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Join Date: Apr 2006
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"e short answer is "No". Any unauthorised modification voids the Certification."
Sparky, perhaps you are forgetting that over the years the FCC has granted dual (and multiple) certification to a number of pieces of equipment, allowing them to be legally sold and used in ham plus marine plus other bands?
Icom's dual ham+marine rigs being among the best known, although there's usually something a little less obvious than a slide switch involved, it is often just a secret button sequence or jumper to change.