Accession Number:

AD0475968

Title:

INTERFERENCE REDUCTION TECHNIQUES FOR RECEIVERS.

Corporate Author:

RADIO CORP OF AMERICA NEW YORK DEFENSE ELECTRONIC PRODUCTS

Report Date:

1965-08-31

Abstract:

This report on Interference Reduction Techniques for Receivers, outlines the basic achievements during the first two-year period of this contract. During this period, equations were derived which can accurately predict the amount of cross- and intermodulation products in a receiver mixer or amplifier. These equations are valid for any interfering or signal levels. In addition, it was proven that a square-law device, when placed in an operating circuit, will not have a true square-law characteristic and, hence, will contain cross- and intermodulation products. Furthermore, devices such as an exponential mixer will, for a given signal and local oscillator level, have the same intermodulation distortion within 1 db as a near square-law device such as a mixer or parametric converter. It has also been shown theoretically and proven experimentally that intermodulation distortion is directly proportionate to signal levels. A 1-db decrease in signal level will decrease intermodulation distortion by 2 db, and cross-modulation distortion by 1 db. At the same time, it was shown that an increase in the local oscillator power of typical mixers, including resistive, point-contact, hot-carrier, varactor, and tunnel-diode, will increase the dynamic range by the same amount. The report contains a Highlights Section and also a systems evaluation of receiver performance. Author

Descriptive Note:

Interim rept. no. 2 (Final), 1 Jun 64-31 Jul 65,

Pages:

0149

Contract Number:

DA-36-039-AMC-02345(E)

File Size:

0.00MB

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