Communications Critical Design Review Package. Appendix A. Part 1. Intermodulation Phenomenology Investigation. Part 2. Intermodulation Cancellation Study.

摘要

The Intermodulation (IM) Phenomenology Investigation was instigated to obtain an understanding of the IM generating phenomena involved in FLTSATCOM UHF Communications hardware, and thus to determine materials and processes that would reduce the IMs to acceptable levels. The two IM generating phenomena which were identified as being particularly troublesome to FLTSATCOM were untrimmed soft solder joints and the use of electroless nickel as a preparatory coating for plating copper on aluminum. Guidelines for IM reduction are given. In the Intermodulation Cancellation Study, 3/8 scale measurements were made. Both active and passive methods of suppression were investigated which reduced IMs but none of the systems investigated were directly applicable to FLTSATCOM. (Author)