IEC 61319-2:1997 pdf download

IEC 61319-2:1997 pdf download.Interconnections of satellite receiving equipment – Part 2: Japan
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61 31 9. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 61 31 9 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of ISO and IEC maintain registers of currently valid International Standards.
IEC 60268-1 1 : 1 987, Sound system equipment – Part 1 1 : Application of connectors for the
interconnection of of sound system equipment
IEC 60268-1 5: 1 987, Sound system equipment – Part 1 5: Preferred matching values for the
interconnection of sound system components
IEC 60603-1 4, Detail specification for circular connectors for low frequency audio applications
such as radio and associated sound equipment 1 )
IEC 60958: 1 989, Digital audio interface
IEC 61 31 9-1 : 1 995, Interconnections of satellite receiving equipment – Part 1 : Europe
3 Definitions
For the purpose of this part of IEC 61 31 9 the following general definitions apply. For other
explanations of terms and abbreviations, see IEC 61 31 9-1 .
3.1 mechanical polarizer: Polarizer which can select one type of polarization by rotating a
probe mechanically with a servo-motor. The type of polarization is determined by the pulse
duration of a control signal.
3.2 magnetic polarizer: Polarizer which can select one type of polarization by changing the
current of a Faraday rotator.
3.3 polarization switcher (polar switcher): Device which can select one type of polarization
by selecting electrically an LNB that corresponds to that type of polarization. The type of
polarization is determined by the supply voltage for the LNB.
4.2 Magnetic polarizers
The constant d.c. current supply shall be capable of passing 40 mA into a load resistance of 60 & to 1 80 &. Current in one direction corresponds to horizontal (H) polarization, and a reverse current corresponds to vertical (V) polarization. 4.3 Polar switcher The polarization is selected by changing the supply voltage for the LNB fed by the centre conductor of the IF output cable. LNB supply voltages and required powers are: – 1 3,5 V to 1 6,5 V and less than 4 W corresponds to horizontal; – 9,5 V to 1 2,0 V and less than 3 W corresponds to vertical. The above values apply to the input of the LNB or polar switcher. NOTE – It is recommended that the control signal voltages at the indoor unit output are determined taking into consideration the voltage drop between indoor unit and LNB. For example, if the voltage drop is 1 ,3 V, the specification of the output voltage should be 1 4,8 V to 1 6,5 V for horizontal and 1 0,8 V to 1 2,0 V for vertical polarization.
5 Interface requirements for low-noise block converters
5.1 Characteristic impedance of the first intermediate frequency (IF) The output characteristic impedance shall be 75 &. 5.2 Interface between the LNB (outdoor part) and the satellite receiver (indoor part): one input signal. 5.2.1 Single-band block converters The supply voltage shall be applied to the centre conductor of the coaxial cable which also carries the IF output.
7 Interface requirements for satellite receivers and external decoders, descramblers and conditional access systems
The output connector on the satellite receiver for the external decoder, descrambler and conditional access system shall be as specified in IEC 61 31 9-1 . The output impedance shall be 75 &.