 The system , then known as RDF 1 @.@ 5 , would require a large number of ground @-@ based transmitters to work in an operational setting . Moreover , good reception was only achieved when the target , interceptor , and transmitter were roughly in a line . Due to these limitations , the basic concept was considered unworkable as an operational system , and all effort moved to designs with both the transmitter and receiver in the interceptor aircraft . 
