Kantronics KAM, Инструкция по эксплуатации

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RFI
1
Radio Frequency Interference Statement
This equipment complies with the limits for a class B computing device in accordance with the
specifications in Subpart J of Part 15 of the FCC rules. These specifications are designed to mini-
mize radio frequency interference in a residential installation; however, there are no guarantee that
radio or television interference will not occur in any particular installation. If this equipment does
cause interference to radio or television reception, which can be determined by turning the equip-
ment off and on when the radio or television is on, the user encouraged to try to correct the inter-
ference by one of the following measures:
Reorient the radio or TV receiving antenna
Relocate the computer with respect to the receiver
Move the computer away from the receiver
Plug the computer into a different outlet, so that the computer and the receiver are on diffe–
rent branch circuits
If necessary the user should contact the dealer or an experienced radio/TV technician for addi-
tional suggestions. The user may find the following booklet prepared by the FCC helpful:
How to Identify and Resolve Radio-TV Interference Problems
This booklet is available from the U.S. Government Printing Office, Washington, D.C., 20402 by or-
dering Stock No. 004-00000345-4.
RFI Suppression
In moving to the world of digital communications via computer, a new dimension of RFI may be
encountered. In spite of the equipment manufactures' diligence, each new piece of electronic
equipment will react differently in each separate environment. Every amateur station will have irs
own unique layout, equipment variation and antenna installations. Experience has shown that
these differences are related to the total RF environment and my be causative factors in RFI in-
duced problems. The suggestions given here may assist in resolving RFI problems you may en-
counter in your "unique" station.
1. Use shielded cable for all connections between equipment.
2. Make all interconnecting cables as short as practical. A balance should be maintained between
cable length and equipment proximity. At times simply moving the video monitor one foot fur-
ther from an interface or other device will solve the "screen hash" problem.
3. Antenna runs should be kept away from equipment control lines and/or interconnecting cables.
If it is necessary for such lines to cross each other, they should do so at 90 degree angles.
4. Ground leads should be as short as possible and go to a GOOD EARTH GROUND.
5. Interconnecting cables appearing to act as radiators or antennas should be looped through a
toroid. Be certain toroids, if used, are designed for the frequency in use.