Found some modification info for the 718 on amphone.net. i don't have one of these radios, but it is on the list.
https://www.google.com/url?sa=t&rct...attach=40813&usg=AOvVaw0L7V8du1lUBssrmCZ3kFbO
https://www.google.com/url?sa=t&rct...attach=40813&usg=AOvVaw0L7V8du1lUBssrmCZ3kFbO