i am working on one project which capture data at remote site and send it to central room. for that purpose i choose XBEE S2 in first stage. my circuit contain two section TX and RX. Each side i use micro controller for process data before use. i just want to remove wire and make it wireless.
my problem is that…
after making my circuit i test range of XBEE S2 and i got near by range as per datasheet. but it is not enough in my project so i decide to use pro module. So i purchase XBEE PRO S2B for long range. after configuration of pro xbee when i attach it with circuit instead of XBEE S2. i am getting signal from one xbee pro sb2 to another xbee pro sb2. but when i test its range its 1/4 of XBEE S2. i can’t understand why its happen. i already test some problem reason such as…
i provide proper power to xbee pro s2b from 1 amp. SMPS followed by 3.3v voltage regulator.
i already select PL value as “4” which is highest among all.
Antenna type? On PCB or external via U.FL connector?
Range improvement is best improved with use of as much antenna gain as you can afford for antenna size. Lots of choices in antennas.
Be sure that software does not undo your choice of power level 4 (high).
I’ve not used XB S2, but XBee S1 Pro, with a PCB antenna on one and a 5.6dBi gain omni on the other, I routinely get many 100’s of feet of line of sight range. A 1/4 mile with better antennas.
The XBee S1 Pro are about 60mW transmitter power. I don’t know what the S2 “pro” are. The S1 and S2 are vastly different chipsets and S2 is Zigbee only.
Also, make sure they are some distance before being turned on to establish a network. The coordinator needs to scan the RF channels for a clear one then the remotes find the channel the coordinator is using. If the units are too close to each other then the remote will ‘hear’ the coordinate on an adjacent channel which is incorrect and will not have the expected range.
My XBEE PRO S2B have wire antenna factory fitted. and in datasheet no any specification of antenna is mention where range of module is written.
range is so dependent on obstructions, antenna type, elevation, etc.
The XBee S2 , page 8, says the North American S2 modules are about 60mW and International ones are 10mW. (this is due to other countries’ regulations on the ‘emissions mask’).
If yours are able to run 60mW, and with line of sight conditions, and with the power programmed to max, you should easily get 100’s of ft. range even with just the wire antennas. Much more if one or both ends have radios with the U.FL connector and a gain antenna.
Be sure that some software, e.g., ZigBee, is not overruling your XCTU setting for power. And that using XCTU, of course you must write the changes back to flash memory.
It could also be that your problem is not tx power, but some sort of ZigBee faux paus in routing.
I prefer the S1’s (which don’t use Zigbee, but optionally can use Digimesh) for simple networks.
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