Hey Everyone, first post, be gentle. I’m looking forward to being part of this forum.
I’m a farmer in Nth QLD with a passion for AgTech, I have fully automated our irrigation, our Job management, GPS track our workers, automate our timesheets etc etc, but that not what today is about.
I have a bunch of Davis EnviroMonitor Nodes all over the farm connected to things like soil moisture probes, pressure sensors etc, and I’m wanting to boost the radio reception a bit by adding an external antenna. These are the Nodes:
This the Antenna datasheet on the antennas supplied by Davis:
I have used the big 8dbi antenna on my shed roof in the center of the farm that is on the receiving side (that goes to what’s called and IP Gateway that is connected over ethernet to the internet) it is on a 3mtr high tripod ontop of a 12mtr high shed roof.
The nodes all over the farm create a mesh network but each node has a small internal antenna and I’m finding that they can’t quite penetrate through all the trees (its an orchard)
I know that if I were put the nodes high on a post above the trees and each node would have line of sight it would solve my problem but extending the sensor leads on every one of the 4 x sensors per 8 x nodes, plus the cost of the posts and they fact that Hawks/Whistling Kites (birds) will attack them above the trees makes this option prohibitive. Also the trees are mechanically pruned every year so they would need to be taken down every year.
So, that (admittedly) long story brings me to my question. Does anyone have a recommendation for a little 915-928Mhz antenna I could use? Speaking with Liam on the support chat the Pycom one here looks close to what I need.
For $20 I’m happy to try it out and see if it helps at all.
The final requirement is, I’d like to find one that is terminated with a small length of cable/lead with the SMA connector on the end (approx 10-15cm). This way I would not have to drill a hole in the Node casing, compromising the integrity of the IP rated case as the nodes have a hard foam sandwich at the base for the sensor leads to maintain the waterproof rating.
Anyone have any ideas?