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
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