Find out the exact frequency of the FM transmitter. Be sure none of your cable lengths are a multiple of the frequency and end up as an antenna. They can also cross a harmonic and pick up noise as well. The radio engineer for the FM site can tell you what lengths NOT to make your cables. A 12” difference in a cable length could make a world of difference in noise.
Not sure if this is the issue but I have had this issue before where one of the cables was acting as an antenna. Jim From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Marco Coelho Sent: Thursday, July 14, 2016 3:19 PM To: WISPA General List <wireless@wispa.org> Subject: [WISPA] FM Radio interference I have an existing tower that has a FM transmitter on it. I believe they are just under 10,000 Watts. Since we have been one that tower, I could never link up Ethernet that runs up the tower to the equipment on the bottom at 100BT. I've tried ferrite rings on both ends, all cables are shielded and grounded. Always had to go to 10BT to get a link. I moved our radios 35 feet away from the bottom their antennas and still cannot link at 100BT. The new radios require 1000BT too use them to full advantage. Ideas? I'm considering conduit all the way up the tower. I don't want to put switches at the top. -- Marco C. Coelho Argon Technologies Inc. POB 875 Greenville, TX 75403-0875 903-455-5036
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