I have been using a pair of Xbee PRO XSC 900 for 3+ years and found they worked very well for my application. Unfortunately, one of them was damaged, and needed to be replaced. Since the model I used was discontinued, I purchased the new S3B model as a drop-in replacement. I am able to get the new modules to communicate, but only at close range. Previously, I was getting a range of 2-5 miles - now with the S3B, I only get a range of about 100 yards. According to the literature published, I should be getting more range, not less. What am I doing wrong?
I've updated to the latest firmware, and adjusted my boards to remove the LEDs on the RSSI line. I'm not using sleep mode, and have the power setting to 4 (Highest). I'm using the exact same software and antenna - the only thing that has changed are the Xbee boards. Please advise.