whoa. i just have flashbacks of high school math horror. ----- Original Message ----- From: ch...@wbmfg.com To: af@afmug.com Sent: Tuesday, January 23, 2018 1:33 PM Subject: Re: [AFMUG] ferrite beads / radio station
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: af@afmug.com Subject: Re: [AFMUG] ferrite beads / radio station Chuck, how tight does the coil need to be? ch...@wbmfg.com 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:* af@afmug.com > *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=link&utm_campaign=sig-email&utm_content=emailclient> > Virus-free. www.avg.com > <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
