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Frequency (MHz)
Powering (dBμV)
200
500
800
1000
1750
2150
In the used cable specifi cations, the attenuation
per meter (dB/m), that the signal undergoes will
appear. This attenuation varies with the frequency,
growing as the frequency increases.
In the following image you can see the signal at the
input (in the terrestrial band):
The terrestrial band
80.0
78.5
78.9
78.8
79.5
82.5
In this example the T-100 (ref. 2141) interior/
exterior cable, and 85 m for the length of the
wire have been taken as a reference. The total
attenuation is calculated by multiplying the
attenuation/m by the length of the cable.
Frequency
(MHz)
200
500
800
1000
1750
2050
The satellite band
Attenuation
Total
(dB/m)
attenuation (dB)
0.08
6.8
0.12
10.2
0.15
12.75
0.18
15.3
0.24
20.4
0.27
22.95
- Connect the noise generator to one end of the
cable.
- Connect the fi eld meter to the other end of the
cable, confi gure it in spectrum mode and select
"Full Span". You will see that the spectrum of the
received signal is no longer fl at, but that the level
decreases as the frequency increases, as shown in
the following picture:
The terrestrial band
17
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