IEEE 187-1990 pdf free

04-29-2021 comment

IEEE 187-1990 pdf free.IEEE Standard on Radio Receivers: OpenField Method of Measurement of Spurious Radiation from FM andTelevision Broadcast Receivers.
IEEE 187  of spurious radiation from sources enumerated in Section 2.m ay occur as follows:
1) Spurious radiation signals emanating from any intermal source, such as those described in Section 2., m ay appear on the receiver antenna terminal(s) and be radiated from antenna systems(s) attached thereto. Suchsignals may be balanced or unbalanced to ground.
2) Radiation from the sources enumerated in Section 2.m ay 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 bycavity reson ance.
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 powercord or connection leads. This standard does not cover the radiation measurement of this type.
NOTE — See IEEE Std 213-1987 [3], or latestrevision thereof, for details.
This standard defines a system whereby the radiation described in Sections 2. and 3. may be measured. It alsoestablishes operating conditions and equipment specifications necessary for accomplishing these measurements. Inthis method, the receiver and measuring equipment are set up under reproducible conditions as described below, andthe field strength of the various radiations is measured under specified conditions. This method is applicable to themeasurement of spurious radiation in the frequency range of 30 to 1000 MHz from those sources producing anappreciable field at 3 m. For radiation in other bands, other methods of m easurement may be necessary.
When testing receivers designed for use with unbalanced shielded transmission line, the antenna term inal of thereceiver shall be connected to the transm ission line through a balanced-to-unbalanced transform er of the type specifiedby the m anufacturer. In such a case , the insertion loss of the balanced-to-unbalanced transformer used shall be sm allenough so that the connection does not affect the measurement. If the receiver is designed to operate from either anunbalanced transmission line or a balanced line, the latter shall be used in these measurements. The balancedtransmission line shall not be shielded.
The receiver under test shall be placed on a rotatable nonconducting table, the top of which is 0.8 m above ground, asshown in Fig 2.The plane of the front panel of the cabinet shal be parallel to the dipole, and the center of the cabinetshall be directly below ofthe center of the dipole. In the event that the receiver under test does not fit on the table, suchas may be the situation for console receivers, the height of the table may be 0.4 m above ground.IEEE 187 pdf download.

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