I wonder if anyone remembers OTH solutions used by oil rigs out in the gulf and military. Wonder if tilting antennas might help. I know bouncing off shields or water tanks works...
On Oct 4, 2017 4:18 PM, "Rick Harnish" <[email protected]> wrote: > Steve, > > > > What you are talking about may be related to the Rusty Bolt Effect. > https://en.wikipedia.org/wiki/Rusty_bolt_effect > > > > Rust caused high Passive Intermodulation (PIM). So beware of any rust > (iron) in front of antennas or around it. In LTE, we recommend the > operator install Low-PIM cables between the eNodeB and the antenna ports. > https://community.na.baicells.com/t/baitip-of-the-day-march- > 21st-2017-dont-use-legacy-lmr-cable-with-lte-go-low-pim/281 > > > > I doubt Low-PIM cables would have any effect in reducing the impact of > iron ridden soil, but your post is related enough, I thought I would point > out a few things that may help. > > > > Respectfully, > > > > ---------[image: BaiCells_Tiny3]--------- > > Rick Harnish > > > > Director of WISP Markets > > > > Baicells Technologies North America, Inc. <https://na.baicells.com/> > > Mobile: (972) 922-1443 > > > > [email protected] > > www.facebook.com/baicells > > > > > > *From:* Af [mailto:[email protected]] *On Behalf Of *Steve Jones > *Sent:* Wednesday, October 4, 2017 11:46 AM > *To:* [email protected] > *Subject:* [AFMUG] Iron in the soil and RF > > > > I asked once, never got response. > > I have an area with predictable fading. Performs just like it would > shooting across a metal roof. > > > > a farmer some time back told me the soil in the area has crazy high iron > content when we were dealing with grounding issues after wind farms came in > > > > I have a soil testing company we do contract network management for that > showed a plot 1 miles south with super high levels, they just dont have any > plot samples in the specific area we are looking at > > > > that plot shows 159-480ppm iron where average is 40-50ppm often lower. > > > > reading through ham forums and whatnot there is alot of anecdotal evidence > of mineral content of soil having impact, but no science behind it > > > > as i understand it, the iron is more like rust and rf absobative more than > reflective > > > > the fade patterns match sunrise/sunset patterns (i assume this is more in > relation to the accompanying temp,humidity patterns) > > > > its been like this for the 7 years we have documented in this area, gets > most unmanagable around august through the harvest. > > > > The big question, is there any science behind this to justify soil > sampling in these paths (i have to go out and get a whole bunch of access > permits signed by property owners and there may be a fairly substantial > cost associated depending on the volume of samples) > > > > I have path profiles that show peak reflective are beign in a rough square > mile to affected subs, so that may limit it. I might even be able to offset > some cost by bringing marketing material to the farmers to get their fields > sampled > > > > but its alot of work, i dont know if is worth it, but im completely out of > options and ideas, > > > > one customer has had 11 different radios in 3 different locations across > her property to three different POP locations spanning 5 or 6 different > radio systems on 3 different bands on 6-7 mile LOS nLOS paths depending on > POP > > >
