RADIO INTERFERENCE MEASURING SET AN/URM-100 (XE-1).
Quarterly technical progress rept. no. 2, 26 Sep-25 Dec 63,
WATKINS-JOHNSON CO PALO ALTO CALIF
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The design plan for the ANURM-100XE-1 is essentially complete. The areas of microwave subsystem, IF sub-system, and data handling were extensively examined and basic block diagrams were prepared. Development of the stable BWO local oscillator has progressed quite satisfactorily. The present circuit has given the following performance 0.6 tuning linearity 10 kc p-p incidental FM 150 kc hr drift. Sensitivity, linearity and spurious signal generation measurements were made on both a conventional mixer and a tunnel diode mixer, and the results are given. The tunnel diode mixer generates spurious signals at lower input level than the conventional mixer, and has poorer noise figure and sensitivity. The conventional mixer is therefore the choice for this application. Odd order product IM measurements were made on an ultra-low noise TWT, and these results are presented. It is shown that mixer fourth order and TWT third order products will be the first spurious responses which will appear as the input power is increased from low levels. Author