Electronically Tuned Linear VHF Preselector.
Final rept. Nov 71-Jul 73,
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RS. It summarizes the evaluation of ferrites and solid-state devices primarily PIN diodes for this application, and describes the performance of a digitally tunable, two resonator prototype filter incorporating PIN diode tuners. The prototype clearly demonstrated the feasibility of digitally tuned preselectors and indicated the following potential capabilities High-speed digital tuning across the entire 30 to 80 MHz frequency range without the need for band-switching Insertion loss on the order of 2 dB Inherent frequency stability Low average bias power requirement approximately 63 mW RF power operation to at least 10 watts with second harmonic 80 dB below the fundamental and Small size and lightweight, 8 cubic inches and 7 ounces, respectively. Author
- Radio Communications