1

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 KEKClockingSystem

To (MAB), going tothe phase switches

protection: -0.6 volts min, 1.2 volts max, 1 nF to ground

2

Testing the Demod Readout of KEK system

Magic-T50 ohm Module

eccosorb or Gunn Diode

LV biases from MMIC

Jig Board

KEK clockingsystem

(4Khz and 50 Hz)

KEK preamps(x100)

Q1KEK ADC

PS voltages

Mac Mini

3

Start 4Khz clock End 4 Khz clock

no eccosorb

eccosorb

Hard to see changein Demodoutput

with andwithouteccosorb

Demodoutputhas smallglitches anddrifts

4Gunn Diode ONGunn Diode

OFF

GunnDiodeswitchingON/OFFmakesclear change in DemodOutput