Weather Station Hardware > Remote Weather Monitoring

Issues transmitting data, ideas for data transfer other then cell modem

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geofb13:
So I've been brought in to help with a system of stations that are already in place south of Montreal. It's a system of let's say roughly 15 stations that are currently set up to transmit via a cell modem to the servers. However, cell signal at some of these locations is shoddy at best and I'm not sure the modems and antenna are really the best. From my experience with two other systems cell modems seem to be the norm but I was wondering if anyone who deals with these if there's something better out there that won't break the bank.

Any ideas would be great as the guys who have hired me want to try RF transmitting via 900Mhz so that we can create a mesh network between the stations in case one station is more of a liability then others transmitting at certain times or during certain weather events.

SLOweather:
More data would be great. What kind of antennas? Indoor? Outdoor? Omni? Beam?  Feedline? How old is that infrastructure? Got a map or lat and lons? Site photos? Got modem make and model number?

geofb13:
Sorry SLOweather for the lack of info, most of it is because I was just literally dropped on this project and I've had one day of maybe 4 hours to look over some simple tests so far. I'll try to answer some of the questions as best as I can. The stations that are in use are the Spectrum Watchdog 2000 series with a mix of Full and Mini stations in the network.

Antennas? etc. -- Didn't really have a good look at them other then whomever set up the stations has them attached to the inside of the box that holds the modem, battery, COM board, and regulator for the battery and solar hook-up. From what I've looked over on the Spectrum website and documentation that seems to be a normal practice with this model/version.

It's at least 5 years old as the documentation that seems to be on the Spectrum website now does not include a a modem like the one's that are in this system. I'm not one hundred percent sure but I believe it's GPRS but obviously not the one they are selling to folks now, and not the ones that I've seen that are were sent to replace old ones in the current units. The new ones are bi-directional but that would have me assume that the old ones are not if they're also promoting that.

Here are the lat/lon for the area covered, mainly farm land except for clusters of homes or buildings in the small towns or farm centers that sprinkle the area. Lats run from 4519'48.48"N down to 456'32.34"N and Lon runs from 7341'50.00"W to 7321'06.04"W roughly. I don't have any photos of the sites but I do have their locations roughly approximated with their lat and lons.

Sorry that I wasn't able to answer more of the questions, I should be working on it more this week hopefully so I'll try to grab photos and other information when I can.

As for now, it looks like they want to as I mentioned before use RF but this has only been tested by one of the Agro-scientists north of where we are using a Raspberry Pi Model B, two Xbee Pro 900 RPSMA modules linked by two 900MHz 2dBi Duck antennas. That however, is not connecting more then one station and at the Raspberry Pi's end it goes straight through that farms network to the server. That might end up being the best option for some of these locations but others are farther away from the growers produce buildings.

I hope this helps a bit more. And thanks for the help so far!

Beaudog:
I do not know anything about the equipment you are using. But it sounds like there is power at each site and maybe some type of modem.

Something like this could be put at each location and transmit to a central location and then upload using a regular internet access.

http://www.ubnt.com/airmax/nanostationm/

geofb13:
Thanks for replying Beaudog. I don't know if I saw those on another thread that you've posted on or not, but at the moment those are out of the price range if I remember the prices correctly.

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