A Handbook For EMC Testing and Measurement

Appendix 2

Appendix 2.1: Modulation Rules

Table A2.1: MIL STD 462 (N3) modulation rules

For communications equipment

(a)

AM receivers: modulate with 50% 1 kHz sinusoid

(b)

FM receivers: When monitoring signal-to-noise ratio, modulate with 1 kHz signal and 10 kHz deviation

(c)

SSB receivers: No modulation

(d)

Other equipments: As for AM receivers

Equipments with video channels:

Use 90 ?100% pulse modulation with

duration of 2 /BW and repetition rate of

BW/1000, where BW = video bandwidth

Digital equipment:

Use pulse modulation with pulse duration

and repetition rates equal to that used in

equipment

Nontuned equipment:

AM at 50% with 1 kHz sinusoid

Table A2.2: DEF STAN 59 41 modulation rules

Susceptibility frequency

Modulation type

Ship and land service use:

20 Hz 50kHz

CW

50kHz 1 GHz

(a)

CW

(b)

AM 100% square or sine at frequencies in the range

100 Hz 10 kHz

(c)

AM 100% square 1 Hz

200MHz 18GHz

Pulsed CW, pulse length 1; ?s, PRF 1 kHz

(for test DRS02 only)

For aircraft use:

20Hz 50kHz

CW

50kHz 2MHz

(a)

CW

(b)

AM 100% square at 1 kHz PRF

2 MHz 30 MHz

(a)

CW

(b)

AM 100% square at 1 kHz PRF

(c)

AM 100% square at 1 3 kHz PRF

30MHz 1GHz

(a)

CW

(b)

AM 100% square at 1 kHz PRF

Radiated testing

(a)

CW

1 18 GHz

150 225 MHz

580 610 MHz

0.79 18 GHz

(b)

A complex modulation of pulse (1 ?s)...

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