MIL-STD-461G RE103: Radiated Emissions, Antenna Outputs
MIL-STD-461G RE103 may be used as an alternative for CE106 when testing transmitters with their intended antennas. This requirement is met if the emissions do not exceed the applicable RE102 limit in transmit mode. MIL-STD-461G RE103 is the preferred requirement unless the equipment or subsystem design characteristics preclude its use. RE103 should be the preferred method for systems using an active antenna or when the antenna impedance has a non-standard impedance curve. The requirement is applicable from 10 kHz to 40 GHz and not applicable within the bandwidth of the EUT transmitted signal or within ±5 percent of the fundamental frequency, whichever is larger. For Navy shipboard applications with peak transmitter power (PtPk) greater than 1 kW, the 5% frequency exclusion is increased by an additional 0.1% of the fundamental frequency for each dB above 1 kW of peak power.
Frequency Exclusion = ±f * (0.05 + (0.001/dB) * (PtPk [dBm] – 60 [dBm]))
Operating Frequency Range (EUT)
Start Frequency of Test
10 kHz to 3 MHz
10 kHz
3 MHz to 300 MHz
100 kHz
300 MHz to 3 GHz
1 MHz
3 GHz to 40 GHz
10 MHz
According to MIL-STD-461G RE103, the equipment will be tested to an upper-frequency limit based on the highest frequency generated or received by the EUT. For systems with the frequencies generated or received less than 1 GHz, the upper-frequency limit will be 20 times the highest frequency or 18 GHz whichever is greater. For systems with frequencies generated or received greater than or equal to 1 GHz, the upper-frequency limit will be 10 times the highest frequency or 40 GHz whichever is less. For equipment using waveguide, the requirement does not apply below eight-tenths of the waveguide's cutoff frequency.
This test procedure is used to verify that radiated spurious and harmonic emissions from transmitters do not exceed the specified
