As far as a RF speech compressor even the older MP's were what we used to call Meat Grinders to cut threw pile ups but just look at the by products, these older designs had lots of RF hash on both sides of the signal, just look at 20m during a Sunday afternoon and when an OP will state what he is using then look at his spectrum profile and I would bet its an older radio plus allot of these older rigs will overload on the RX side very easy against newer radio designs.