We have an FM station that is giving me fits. Knocking us down to 10mbps on our APs but not our backhauls which are lower. We have added Ferrite beads they helped some. Updated our surge suppression to newer and it helped some, I have loops but not 5. I just tried isolating our ground to see if it helped. It didn’t. So the question I have is how important do you think the bonding of grounds is in eliminating the 10mbps drops? Hell sometimes it drops completely.
I am glad Jay started this post. Jay, if it’s a low power station I think the beads will help. -----Original Message----- From: Af [mailto:[email protected]] On Behalf Of George Skorup Sent: Tuesday, January 23, 2018 2:23 PM To: [email protected] Subject: Re: [AFMUG] ferrite beads / radio station We're on a 17kW Tx/50kW ERP station. I do see some CRC/FCS errors once in a while, but mostly no problems. And some other lower power stations. Under 100W at ~100MHz should be zero issues. There's something else going on. I'd say check grounding, make sure everyone including utility are bonded. On 1/23/2018 1:55 PM, Jay Weekley wrote: > Gotcha. > > [email protected] wrote: >> The coil turns should be all within one inch of each other. >> >> -----Original Message----- From: Jay Weekley >> Sent: Tuesday, January 23, 2018 12:43 PM >> To: [email protected] >> Subject: Re: [AFMUG] ferrite beads / radio station >> >> Sorry for the dumb question. What should be 1 inch in length? >> >> [email protected] wrote: >>> Well, lets say you want the coil to present 10,000 ohms of series >>> inductive reactance. >>> xl=2 pi f l >>> xl/100e6 * 2* pi = l = 16 microhenrys >>> >>> L = R*R*T*T/(9R + 10 L) >>> >>> 8 turns on a 6 inch diameter with a length of 1 inch ought to do it. >>> >>> >>> -----Original Message----- From: Jay Weekley >>> Sent: Tuesday, January 23, 2018 12:26 PM >>> To: [email protected] >>> Subject: Re: [AFMUG] ferrite beads / radio station >>> >>> Chuck, how tight does the coil need to be? >>> >>> [email protected] wrote: >>>> Before the plug on the cable ends. You can also make all CAT5 >>>> cables have about 5 turns of cable as a choke coil at each end too >>>> if you have enough slack. >>>> Shielded cable will help too. No need to ground it. I would focus >>>> on anything near the transmitter and FM transmitting system. >>>> *From:* CBB - Jay Fuller >>>> *Sent:* Tuesday, January 23, 2018 12:07 PM >>>> *To:* [email protected] >>>> *Subject:* [AFMUG] ferrite beads / radio station we are collocated >>>> with a radio station in another town that has been causing our >>>> ethernet speed to drop to 10 meg. >>>> i know we've discussed ferrite beads - - how should they be >>>> replaced on the cable to try to eliminate the noise causing us to >>>> negotiate at 10 meg? >>>> thanks >>>> the station is a low power fm - under 100 watts >>>> >>>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=lin >>>> k&utm_campaign=sig-email&utm_content=emailclient> >>>> Virus-free. www.avg.com >>>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=lin >>>> k&utm_campaign=sig-email&utm_content=emailclient> >>>> >>>> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>> >>> >>> --- >>> This email has been checked for viruses by AVG. >>> http://www.avg.com >>> >>> >> >> >
