KEK visit to Fermilab --- Week 2 - Made Interface Bread Board to allow KEK system to switch the clock phase. After resolving grounding issues, every thing works. - Testing of Demod output from KEK system From KEK Clocking System To (MAB), going to the phase switches protection: -0.6 volts min, 1.2 volts max, 1 nF to ground 1

Testing the Demod Readout of KEK system Magic-T 50 ohm Module eccosorb or Gunn Diode LV biases from MMIC Jig Board KEK clocking system (4Khz and 50 Hz) KEK clocking system (4Khz and 50 Hz) KEK preamps (x100) KEK preamps (x100) Q1 KEK ADC PS voltages Mac Mini 2

Start 4Khz clock End 4 Khz clock no eccosorb Hard to see change in Demod output with and without eccosorb Demod output has small glitches and drifts 3

Gunn Diode ON Gunn Diode OFF Gunn Diode switching ON/OFF makes clear change in Demod Output 4