Well, looking at your image you have some things that might be working against you: -The shadow of the antennas show they are both mounted in close vertical proximity which isn't ideal. -It appears there is an A/C enclosure near the south-facing dish, and it might provide a reflective face for scattering a signal back to the north-facing dish. -The building to the north looks taller than the one you are on, so this may provide yet another reflection path.
Also, the license shows both paths are operating on vertical polarization, so this isn't helping either. None of this can be reliably modeled with available tools, and the antenna specs aren't necessarily reliable over these very short interference path lengths. The links may appear to be operating normally but in fact have a degraded threshold due to the bucking. This degraded threshold would then make the link more susceptible to interference from other licensed systems that were actually coordinated properly. As I mentioned, when the path in question starts to degrade you could try shutting down the other link to see if the situation improves. If it does, you may need to look into reconfiguring the site to avoid the interference path. For example, mount your dishes on either side of the A/C enclosure so you have the enclosure as a shield between the antennas. Hope this helps, Mike Black Black & Associates 727-773-9016 www.bamicrowave.com -----Original Message----- From: Af [mailto:af-boun...@afmug.com] On Behalf Of Seth Mattinen Sent: Thursday, January 15, 2015 3:32 PM To: af@afmug.com Subject: Re: [AFMUG] Licensed backhaul pricing - still ridiculous On 1/15/15 12:08, Mike Black wrote: > If you look at the "TMCC MEADOWOOD" (WPOQ622) end of that link you will see > that there is a potential bucking situation between two of the college's > Dragonwave systems: Meadowood/Redfield is TX low while Meadowood/Red > Mountain is TX high, with only 100MHz separation. Have they tried shutting > one of these two paths down to see if the issue resolves? The path of redfield-meadowood-red are almost as close to a straight line as you can get without it being intentional. The two opposing antennas on the middle site are back to back. There should be enough front to back isolation on the Radiowaves 3' HP so it's not a problem, correct? Picture attached. ~Seth
