FREQUENCY CONVERTER UNITS FOR L-BAND, S-BAND, C-BAND, AND X-BAND.
Interim development rept. no. 8, 1-29 Feb 64.
ELECTROMAGNETIC TECHNOLOGY CORP PALO ALTO CALIF
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The developmental frequency converter based on a 3 db directional coupler was built and tested. The directional coupler has suitable characteristics. However, the impedance matches in both K-band and at lower frequencies are unsatisfactory. Modifications to improve both responses are under way. The special crystal from Gc Electronics was received and tested. Its power handling capability appears good. However, the conversion loss is rather high, and the prospects of obtaining an acceptable impedance match over S-band are poor. An experimental S-band down converter using a single 1N53B crystal was set up and tested. Without tuning and with no special matching network in the IF line, the conversion loss averaged 11 db over S-band, varying between 9 and 13 db. Automated apparatus to record the K-band rectification characteristics of various diodes is being prepared. This apparatus will expedite the work of inspecting new diodes and of determining if diodes have been injured during other tests. Impedance tests of diodes continued during the interval. The principal outcome of this work is demonstration of a considerable interaction between input and output impedances in both up converter and down converter operation. Author