Join Date: Apr 2006
Thanked 156 Times in 153 Posts
Rep Power: 12
"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.