IEEE 187-2018 pdf free.IEEE Standard for Measurement of Emissions from FM and Television Broadcast Receivers in the Frequency Range of9 kHz to 40 GHz.
3. Definitions
For the purposes ofthis document. the following terms and definitions apply. The IEEE Standards Dicsionaiy (hilh,e should be consulted for terms not defined in this clause.
frequency niodulat ion (FM) sound broadcast receiver: A device designed to receive FM sound broadcast from a licensed station on frcqucncics that arc authorized for commercial or public broadcasting.
4. Sources of spurious emissions
Possible sources of spurious emissions typically found in television (TV) and FM receivers are as follows:
a) The local oscillator circuits, which may radiate fundamental, harmonics, and intermodulation products thrmed from the local oscillator fundamental harmonics.
b) Intermediate frequency amplifier, which may radiate spurious signals at the fundamental and harmonics of the intermediate frequency.
C) In television receivers, the video amplifier and any nonlinear circuit element that may produce signals by demodulation of radio or intermediate frequency signals.
d) Digital circuits incorporated for a channel display, or processing ofdigital wanted signals, orany other digital control circuit.
5. Modes of spurious emissions
Possible modes of spurious emissions from sources enumerated in Clause 4 arc as follows:
a) Spurious radiation signals emanating from any internal source, such as those described in Clause 4, may appear on the receiver antenna terminal(s) and be radiated from antenna systems attached thereto. Such signals may be balanced or unbalanced relative to ground.
b) Radiation from the sources enumerated in Clause 4 may appear in the vicinity of the enclosure.
C) Radiation from any of the sources may be propagated through the power supply cord and any peripherals that may be attached to thc receiver. Such radiation may be due to balanced or unbalanced current in the power cord or connection leads.
6.1 General
Television and FM broadcast receivers arc potential sourccs of interfcrencc to othcr tclcvision and FM broadcast receivers, receivers in other services, and other electronic equipment. This clause defines a method for obtaining a measure of the emissions conducted by the power line from those potential interference sources in the frequency range of ISO kH to 30 MHz. This clause describes standard input signals, the equipment sctup. and measurement techniques.
6.2 Equipment requirements and setup details
6.2.1 Test signals
The standard test signal for FM radio receivers is an RF signal modulated with a I kHz tone. The digital test signal is an RF signal modulated with a digital data stream containing sound information.
The standard test signal for television receivers is a standard television color bar signal according to ITU-R BT.471—l. The analog input signal shall be a vision carrier modulated by a complete video waveform. including a color burst together with an unmodulated sound carrier ofcorrect relative amplitude and frequency. The digital television signal shall be an RF signal modulated with a digital data stream containing video and accompanying sound information.
For an analog sound and television receiver, the input level of the test signal at the antenna terminal of the equipment under test (hereafter referred to as the EUT) shall be sufficiently strong to provide a noise-free pictun.
The input level of the digital sound signal at the antenna terminal of the EUT is 60 dBpiV. The input levels of the digital television signals at the antenna terminal of the UT for 75 1? impedance connectors are 50 dflj.*V (VHF and 54 dBpV (UHF) for terrestrial systems.
6.2.2 Supply of the standard test signal
The standard test signal as defined in 6.2.1 shall be supplied to the EUT antenna terminal. If necessaiy, the analog signal may be matched using the 50 1 to 75  antenna isolation transformer described in Annex A.
When the EUT has more than one tuner ora combination olanalog and digital tuners, all reception modes shall be investigated. i.e., analog input, digital input, or combination of inputs. The reception mode with the highest emission relative to the applicable emission limit shall be recorded.
If the EUT has no external antenna terminal and only a built-in antenna, the RF input signal shall be supplied through a radiating antenna at a sufficiently strong level to provide a noise-free picture to the EUT. If the EUT has a removable external antenna. disconnect it before testing.
6.2.3 Adjustment of the operating controls
The customer-operated controls of the receiver—wiih the exception of the tuning adjustment and controls of contrast, brightness, and color saturation for TV receivers -shall be at center or neutral position. Thc controls of contrast, brightness, and color saturation for TV receivers shall be set to produce a normal picture.IEEE 187 pdf download.