Monopoles are subject to the vortex shedding problem causing them to oscillate. If the axis of the sway causes the dish to aim high and then low it would do exactly what Jaime is guessing it is doing.
I would suggest mount the antennas lower if possible and/or use smaller dishes. There is plenty of signal. 2’ or 18” would still work just fine at that range. From: Bill Prince Sent: Wednesday, March 04, 2015 10:35 AM To: [email protected] Subject: Re: [AFMUG] Smart guys on lost question I would think the other way. Many guyed towers are not 100% stable in rotation, and running a PTP link from one would likely require torque arrestors. bp <part15sbs{at}gmail{dot}com> On 3/4/2015 8:51 AM, Jaime Solorza wrote: The FCC document they gave me says 21 dBm tx power and that what is set on radios according to guy who hired me to help verify path. One 3 ft dish is on huge guyed tower and another on a monopole with several other drums and a sectors. They experience signal drops during high winds. my guess just from little data giving to me is that monopole is oscillating enough to affect path with signal drops. It is a very windy area and according to their IT guy this is when they see some issues. Link doesn't drop completely but alarms in windy season allot. Jaime Solorza Wireless Systems Architect 915-861-1390 On Wed, Mar 4, 2015 at 9:43 AM, Josh Luthman <[email protected]> wrote: Always listen to the manufacturer. I don't anyone has ever come up with a case where their figure was noticeably off. Certainly never not on the side of caution. Are you using their full tx power or the tx power of the highest modulation? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Wed, Mar 4, 2015 at 11:31 AM, Jaime Solorza <[email protected]> wrote: Hello Smart Dudes on the list: Running a 3.348 mile path for 18 Ghz Dragonwave link to compare what someone else came up with. I am wondering if they used just unfaded free space loss calculation and coming up with a figure 10dB better than mine, I am using unfaded urban area free space loss for mime. I use just free space loss we are within 3db of each other. I added 1 db of cable loss since I do not know if waveguide was used or many other details. I will get all that information on site. I have always engineered paths on conservative side since the start. What are your thoughts Hobson? Thx Jaime Solorza Wireless Systems Architect 915-861-1390
