[Tech-Assist] Wind Vs STL's

[jon zecherle]

Hi carl, well I've had this happen to me a few years ago, as I denver it was rectification happening at a ground point on the tower. It appeared that when the line was installed one of the jumpers (ldf) to flex was not tight all weather proofing installed what a treat. After 4 mos. We decided to replace the line with the help of a site master. At this point was it discovered.  Human error. Check all connections that you seem fine chances are this is your problem. Any more questions feel free to call me. 715-579-2549. Hope this will be a help to you. Jon.
On Mar 12, 2012 10:38 AM, "Carl Fletcher" <radiocarl at comcast.net> wrote:

>I need your guys help on this one,  this winter we had a new tower built at one of our FM sites.  The new tower is 500' tall and is located about 15 feet away from the existing tower a 300'. There are 2 FM's located at this site with a third being added when the new tower is finished.

>While the new tower was still being built during strong winds the 2 STL's that where there would mute on and off.  I wrote that one time off thinking that the tower crew had rigging on the tower that was blowing around and causes arcs which would cause RFI and give the STL's problems.  I believe at this point of construction no bays, coax had been installed yet.

>Well since then the tower has been completed,  the third station has been moved there along with it's STL equipment.  Now every time (which is always it seems lately) the winds blow all three of these STL's burp, glitch and mute.  With the help of a spectrum analyzer I was able to see the rf spikes this weekend.  I'm going to have the tower climbed and inspected but what do I have the tower climbers look for ? Is this a guy wire, ground strap, tower joint ?.  A visual inspection shows nothing moving or flapping in the breeze.  Has anyone else had something like this happen or any ideas on what is causing it ?

>The STL's frequencies are from 948 to 950.5 Mhz, all operating from their own receive dish.  All three are receiving RFI when the wind blows.

>All equipment in the building appears perfectly normal (transmitters, tower lights, etc.) except the STL receivers which have nothing in common except location.

>Really pulling my hair out on this one,

>Carl
>WXRD, WZVN