IEEE 187:1990 pdf download.IEEE Standard on Radio Receivers:Open Field Method of Measurement of Spurious Radiation from FM and 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
IEEE 187 shall be used in conjunction with the following publications:
[1] C63.2-1987, American National Standard Specifications for Electromagnetic Noise and Field Strength, 10 kHz to
40 GHz (ANSI).
121 IEEE Std 100-1988, IEEE Standard Dictionary of Electrical and Electronics Terms 4th ed. (ANSI).
[3] IEEE Std 213-1987, IEEE Standard Procedure for Measuring Conducted Emissions in the Rangeof 3(X)kl-Iz to25 MHz from Television and FM Broadcast Receivers to Power Lines (ANSI).
1.2 Definitions
Definitions in this standard are in accordance with IEEE Std 100-1988 12]
2. Sources of Spurious Radiation
Possible sources of spurious radiation may be as following:
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) In some television receivers, the high-voltage circuits for the cathode-ray tube incorporating radio frequency oscillators, which may he 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) Digital circuits incorporated for a channel display or any other digital control unit, or both
3. Modes of Spurious Radiation for Spurious Signals
Possible modes of spurious radiation from sources enumerated in Section 2. may occur as follows:
I) Spurious radiation signals emanating from any internal source, such as those described in Section 2., may appear on the receiver antenna terminal(s) and he radiated from antenna systems(s) attached thereto. Such signals may be balanced or unbalanced to ground.
2) Radiation from the sources enumerated in Section 2. may appear in the vicinity of the receiver due to direct electric fields or magnetic fields or both, created by the components assembled on or within the chassis or by cavity resonance.
3) Radiation from any of the sources may be propagated through the power supply cord and any peripherals that may be attached to the receiver. Such radiation may be due to balanced or unbalanced current in the power cord or connection leads. This standard does not cover the radiation measurement of this type.
NOTE — See IEEE Std 213-1987 [31, or latest revision thereof, for details.IEEE 187 pdf download.