[Repeater-Builder] Legal radios for a repeater

[terry dalpoas]

I was asked the other day by a friend if you could use an older mobile (Micor, 
Mitrek, Mastr II and Exec) that has been duplexed for a repeater in GMRS, 
public safety, etc.  I told them that I was pretty sure it was legal since the 
transmitters are FCC type accepted and as long as they transmit a clean signal. 
 Was I correct on this?