The Reich never had any FM equipment deployed, altho according to the Fritz Trenkle book, i believe it was, FM equipment was "under development". But the Reich had bigger problems than having the latest radio gear. AM equipment in US tanks was prewar and early war, wasn't it? The USA barely used the No.19 type equipment, i gather only in vehicles to liaison with UK vehicles. Nobody  repeat nobody, had a packset as advanced as the BC-1000 of SCR-300.