MIL-STD-469 Radar Engineering Interface Requirements, Electromagnetic Compatibility See Notice 1 For Replacement InformationThis standard establishes the engineering interface requirements to control the electromagnetic emission and susceptibility characteristics of all new military radar equipment and systems operating between 100 megahertz MHz, and 100 gigahertz GHz, to ensure EMC in all intended operational environments, and to conserve the frequency spectrum available to military radar systems.

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MIL-STD-469B APPENDIX A

waveguide systems should be tested up to the frequency where the device for sampling the in-guide signal fails to provide a reliable correlation of the measured data to the radar antenna input levels. The maximum

frequency for making closed system measurements on radars employing waveguide transmission line should be the cutoff frequency for the first higher order mode of propagation in the waveguide.

30.16.3  Open field test site.  Radar emissions at frequencies exceeding the upper values specified (see

30.16.2) and radar antenna characteristics should be measured in the open field or an anechoic chamber which approximates free space conditions. Unless otherwise specified, the minimum separation between the radar antenna and the test antenna at the open field site should be D   2I   or 3  , whichever is larger, where D   is the maximum aperture dimension of the radar antenna and      is the wavelength at the radar F o. If the test antenna aperture (D2) is larger than D1I10, then the minimum radar antenna-to-test site separation should be (D 1  +

D )2I  . The expected power density (P   ) at the test site should be calculated using the equation:

PD  = PT  + GT

(20 log R)     11.0

where R is the horizontal separation between the equipment antenna and the test antenna. The measured power density should be no more than 2 dB below the calculated value. If the variation is greater than plus or minus 3 dB, tests should not be continued without the approval of the contracting activity.

30.17  Radar receiver standard response.  The standard response for pulsed receivers should be the minimum visible signal (MVS) except for the overall selectivity test, where the standard response will be the mid-pulse minimum visible signal (MPMVS). The standard response will normally be measured at the receiver video output with a test oscilloscope. Where a particular piece of equipment or system (because of its unique configuration or type of modulation) cannot be measured in accordance with this definition, a different definition that is representative of the operational performance requirements of that equipment or system should be designated and employed upon approval of the contracting activity's technical representative or other designated technical authority.

40.  RADAR TRANSMITTER MEASUREMENTS

40.1  Requirements summary.  The radar transmitter measurement and procedures described in this section provide data for comparison to emission characteristics, frequency tolerance and system tunability requirements and limits (see 5.3).

40.2  Power output.

40.2.1  Objective.  The objective of this test is to determine the ability of a radar system to deliver the minimum rated power output over the approved frequency band.

40.2.2  Requirements.  Radar systems should produce the minimum rated power output when tuned over the approved frequency band.

40.2.3  Application notes.

40.2.3.1  The radar power output should be measured with the radar tuned to each operating frequency as specified in table III.

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