Plustek MobileOffice D28 User Manual page 46

Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment to an outlet on a circuit different from that which the
receiver is connected.
Shielded interconnect cables and shielded power cord which are supplied
with this equipment must be employed with this equipment to ensure
compliance with the pertinent RF emission limits governing this device.
Consult the dealer or an experienced radio/TV technician for help if the
conditions persist.
Changes or modifications not expressly approved by the manufacturer or
authorized service center could void the user's authority to operate this
equipment.
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