July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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135
Second symbol
0 No modulating signal
1 Digital signal without modulating sub-carrier
2 Digital signal with modulating sub-carrier
3 Analogue signal
7 Two or more channels with digital signals
8 Two or more channels with analogue signals
9 Composite system with one or more channels of digital
signals and one or more channels of analogue signals
X Other cases
Third symbol
A Aural telegraph
B Automatic telegraph
C Facsimile
D Data
E Telephony (and sound broadcasting)
F Television
N No information transmitted
W Combination of any of the above
X Other cases
9.4 Bandwidth and frequency designations
A four symbol code should be used to express bandwidth and fre-
quency to three significant figures. A letter to denote the unit of
frequency is placed in the position of ...
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