The 346B Broadband Noise Source has the capability of covering the microwave frequency range up to 18GHz as well as the UHF and IF ranges. It is unnecessary for the 346B to maintain a different noise source for each frequency band. Frequency range: 10MHz to 18GHz Excess noise ratio limits: 14 to 16 dB Power required: 28 ?1 Vdc Manufacturer's Options Option 001 = Type N (male) Connector Option 002 = APC-7 Connector Option 004 = Type N (female) Connector Option H01 = High ENR Noise Source Option H42 = DBS Noise Source