The 618C SHF Signal Generator covers the frequency range 3.8 to 7.6GHz. Direct-reading dial, ?1% accuracy. Offers internal pulse, squarewave and FM, plus external pulse and FM. Output range is 0 to -127 dBm (0.244 V to 0.1 ?V) into 50-ohms, ?2 dB from 7 to -127 dBm, and ? 3 dB from 0 to -7 dBm.