Your
Satellite Downlink
Installing
a New Satellite Dish
IN
THIS SECTION:
Site
Selection
Dish
Selection
LNB
Selection
Dish
and LNB Installation
Setting
and Adjusting the Antenna
Coaxial
Cable
Receivers
Coaxial
Cable
Cable
signal loss and cable length are important considerations in a satellite
installation. All cables for the satellite L-band IF must be 75 ohms.
| |
Loss
per 100 feet at 1,500 MHz |
Max
Length without an amplifier |
| RG-59
|
11 dB |
150 feet |
| RG-6 |
8 dB |
200 feet |
| RG-11
|
5 dB |
330 feet |
Do
not use "video cable", even if labeled "professional". It has even higher
loss than RG-59.
Splitters allow you to put more than one receiver on the same LNB cable.
Keep in mind that each 2-way split adds almost 4 dB to system losses
unless an amplified "lossless" splitter is installed. Don't use splitters
from home centers or electronics stores that are intended for TV frequencies.
Correct
installation of the cable is extremely important. Make sure the connectors
are crimped properly and weatherproofed. Direct-bury rated cable should
not be buried under roads or parking lots. If possible, use metal or
plastic conduit.
