NSA

Normalised Site Attenuation

Measurement Description

Normalised Site Attenuation (NSA) is measured in accordance with CISPR 16-1-4 and ANSI C63.4 in semi and fully anechoic environment.

Semi anechoic chambers and open area test sites (with weather protection) are validated in the frequency range from 30 MHz to 1 GHz with broadband antennas in horizontal polarisation at 1 m and 2 m height and in vertical polarisation at 1 m and 1.5 m height. The volumetric test method is applied (test volume diameter need to be specified); test distance: 3 m or 10 m, any other distance upon request. The height scan of the receive antenna is carried out in the range of 1 to 4 m above ground plane, any other scan range upon request.

For open area test sites (OATS, without weather protection) the NSA is measured in the frequency range from 30 MHz to 1 GHz (30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200, 250, 300, 400, 500, 600, 700, 800, 900, 1000 MHz) with our tuned Precision Reference Dipoles PRD in horizontal and vertical polarisation at 2 m height, centre of the turntable, test distance: 3 m or 10 m, any other distance upon request.

Fully anechoic rooms (FAR) are validated in accordance with CISPR 16-1-4 -Reference Site Method (RSM): in the frequency range from 30 MHz to 1 GHz with broadband antennas in horizontal and vertical polarisation. The volumetric test method (fixed distance, with "tilting") is applied: 5 points in 3 heights each, nominal test distance: 3 m - any other distance upon request, "Site Reference Method" for antenna calibration applied.

 

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