By Institute of Electrical and Electronics Engineers. Antenna Standards Committee

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Additional resources for IEEE Std.149-1979 Test Procedures for Antennas

Example text

Specifically it senses each positive axis crossing. At that instant each axis-crossing sensor provides a narrow pulse output. Measurement of the time between axis crossings of the signal in channel A and that in channel B can be directly translated to degrees at 1 kHz, and consequently to the input radio-frequency signal. With a- system of this type, amplitude variations of the signals in the two signal channels and the phase difference between them can be measured simultaneously. Amplitude and phase readouts can be provided in either analog or digital form as required.

Antenna-pattern recorders are typically designed to operate at a fixed 1 kHz audio carrier frequency; for these cases the output of the receiver shall be 1 kHz. Antenna-pattern-range receivers are usually designed for continuouswave reception, and the 1 kHz amplitude modulation is introduced in the receiver. The need for remote adjustment of the modulation frequency of the signal source is thus eliminated. A bolometer is most often used for detecting the 1 kHz modulation of the intermediatefrequency carrier.

Usually the level of wide-angle reflected waves is at least 30 dB below the level of the direct wave. When the test antenna is oriented so that its major lobe is pointing toward the source antenna, the reflected wave is received on a side lobe. The effect upon the measured level of the major lobe is negligible. However, if the antenna is rotated such that the major lobe is pointing toward the direction of the incoming reflected wave and a side lobe is pointing toward the source antenna, then the 52 apparent level of the side lobe can deviate significantly from that obtained in the absence of the reflected wave.

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IEEE Std.149-1979 Test Procedures for Antennas by Institute of Electrical and Electronics Engineers. Antenna Standards Committee


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IEEE Std.149-1979 Test Procedures for Antennas by Institute of Electrical and Electronics Engineers. Antenna PDF
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