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

5.3  Transmitter limits.

5.3.1  Transmitter emission bandwidth.  The maximum emission bandwidth for radars at the antenna input shall not exceed the limits as specified in table IV.

5.3.2  Transmitter emission levels.  The transmitter maximum emission levels, outside the maximum emission bandwidth (B  40dB) specified in 5.3.1, shall not exceed the values as specified in table V. The F MIN and FMAX range over which the maximum emission level applies sha ll be as specified in table VI. The value for  Pt  as specified in table V shall be determined by applying the radar parameters using the followin  g equation:

P

t           p

where:

+ 20 log [(N)(t)] + 10 log (PRF)     PG     90

PG = 0, for non-FM, non-coded pulse radars

PG = 10 log(d), for FM pulse radars

PG = 10 log(N), for coded pulse radars.

TABLE IV. Transmitter emission bandwidth limits for B  40 dB.

r                                                                                               r

r                        c                                                                     r                        c

7.6/(trt)   + 2Bc  + Bs

6.2/(trt)   + 2Bc  +Bs

m or coded-pulse radars.

1Including spread spectru

2Up to maximum of 64/t for group B and group C.

3For FM-pulse radars with pulse rise time of less than 0.1 microsecond, an operational justi- fication for the short rise time shall be provided.

4For frequency-hopping radars; with pulse compression but with pulse rise time of less than 0.1 microsecond or without pulse compression but with pulse rise of less than 0.01 microsecond, an operational justification for the short rise time shall be provided. The radar spectrum shall not intrude into adjacent spectrum regions on the high or low side of the band, defined by Bs, more than would occur if the radar was fixed-tuned at carrier frequencies equivalent to the end values of Bs  and was complying with the requirements for FM and non-FM pulse radars.

5If t  is less than t , then t t shall be used in place of t t.

5.3.3  Transmitter frequency tolerance.  The maximum frequency tolerance for radar transmitters shall not exceed the limits as specified in table VII.

5.3.4  Transmitter tunability.  The frequency tuning band of the radar shall be the band approved for the specified equipment by the Joint Frequency Panel, United States   Communication Electronics Board and shall be specified in the cont ract or order. Each radar shall be tunable in an essentially continuous manner over the approved frequency band or over a band which is 10 percent of the mid-band frequency. Crystal

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