Sokkia SRX1, Руководство оператора, Страница: 25 / 184

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4. PRODUCT OUTLINE
Precautions regarding transmission
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For best results
•When using the On-demand Remote Control system, perform communication within a line-of-
sight distance of approximately 300m. The usable range becomes shorter when obstacles block
the line of sight, or devices other than the On-demand Remote Control system, such as PDAs or
computers, are used. Wood, glass and plastic will not impede communication but the usable
range becomes shorter. Moreover, wood, glass and plastic containing metal frames, plates, foil
and other heat shielding elements as well as coatings containing metallic powders may adversely
affect Bluetooth communication and concrete, reinforced concrete, and metal will render it
impossible. Use a vinyl or plastic cover to protect the instrument from rain and moisture.
•The direction of the Bluetooth antenna can have adverse effects upon usable range. For best
results make sure that the antennas of both the SRX and the companion device are as vertical
as possible and visible to one another. When this is not possible, better results can be obtained
by pointing the antenna vertically towards the ground.
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• Perform communication at a distance of 2m or more from electrical devices such as audio-visual
equipment and office automation equipment. In the case of microwave ovens, which are especially
susceptible to interference, this distance should be increased to 3m.
Moreover, operation near televisions and radios may lead to problems with reception.
• Ensure that cellular phones are at least 20cm from the SRX Bluetooth module during operation.
• Change location when proximity to a wireless device or broadcast station results in communication
failure.
When using the SRX near IEEE802.11b or IEEE802.11g standard wireless LAN devices or other
devices that operate on the 2.4GHz ISM band, interference may result, causing transmission speed
to slow or even disrupting the connection completely. Turn off all devices not being used.
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Reduced range due to atmospheric conditions
The radio waves used by the SRX may be absorbed or scattered by water and airborne moisture. The
signal may be weakened by exposure to rain, fog, and moisture from the human body with the limit of
usable range becoming much lower as a result. Moreover, as wireless devices lose signal strength
when close to the ground, perform communication at as high a position as possible.