Scott, A few questions.
What power are you running up the tower, 120VAC? Need to know make and model on the Tsunami. Are they losing the link on both sides or just one? Your cable may be inducing something onto their cable that is screwing with the radio's conversion freq if its a two piece radio like a Tsunami 45 or Tsunami 100. Did an AM RF engineering firm review your proposed install? Let me know what cha got... Bob Sent from my Verizon Wireless 4G LTE Smartphone -------- Original message -------- From: Scott Carullo <[email protected]> Date: 05/13/2013 10:10 PM (GMT-05:00) To: [email protected] Subject: [WISPA] Electrical noise problem / need solution I'll try to keep this as brief as possible while providing pertinent info - thanks if you reply FM tower with AM detuner skirt from 0-150ft - fm tower has isolated guy wires and is well grounded at base AM tower ~60 yards away operating at 50KW with 4 arrays max We did new install there and ran power wire up tower in non-shielded SOOW 14/3 wire to 325ft from inside building at base Right after it was pulled up tower I happened to be running the bottom into the building and got shocked, not just by the cable but by about everything around me. Not fun, RF burn is something you don't want to experience lol. Its unbelievable really, watch this short video from my phone - you can hear the am station coming out of the arc welder like sparks. http://flhsi.com/files/wow.mov Remember, this cable is not powered up its just hanging there... Gives you something to think about. So obviously I decided it was best not to hook it up to the equipment at 325ft or the power UPS at the bottom. I looked for a solution and ended up buying replacement power cable called Armor-X which is fully armored / shielded 14/3 power cable. Actually really nice stuff it looks like 1/2 inch coax from the outside almost exactly. I used coax grounding kits about every 50ft up the tower and one at top where enters my stainless box and one where it enters the building on the common ground plate. I also ran the cable up the inside of the tower instead of the outside - a seasoned engineer told me running it inside the tower would provide shielding as well from the AM station. This fixed my AM issues and allowed me to successfully power the equipment without issue. Next problem - Another customer at the tower lost link on their 5Ghz when I powered up the new cable. They are using an older tsunami radio with coax up the tower to their antenna. I believe that our power cable is located about 6 - 12 inches from their coax the whole run up to 325ft (not positive though - I have not been back to find out yet). I need to not have their tsunami get noise on the coax and drop the RF chains and lose link. When I unplug the power to my cable their radio link comes up / plug in theirs goes down in minute or so. Repeatable. Not an RF issue we turned all transmitters off - its just the power cable causing the issue. Since I have it bonded well I'm not sure how to rectify this. I need to deal with this soon. Any ideas would be very appreciated. Thanks for your time. Scott Carullo Technical Operations 855-FLSPEED x102
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