TechniSat Line Amplifier 17Z Benutzerhandbuch
Seite 23
8 Calculation assistance for calculating the “range of coverage”
of satellite signals via cable
1)
in the trunk, because of parallel switching via direct current (each of 7 individual co-axial
cables) this is less than that of a single co-axial cable
2)
Average value, a single line has 530 mOhm (important for installations with no direct cur-
rent connection of the trunk lines (see Paragraph.3).
Loss (dB/x metre) of suitable cable types
Output levels of a SV-500 antenna socket
23
GB
Loss (dB)
Loop resistance
Fall-off voltage
20m/66ft.
Multi-media cable
-5 ....–8,4
150 mOhm
1)
0,15 V
(at I = 1 A)
Trunk of 17/8KR with 5m/16ft.
multi-media cable
-4 ... -6
250 mOhm1),2)
0,5V (at I = 2A)
Tap of 17/8XX with 25m/82ft.
CoaxSat 2150 and socket
-8,5 ... –9
1 Ohm
0,25V (at I =50mA)
Type
CoaxSat 2150 (100 dB)
Mini-,
Multimedia
dB at frequency/MHz
30 300 860
2150
30
300
860
2150
10 m/33ft
0,3
1
1,8
3
0,5
1,5
2,5
4,2
20 m/66 ft
0,6
2
3,6
6
1
3
5
8,4
30 m/100 ft
0,9
3
5,4
9
1,5
4,5
7,5
12,6
40 m/130 ft
1,2
4
7,2
12
2
6
10
16,8
50 m/165 ft
1,5
5
9,0
15
2,5
7,5
12,5
21
60 m/200 ft
1,8
6 10,8
18
70 m/230 ft
2,1
7 12,6
21
Loop resistance (core
and shield)
- For a single cable
- For the 7 cables of a
feed voltage
0.35 Ohm/10m
60 mOhm/10m
0.56 Ohm/10m
80 mOhm/10m
Socket loss
Level
minimum recommended maximum
Satellite range
2 dB
47 dBμV
58 dBμV
79 dBμV
FM
5 dB
50 dBμV
63 dBμV
70 dBμV
analogue terr. TV
VHF 4 dB/ UHF 3 dB
55 dBμV
40 dBμV
47 dBμV
63 dBμV
50 dBμV
55 dBμV
70 dBμV
70 dBμV
70 dBμV
DVB-T
DVB-C
GigaSystem_17_8_Zubehör_deu_engl_02032007.qxp 02.03.2007 11:27 Seite 23