IEEE 187-1990 pdf download.IEEE Standard on Radio Receivers: Open Field Method of Measurement of Spurious Radiation from FM and Television Broadcast Receivers.
Abstract: IEEE Std 187-1990, EEE Standard on Radio Receivers: Open Field Method of Measurement of Spurious Radiation from FM and Television Broadcast Receivers, describes the potential sources of spurious radiation from frequency modulation and television broadcast receivers and sets up methods of measurement. This standard is not intended to apply to equipment other than FM and television broadcast ecelvers
Keywords: field-strength meter, frequency modulation, open field measurement, spurious radiation, television broadcast receivers.
Spurious radiations from the local oscillator of modern broadcast radio receivers of the superheterodyne type are possible sources of interference with other radio services. In addition, in the case of television broadcast receivers, there may be radiation from sources other than the local oscillator.
This standard describes the potential sources of spurious radiation from frequency modulation (FM) and television broadcast receivers and sets up methods of measurement. This standard is not intended to apply to equipment other than FM and television broadcast receivers.
1.1 References
This standard shall be used in conjunction with the tNlowing publications:
[11 C63.2-1987, American National Standard Specifications for Electromagnetic Noise and Field Strength. 10 kHz to 40 CiHz (ANSI).
[2j IEEE Std 100-1988. IEEE Standard Dictionary of Electrical and Electronics Terms—4th ed. (ANSI).
[31 IEEE Std 213-1987, IEEE Standard Procedure for Measuring Conducted Emissions in the Range of 300 kHz to 25 MHz from Television and FM Broadcast Receivers to Power Lines (ANSI).
2. Sources of Spurious Radiation
Possible sources of spurious radiation may be as follows:
1) The local oscillator circuits, which may radiate fundamental, harmonics, and intermodulation products formed from the local oscillator fundamental and harmonics
2) Intermediate frequency amplifier, which may radiate spurious signals at the fundamental and harmonics of the intermediate frequency
3) Tn some television receivers, the high-voltage circuits for the cathode-ray tube incorporating radio frequency oscillators, which may be a potential source of radiation at fundamental and harmonic frequencies
4) In television receivers, the sweep circuits, which may radiate harmonics of their fundamental frequencies
5) In television receivers, the video amplifier and any nonlinear circuit element that may produce signals by demodulation of radio or intermediate frequency signals
6) I)igital circuits incorporated for a channel display or any other digital control unit, or both.IEEE 187-1990 pdf download.