The Type 1360-A Microwave Oscillator (Figure 1) is a general-purpose test oscillator with a frequency range of 1.7 to 4.1 Gc. In addition to its general usefulness as a microwave signal source, its relatively high output power makes this oscillator particularlyusefulfor attenuation and antenna measurements where detector sensitivity is sometimes a problem. 1.2 DESCRIPTION. 1.2.1 GENERAL. The oscillator in the Type 1360-A is a Type 5836 reflex klystron in a coaxial cavity with a noncontacting tuning plunger. The frequency range of 1.7 to 4.1 Gc is covered in two modes with internal mode switches which operate from the main tuning knob. Aninternal 1-kc RCphase-shiftoscillatorpro-vides square-wave amplitude modulation and linear frequency sweep over a narrow band. The same sweep can also be obtained at the power-line frequency (50 to 60 cps). For square-wave modulation at other frequencies or forpulse modulation, an external modulator must be used. The Type 1217-B Unit Pulse Generator is recommended for pulse and square-wave modulation and the Type 1210-C Unit RC Oscillator is recommended for square-wave modulation. The EXT FM position of the modulator switch permits ac coupling to the repeller for frequency modulation or sweep.