DirecTV HR10-250 User Manual page 14

C h a p t e r 1
Round
Single LNB
Single satellite
Round
Dual LNB
Single satellite
Oval
Dual LNB
Two satellite
Required for all HD programming:
Oval
Triple LNB
Multi-satellite
4
Satellite Dish Antennas and LNBs
Satellite dish antennas come in two shapes, Round and Oval. A Round dish receives
signals from one satellite (Sat A), while an Oval dish can receive signals from two or three
satellites (Sat A, Sat B, and Sat C). Every satellite dish antenna includes at least one Low
Noise Blocker (LNB). The LNB is the device at the focal point of the satellite dish that
gathers the signal reflected by the dish and sends it to your HD DVR. (It's the mushroom
shaped "finger" pointed back at the dish from the extended "arm.")
There are three types of LNBs, single, dual, and triple. A single LNB sends one signal and
has one jack, or connector, inside the arm extending from the dish. A dual LNB sends two
signals and has two jacks. A triple LNB dish adds an extra LNB for the third satellite (Sat
C). The LNBs determine the number of independent signals your dish can send to your
HD DVR.
If you have a two satellite dish, or a multi-satellite dish, your HD DVR will not work
properly unless you have connected a multiswitch as well. Some satellite dish antennas
have a multiswitch built-in. For more information about multiswitches, see page 6.
Remember, you need a triple LNB multi-satellite dish for full functionality: to receive all
high-definition programming from DIRECTV, and to take advantage of the HD DVR's
dual tuner functionality (described on page 6). If you can't tell by looking at it, the easiest
way to determine what type of dish you have is to consult the documentation that came
with the dish. Disassembling the dish to determine its type is not recommended. If you
currently own a different type of satellite dish, contact the installer or retailer for
information about upgrading your dish.
C o n n e c t i n g