For example: Agilent E4440A or Anritsu 68369
Sweep Oscillators
Keysight / Agilent 0955-0974
HP Agilent 0955-0974 Noncrystal Controlled YIG Oscillator
Manufacturer: Keysight / Agilent
Keysight / Agilent 5086-7833
HP Agilent Keysight 5086-7833 Oscillator
Manufacturer: Keysight / Agilent