TGBT14A_912_16 - Q-Band tests of the IF and CR Rack

IFTarget tests

• Using iftarget_tests, configured Q-band to observe 2 lines each in their own VEGAS bank, 40.6 and 43.6 GHz (~3GHz spread)
• This put the IF Rack attenuation at 18dB (giving an output power of ~1V (as expected). The converter rack then was balanced from 25-4dB.
• When only observing at 1 frequency (42.6 GHz), the IF balanced at 19dB (1V), and the converter rack at 10 and 18 dB (2 and 1V for left and right circular respectively).
• When splitting the frequencies in test 1 to 3.5GHz, one attenuator dropped to 2.875dB, suggesting we are approaching the limits of these capabilities, but not there yet. The 6GHz bandwidth possibility may be suspect.