Cesar A. Filippi; Gary M. Patrick; Ernesto A. Cerezo; Robert C. Wilson

Abstract: This report presents a detailed assessment of the hydrologic and meteorological operations in the 162–174 MHz (VHF) and 406.1–420 MHz (UHF) bands. These operations are currently supported by hydrologic and quasi-hydrologic channel assignments in these bands. There is a current need to jointly support hydrologic and nonhydrologic operations representing important national programs, and to develop solutions that alleviate spectral congestion and promote efficient spectrum utilization. This report identifies current regulations and channel usage, and analyzes the hydrologic emission characteristics to assess their bandwidth requirements and conservation alternatives. The current hydrologic channeling plans are also analyzed, and narrowband channeling options are assessed, along with the potential hydrologic service reaccommodation in current or other bands. All potential relocation and channeling options are explained and compared to illustrate their impact, tradeoffs, and compromises. The results of this study can serve to improve the spectral efficiency of hydrologic operations while remaining cost effective, and to conserve spectrum that can be made available for additional uses.

Keywords: 162-174 MHz Band; 406-420 MHz Band; Hydrologic Operations; Narrowband Channeling Plans; spectrum conservation; Wireless Microphones

To request a reprint of this report, contact:

Ed Drocella, Chief,
Spectrum Engineering and Analysis Division
Office of Spectrum Management
National Telecommunications and Information Administration
(202) 482-1652

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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