Re: [AFMUG] ferrite beads / radio station
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:af-boun...@afmug.com] On Behalf Of George Skorup Sent: Tuesday, January 23, 2018 2:23 PM To: af@afmug.com 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. > > ch...@wbmfg.com 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: af@afmug.com >> Subject: Re: [AFMUG] ferrite beads / radio station >> >> Sorry for the dumb question. What should be 1 inch in length? >> >> ch...@wbmfg.com 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: 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_source=lin >>>> k_campaign=sig-email_content=emailclient> >>>> Virus-free. www.avg.com >>>> <http://www.avg.com/email-signature?utm_medium=email_source=lin >>>> k_campaign=sig-email_content=emailclient> >>>> >>>> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>> >>> >>> --- >>> This email has been checked for viruses by AVG. >>> http://www.avg.com >>> >>> >> >> >
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. ch...@wbmfg.com 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: af@afmug.com Subject: Re: [AFMUG] ferrite beads / radio station Sorry for the dumb question. What should be 1 inch in length? ch...@wbmfg.com 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: 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_source=link_campaign=sig-email_content=emailclient> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=emailclient> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> --- This email has been checked for viruses by AVG. http://www.avg.com
Re: [AFMUG] ferrite beads / radio station
Gotcha. ch...@wbmfg.com 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: af@afmug.com Subject: Re: [AFMUG] ferrite beads / radio station Sorry for the dumb question. What should be 1 inch in length? ch...@wbmfg.com 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: 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_source=link_campaign=sig-email_content=emailclient> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=emailclient> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> --- This email has been checked for viruses by AVG. http://www.avg.com
Re: [AFMUG] ferrite beads / radio station
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: af@afmug.com Subject: Re: [AFMUG] ferrite beads / radio station Sorry for the dumb question. What should be 1 inch in length? ch...@wbmfg.com 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: 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_source=link_campaign=sig-email_content=emailclient> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=emailclient> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> --- This email has been checked for viruses by AVG. http://www.avg.com
Re: [AFMUG] ferrite beads / radio station
Sorry for the dumb question. What should be 1 inch in length? ch...@wbmfg.com 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: 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_source=link_campaign=sig-email_content=emailclient> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=emailclient> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> --- This email has been checked for viruses by AVG. http://www.avg.com
Re: [AFMUG] ferrite beads / radio station
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_source=link_campaign=sig-email_content=emailclient> > Virus-free. www.avg.com > <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=emailclient> > > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
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_source=link_campaign=sig-email_content=emailclient> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=emailclient> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
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_source=link_campaign=sig-email_content=emailclient> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=emailclient> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
Re: [AFMUG] ferrite beads / radio station
I know it is outdoor shielded , but cat5e. We've been at this site about three years (ok, maybe six). They occasionally move more data than 10 meg and we get alerts gets are congested. I will see if we can add the loops. Where on the cable should the ferrite beads go? - Original Message - From: ch...@wbmfg.com To: af@afmug.com Sent: Tuesday, January 23, 2018 1:12 PM Subject: Re: [AFMUG] ferrite beads / radio station 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
Re: [AFMUG] ferrite beads / radio station
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
[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
