portable analysis instruments for ionospheric measurements and research; radio echo sounders; portable sounders for making measurements of the ionosphere; analysis instruments to determine radio signal propagation in support of radio communications or radio surveillance operations; and instruments for automatically collecting and analyzing ionospheric measurements for the purpose of selecting optimum operating frequencies for obliquely propagated communication or radar propagation paths

'analysi':2,20 'analyz':42 'automat':39 'collect':40 'communic':31,56 'determin':23 'echo':10 'frequenc':52 'instrument':3,21,37 'ionospher':5,19,43 'make':15 'measur':6,16,44 'obliqu':54 'oper':35,51 'optimum':50 'path':60 'portabl':1,12 'propag':26,55,59 'purpos':47 'radar':58 'radio':9,24,30,33 'research':8 'select':49 'signal':25 'sounder':11,13 'support':28 'surveil':34

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