Tabla de contenido
Idiomas disponibles
Idiomas disponibles
Technical annex
Output level reduction in broadband amplifiers
BRoADBAND TERRESTRIAL TV AmpLIfIERS : TheJRFJoutputJlevelsJspecifiedJinJthisJ
catalogueJforJIMD3=-60JdBJ(DINJ45004JB)JareJapplicableJwhenJ2JanalogJTVJchannelsJareJ
amplified.JIf,JasJisJusual,JmoreJthanJ2JTVJchannelsJareJamplified,JsuchJlevelsJhaveJtoJbeJ
reducedJaccordingJtoJtheJfollowingJtable:
Number of
Channels (n)
output level
reduction
dB
= 7,5 · log (n-1)
fm, DAB AND CofDm SIGNALS : IfJoutputJlevelsJofJtheJFM,JDABJandJDigitalJTVJ(COFDM)JsignalsJareJ
adjustedJ10JdBJorJmoreJbelowJtheJlevelsJofJtheJanalogJTVJchannels,JthoseJsignalsJcanJbeJignoredJwhenJ
calculatingJtheJoutputJreductionJlevel.JIfJreferredJlevelsJareJnotJreducedJasJindicated,JthoseJsignalsJmustJ
beJcountedJasJnormalJchannelsJandJtheJoutputJlevelJde-ratedJaccordingly.
BRoADBAND SATELLITE TV oR DIGITAL TERRESTRIAL TV AmpLIfIERS : TheJRFJ
outputJlevelsJspecifiedJinJthisJcatalogueJforJIMD3=-35JdBJ(ENJ50083-3)JareJapplicableJwhenJ
1JFM-,JQPSK-JorJCOFDM-modulatedJTVJchannelJisJamplified.JForJaJbiggerJnumberJofJchan-
nels,JsuchJlevelsJhaveJtoJbeJreducedJaccordingJtoJtheJfollowingJtable:
Number of
Channels (n)
output level
reduction
dB
= 10 · log n
CASCADE REDUCTIoN : WhenJmJsame-typeJbroadbandJamplifiersJareJlaidJoutJinJcascade,JanJadditio-
nalJreductionJofJtheJoutputJlevelJequalsJ10J·JlogJmJmustJbeJtakenJintoJaccountJforJeveryJamplifier.
46
2
3
4
5
0
2
3,5
4,5
2
3
4
5
3
4,5
6
7
6
7
8
9
10
5
5,5
6
6,5
6
7
8
9
10
8
8,5
9
9,5
10
15
20
7
8,5
9,5
15
20
13
11,5
Capítulos
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