Is there a way to add a tracking generator to a spectrum analyzer?
From the Quick-Start Guide, p. 43


  
  J8 LO SWP|FAV OUTPUT provides different signals at connector J8: a 0 V to 10 V ramp corresponding to the local oscillator tune ramp, or a
  sweeping dc output of 0.5 V per GHz of tuned frequency (and 0.25 V for
  the 8564E/EC and 8565E/EC). The voltage range of the sweeping dc
  output depends on the spectrum analyzer frequency range. Select the
  output with the softkeys that are accessed when you press AUX CTRL,
  REAR PANEL. The 0.25 V/GHz output is needed for frequency ranges above
  26 GHz. External tracking generators, such as the 85640A, 85644A, or
  85645A use the 0.5 V/GHz output