F10F Series Booster User’s Manual
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8
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donor antenna.
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Installation donor antenna
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Notes:
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Do not install the donor antenna during the rainy day with lightning.
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Please follow the instructions to install the donor antenna.
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It is a must that the waterproof shall be done to connectors of donor
antenna and feeder lines.
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In order to avoid interference, please note that the donor antenna
should be far away from the following objects.
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Metal
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High-voltage line
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RF antenna
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High-voltage transformer
2) Booster is a two-way signal amplifier. So proper isolation between donor antenna and
server antenna is necessary in order to avoid self-oscillation. About the definition for
self-oscillation, take MIC and loudspeaker for example , if it is too close for each other,
it could make big noise. So the booster can run smoothly if the isolation between donor
antenna and server antenna is 15 dB higher than the gain of booster. For example, if
the booster gain is 50 dB, then the isolation between donor antenna and server
antenna should be 65 decibel.
If isolation cannot be achieved by the distance due to the limited conditions, we can use
the roof of the building or other barriers. If the barrier is concrete or brick wall, also donor
antenna and server antenna are in opposite direction, just one floor between up and
down stairs will be able to meet the isolation requirement.
3) Accessories selection: Pay attention to two points during selection the accessory due
to the booster belongs to high frequency communication system: frequency and
impedance. All accessories shall support booster frequencies from feeder line, antenna
and splitter to combiners etc. For example, the booster frequency is GSM900, so all
the accessories must support the GSM900 frequency. And the booster impedance is
50ohm, so the accessories shall all be 50ohm. To use any other impedance of coax will
put an extra load on your booster and shorten its life span.