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7.
Concept
7.1. Unit conversion chart
Unit
μV
mV
dBμV
dBmV
dBm
7.2. Analog TV Standard and Color Transmission System
Basic Knowledge
There are many different TV standards in use around the world, defining in detail
the baseband and RF structure of the signal, but for the broadband engineer and
technician,
the key parameters are; bandwidth, the dimensions of the lower
(vestigial) and upper sidebands, the frequency and amplitude relationships of the
vision (luminance), color (chrominance) and audio subcarriers.
In terms of these parameters, the vast majority of TV transmissions fall into just
six categories, which are illustrated in the following diagrams.
Note that these diagrams do not define such parameters as field frequency, line
frequency, or color encoding technique, which distinguish the NTSC, PAL and
SECAM systems.
The letters B, G, M, etc. refer to TV standards, and the encoding techniques (NTSC,
PAL, etc.) refer to systems.
The relationship between the TV standard and color transmission system
246
S7200 TV Signal Analyzer Operation Manual
Impedance 50Ω
1μV=10
V
-6
1mV=1000μV
0dBμV=1μV
0dBmV=1mV
0dBm=107dBμV
Impedance 75Ω
1μV=10
V
-6
1mV=1000μV
0dBμV=1μV
0dBmV=1mV
0dBm=108.8dBμV
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