SMW LNB User manual
LNB
Installation
Guide
USER GUIDE
Please read and un-
derstand the contents
of this instruction
before attempting to
connect or use the
system!
1. Description
This Mounting instruction is written to help you to avoid
some trap one can fall in to during installation of an LNB.
Please, read carefully to understand all important things
to consider about.
Contents:
1. Description
2. Safety
3. Installation instructions
4. Troubleshooting
2. Safety
2
WARNING!
Make sure that the antenna system is
grounded to earth to avoid potential voltage
that can be discharged through the LNB.
WARNING!
Avoid to install the coaxial cable to the LNB
along cable ladders with high voltage cables
to minimize the risk of induced voltage into
the LNB cable.
NOTE! If 230 VAC cable and LNB cable
are close up along a cable ladder there can
be hazardious voltage for the LNB!
WARNING!
Read carefully the datasheet and on label
about DC voltage to the LNB. Both too Low
or too High voltage can affect the functionality.
(Fig 1).
NOTE! Too High Voltage can damage the
LNB.
WARNING!
There are no customer serviceable parts
inside, refer service to the SMW factory.
Fig. 1 LNB Input DC Voltage
NOTE! Make sure that the DC Voltage is
minimum 12 VDC at the LNB input. If a
long cable for the DC feed is used this
can give malfunction.
3. Installation instructions
Unpacking
Please check the contents of your shipment upon receipt
towards the packing list supplied and notify us immediate-
ly if you feel that something is missing.
Mounting
Always use the attached screws and O-ring when
mounting the LNB to the antenna feed system, any other
means of mounting may void the warranty, Fig 2.
The system components are weatherproofed and desig-
ned for operation in temperatures between, -40 to +80°C
but to avoid water impact to the coaxial cable connector
we recommend to protect with rubber seal tape, see
Fig. 3.
NOTE! If the LNB has more than one connector and
the other connector(s) are not used, the weather
protecting covers on the LNB shall not be removed
before installation and unused connector(s) shall be
remained protected with cover(s) (Fig. 4).
However, for extreme environments such as close to
corrosive salt/sea water or elevated installation in anten-
na towers where IP67 class protection can be deemed
insufcient, it is recommended that appropriate action is
taken to ensure reliable operation and long evity.
NOTE! Never mount waveguides with gasket anges
to each other! See Fig. 5. If this is done, there will be
water leakage and that will damage the LNB.
3
Fig. 3 LNB with N connector
and rubber sealed.
Fig. 2 Mounting screws and
O-ring
Fig. 4 Weather protection
cover.
Fig. 5 Waveguide gasket anges
with O-ring.
Application assistance
Your rst line of technical support would to take advan-
tage of SMWs wast knowledge and experience. Please
feel free to contact us at an early stage for free advise
on your application before you place an order. You’ll nd
our contact details on the back of this User Guide. We
welcome your enquiries:
• DC-power sizing:
Although we recommend that you use PC power supplies
as recommended in our quotations, a detailed calculation
to help you with your choice of power supply rating and
voltage drop over distance.
Please contact us for information.
Service
There are no user serviceable parts inside.
For factory service, contact SMW for an RMA number
before returning any material.
Materials returned without an RMA number will be refu-
sed. Standard warranty is 36 months.
4. Troubleshooting
First of all, make sure that the LNB input has correct DC
voltage. If there is a long cable feeding the LNB with
power that give as an resukt that DC has dropped under
the critical value, it may happen that the LNB will be un-
stable or not work at all. As an example a WDL LNB can
work on the ”Low band” output but not on the ”High band”
output if the DC Voltage is too low.
If the DC Voltage is OK but still a problem with the recei-
ved signal, then check if there is any line ampliers or
other products installed between the receiver and the LNB
and make a pass through of the signal to eliminate that
the problem has not to do with those items.
If the LNB is a switchable LNB ( 2-band or Q-PLL ), make
sure that switching voltage has correct level at the LNB
input and if switching with 22 kHz tone is used, that there
is nothing in between the receiver and the LNB that can
affect the 22 kHz tone in a negative way.
Next thing is if the LNB is installed in a large antenna
(>1,7 meter) and is a DRO type, the LNB can be satura-
ted and will then not give the calculated output level or a
distorted signal out. As a rule one can say that antennas
larger than 1,7 meter shall be used together with a PLL
LNB. It is also important to consider the gain of the LNB
though big antennas may need a LNB with low gain.
Please contact us for assistance or for help with calculate
the link budget.
SWEDISH MICROWAVE AB
Dynamovägen 5
S-59161 Motala
SWEDEN
Phone: +46 141 216135
info@smw.se
www.smw.se SMW LNB01, Rev. 03 2017-02
Specications are subject to change without notice.
General Terms: Orgalime S 2012. Products from Swedish Microwave AB are made for commercial use unless otherwise specied.
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