Installation guide

5.1 Additional reference to LNB’s, cables and wall-sockets
LNB’s:
Switchable LNB’s (Quatro Switch LNB’s or Twin LNB’s) should only be used if they are alrea-
dy available, only for single party installations and also only with SAT1 inputs (Option A /
Position A, here the switching matrix provides 22 kHz for the High Band). The degradation in
insulation consistent with the use of switchable LNB’s does not affect single-party installati-
ons (using only a single 17/8G and a 17/8K).
In conjunction with SAT1, two Twin LNB’s can only be used for two different orbital positions.
As far as the intention to receive two planes of a Low Band, this can also be achieved by
using a Dual Output LNB or a TWIN LNB.
If you require only a single polarisation plane in the Low Band range, you can use a Single
LNB for this. A polarisation plane in the High Band range can be received via a Single LNB
only via the SAT1 connection.
Cable:
Table 1: Loss (dB/x metre) of suitable cable types
> Regarding selection of the cable see also chapter 4.2
Type CoaxSat 2150 (100 dB)
Mini-,
Multimediacable
dB at frequency/MHz 30 300 860 2150 30 300 860 2150
10 m 0,3 1 1,8 3 0,5 1,5 2,5 4,2
20 m 0,6 2 3,6 6 1 3 5 8,4
30 m 0,9 3 5,4 9 1,5 4,5 7,5 12,6
40 m 1,2 4 7,2 12 2 6 10 16,8
50 m 1,5 5 9,0 15 2,5 7,5 12,5 21
60 m 1,8 6 10,8 18
70 m 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
30
GB
GigaSystem_17_8_deu_engl_23112011_3.qxp 28.11.2011 09:34 Seite 30