In message 
<31851be7463bd94abee59e88cbd456f5cf6...@esealmw109.eemea.ericsson.se>, 
dated Tue, 8 Jan 2008, Anders Svensson B 
<[email protected]> writes:

>Why do the modules FCC grants have this restrictions?

Probably because co-located transmitters can, and very often do, 
generate intermodulation products at out-of-band frequencies, such as F1 
+ F2 and F1 - F2, also 3rd order products such as 2F1 - F2.

You need to check your product for this effect.
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
For very important information, please turn over.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

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