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Test Report for Koscom Universal LNBs

Koscom Universal LNBs

LNB’s with noise figures of 0.3 dB have been around for some time. The Kosom series of LNB’s apart from the other is its large product variety. In addition to the standard offerings from the manufacturer including Single, Twin, Quattro and Quad LNB’s, Koscom also has an Octo universal LNB with eight outputs, plus Single, Twin and Quad monoblock LNB’s with one, two and four outputs for reception of Astra and Hotbird and, last but not least, a Quad terrestrial LNB that not only can be used for satellite reception but also provides four outputs from an analog antenna signal.

The signal is simply divided at the other end of the cable using a simple splitter that separates the antenna and satellite signal. This is a clever idea for all those who want satellite reception but also don’t want to do without their good old terrestrial TV signals. Even just looking at the Koscom series of LNB’s for the first time we felt that they were well constructed.

This was confirmed once we had a closer look at them. While the Twin, Quattro, Quad and Octo LNB’s came with plastic caps to protect the connectors from moisture, this problem with the single and monoblock LNB’s was solved using rubber grommets. Any LNB that can be installed on a 40mm mount makes installation on any offset antenna a simple procedure. While the Single, Twin, Quattro, Quad, Octo and Monoblock Single LNB’s already come from the manufacturer with a 40mm feed, the Monoblock twin and quad LNB’s are 23mm in size although adapters for 40mm are included.

The feed itself, the only opening in the LNB housing, is protected from moisture by a stable plastic cap that once again proves that you don’t need to use a feed cover made out of paper thin foil to achieve low noise figures. The receivable frequency range for both bands is 10.7 to 11.7 GHz and 11.7 to 12.75 GHz while switching between bands is done with a 22 KHz signal with a tolerance of +/- 4 KHz. Polarization control is handled by switching between 14 and 18 volts with tolerances of 10.5 to 14.2 volts for vertical polarization and 15.5 to 21 volts for horizontal polarization. Every receiver available today should have no trouble working with these LNB’s. The conversion gain for the Koscom series of LNB’s lies between 50-62 dB depending on themodel. The connectors are standard “F” type and are easy to reach in all models including to Octo LNB.

The Koscom LNB’s had to prove themselves in a practical test; two Invacom LNB’s were used in a direct comparison. The typical satellite system installed by a user has steadily gotten smaller over the years thanks to the ever-stronger DTH satellites that are being launched into orbit. When dealing with motorized or multifeed systems, the selected LNB will often determine whether or not one or more satellites on the edge of a footprint can be received. The signal strength of modern DTH satellites typically falls off more rapidly as you near the edge of the satellite’s footprint than with older satellites. These MBC channels are interesting because they broadcast many movies, talk shows and news programs from the larger US networks in their original language (occasionally) also with Arabic subtitles) and in the clear.

The Koscom LNB’s had to also be directly compared with the Invacom LNB’s. The observed reception values were nearly identical although when rain set in the Koscom LNB’s demonstrated a higher signal stability while the Invacoms experienced occasionally strong signal dropouts. There are no negative surprises in the monoblock LNB’s. The Koscom LNB’s can easily compete with the other 0.3 dB LNB’s on the market today. The large available product variety should allow anyone to find the LNB that fits their needs. The workmanship is excellent.

Model : Koscom Function: Universal Single, Twin, Quattro, Quad, Octo, Single Monoblock, Twin Monoblock, Quad Monoblock LNB with 0.3dB Noise Figure Input Frequency Range : 10.7~11.7 GHz/ 11.7~12.75 GHz IF Frequency Range : 950~1950 MHz/ 1100~2150 MHz LO Frequency : 9.75GHz 10.6GHz Conversion Gain : 50~62db Band Switching : 22 KHz Polarization Switching : 14/18V (10.5~14.2V and 15.5~21V) Noise Figure : 0.3db (Typ.) Connectors : 75 Ohm F Type (female) DiSEqC 1.0 : Yes (with the Monoblock LNB)



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