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