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

PRF: 650 pps

Signal generator level (P GEN):    20.0 dBm

Signal generator frequency: 4203.615 MHz

Attenuation inserted (A  ): 5.0 dB

Cable loss (A  ): 2.2 dB Adapter loss (A  ): 0.8 dB.

The power input at the receiver input plane of reference (P R) is calculated as follows:

PR    = PGEN

A1        A2        A3

=    20.0     5.0     2.2     0.8

=    28.0 dBm.

60.4  Receiver tunability and frequency stability.

60.4.1  Objective.  The objectives of this test should be to verify that the radar receiver is tunable over the required frequency range and that the frequency stability is within the frequency tolerance specified. This test should also verify that crystal controlled receivers achieve the tunability requirements of operation at essentially any frequency across the band with a crystal change.

60.4.2  Requirements.  The frequency stability of receivers should be commensurate with or better than the frequency tolerance of the associated transmitter. The frequency tolerance requirements for radar transmitters, which apply to radar receivers should be as specified (see 5.3.3 and 5.5.4) and tunability requirements should be as specified (see 5.3.4 and 5.5.3). The frequencies to be measured for the tunability test should be selected in accordance with 40.7 for transmitter tunability. The frequencies  to be selected for the frequency stability test should be F L, FM, and FH  as specified in table III. The receiver frequency stability test requirement should be waived for radar systems which normally employ automatic frequency control (AFC) or similar means for maintaining the receiver tuned frequency equal to the transmitter frequency. The receiver tunability and frequency stability test should be performed with the radar system or equipment operating at nominal environmental temperatures as specified and the minimum and maximum environmental temperatures as specified.

60.4.3  Application notes.  A measure of the tunability of a radar receiver is its ability to attain rated sensitivity over its operating band. The receiver tunability should be determined from measurements of the receiver sensitivity at each test frequency as specified. Unless otherwise specified for the receiver nominal parameters, the standard output response should be minimum discernable signal (MDS) observed on the test oscilloscope display. If the required sensitivity of the receiver is not specified over the operating band, the minimum signal level and corresponding receiver standard response should be established by the contracting activity and included in the test plan.

60.4.3.1  A measure of the frequency stability of a radar receiver is the ability of its frequency producing circuits to maintain the receiver tuned frequency within the frequency tolerance specified.

60.4.4  Procedure.  The receiver tunability and frequency stability measurements should be performed as a closed system test. The block diagram is shown on figure 33.

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