Technisat Line Amplifier 17Z Manuel d'utilisateur télécharger pdf (Page 23)

8 Calculation assistance for calculating the “range of coverage”

of satellite signals via cable

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

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

Loss (dB) Loop resistance Fall-off voltage

20m/66ft.

Multi-media cable

-5 ....–8,4 150 mOhm

0,15 V

(at I = 1 A)

Trunk of 17/8KR with 5m/16ft.

multi-media cable

-4 ... -6

250 mOhm

1),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

DVB-T

DVB-C

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Technisat Line Amplifier 17Z Manuel d'utilisateur Page 23

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