2009 10:47 AM To: [email protected] Cc: [email protected] Subject: [isp-wireless] FM radio station site strangeness Hi All, I think we finally have this all figured out. Now I just have to figure out how to fix it. ___________ The ISP-WIRELESS Discussion List ___________ To Join: mailto:[email protected] To Remove: mailto:[email protected] Archives: http://isp-lists.isp-planet.com/isp-wireless/archives/ To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. Copyright 2007 Jupitermedia Corporation All Rights Reserved. ------------------------------------------------------------------------ -------- WISPA Wants You! 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