Xbee Receiver Desentization From Host MCU Noise

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#1
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Does anyone have any interesting anecdotes based on direct experience with Xbee module effective range reduction caused by noise from a host MCU being in close proximity? (I'm experiencing less than stellar performance)

Thanks!

Tom Pappano
Tulsa, Oklahoma

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Never mind, Tom. I mis-read your inquery.

JC

Last Edited: Wed. Mar 7, 2012 - 04:20 AM
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Only thing I can say is avoid chip antennas where possible... The modules with a screw in antenna work much better from my experience.

Otherwise the one project I once used them for worked fine with a 18.432MHz Tiny461 on the motherboard.

You could try lining the insides of your project casing with foil connected to ground around the MCU if it keeps being a problem... Also they do recommend a proper board with proper analog and digital ground planes.

Also there is a huge difference between XBee and XBee-PRO modules. The PRO modules are setup for 18dbm output power, have an external antenna switch, a LNA for RX, and an (adjustable) PA for TX.

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I've used a lot of them, and no issues. Chip antenna on XBee Pro mounted on same PCB as ARM7/72MHz. XBee set to 10mW (not higher, as it capable of, due to international regulations). 2500 ft. range line of sight, with other end being a same radio but with a small Yagi.

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This is a design by someone else that I am testing and trying to get into a useable configuration. The Xbee Pro modules squat directly over a msp430 on a 2-sided board. Range is only about 200' line of sight outdoors using a 1/2 dipole on one end and a 1/4 wave on the other! I will test the module's range with them on a pair of Xbee eval boards (no mcus nearby) and see what happens 8-)

Thanks!

Tom Pappano
Tulsa, Oklahoma