Shireen cable is DC-2022 we used.. Jaime Solorza
On Fri, Jul 20, 2018, 9:42 PM Forrest Christian (List Account) < [email protected]> wrote: > My guess is that it is likely easier to do the right thing with the > liquidtight conduit. > > In a high rf environment one of the best things you can do is to create a > faraday cage consisting of the metal enclosure, the shield around the cat5 > cable and the radio shielding/metal enclosure. If the shield is > continuous, then the rf signal won't be able to enter the twisted pairs > themselves. > > In a shielded cat5 environment, you have to take care that the shield > itself is terminated at the entry of the metal enclosure. This is either > accomplished though stripping the shield back and connecting it directly to > a metal clamp of some sort at the entry point, or some sort of grounded > shieled waterproof feedthrough coupler. > > If you use a metal conduit all the way from the box to the radio, this > faraday cage will largely be automatically generated, especially if the > radio is in a metal enclosure such as a 450i. Even if the radio isn't in > a metal enclosure, as long as the gap is very small, you'll end up with > much of the same benefits. > > If you are using a metal enclosure for your electronics, one of the worst > things you can do is to bring the shields inside the metal enclosure > without grounding them at the entry point. The shields can become little > reradiating antennas inside the enclosure if you don't ground them at the > entry point. > > My preference at high rf sites is to ground the shield at a metal > enclosure, and use unshielded cable inside the enclosure. Adding a > ferrite bead just inside the enclosure can help to filter out any remaining > rf. > > On Fri, Jul 20, 2018, 7:35 PM Nate Burke <[email protected]> wrote: > >> I'm curious why Liquidtight works when the foil shield on the Cat5 >> doesn't. Extra distance from the twists? Heavier gauge steel? Do you >> need to make sure the liquid tight is grounded, or just the fact that it's >> around the cat5 is enough? >> >> On 7/20/2018 7:04 PM, Chuck McCown wrote: >> >> Yeah, that too. Some folks could not make it work without the >> liquidtight. >> >> *From:* Sean Heskett >> *Sent:* Friday, July 20, 2018 5:38 PM >> *To:* AnimalFarm Microwave Users Group >> *Subject:* Re: [AFMUG] Ethernet problems next to FM Antenna >> >> Put all Ethernet cables inside shielded liquidtight flex conduit. You >> can buy it st an electrical supply shop. >> >> Be sure to run the conduit to a metal box at the top and then breakout to >> each ap in smaller shielded conduit. >> >> -sean >> >> >> On Fri, Jul 20, 2018 at 10:35 AM Nate Burke <[email protected]> wrote: >> >>> It looks like the old archives aren't back online yet, so I couldn't go >>> searching through there for ideas. >>> >>> I have a site where we have been co-locating with a 800w FM Transmitter >>> for years. We've always had Ethernet problems at the site since the FM >>> went in. Everything is shielded cat5 (Belden 7919). It is at a grain >>> elevator, our equipment is on one corner of the platform, and the FM >>> Transmitter is on the other corner. We are horizontally separated by >>> about 10 feet. There is no way to get vertical separation. I used to >>> run all the cables down to the bottom of the leg, about 100'. In an >>> effort to make the Ethernet work better, I installed an Edgepoint fed >>> with Fiber at the top, so cable lengths between the radios and the >>> Edgepoint are now 5'-10'. With the FM Transmitter turned off, everything >>> runs perfectly. When the FM is turned on, most equipment drops to >>> 100mb, and some goes down to 10mb. On the most problematic equipment, I >>> have installed the 4 pair FM Filters from Sandman >>> http://www.sandman.com/rf.html within 12" of both the switch and the >>> radio. It made no change. >>> >>> What FM Elimination tricks have I forgotten to try? I was really >>> expecting the short cable lengths to solve the problem. >>> >>> -- >>> AF mailing list >>> [email protected] >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >> ------------------------------ >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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