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868MHz Propagation problem
dgleeson422111 wrote:
Hello All We have a propagation issue that is confusing us. We have two 868MHz modules on test, each capable of 500mW transmission. We are testing to find the range of communication. We are testing them as follows. One remains in our office while the other is taken to the street outside. we are communicating charecter strings such as "Im at the lamp post number 1" etc. There is somebody at each end sending text strings in a continuous conversation. There is no protocol, error checking or error recovery. What we have repetadly found is that the radio in the office can receive long after the radio in the street has stopped receiving. (The person with the radio in the street is moving away from the office.) I see you have other responses. One test that would establish that is environmental (adjacent signal, receiver desense, etc), if BOTH units could be moved to a relative RF free environment such as a rural setting and then test the range. If this eliminates the problem, then its probably time to break out a spectrum analyzer and take a look at what is around your operating frequency. Andy |
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