Kantronics MT1200, User Manual

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RFI Suppression
In moving to the world of digital communications via computers, a new dimension of RFI
may be encountered. In spite of the equipment manufacturers’ diligence, each new
piece of electronic equipment will react differently in each separate environment. Every
amateur station will have its own unique layout, equipment variation, and antenna
installations. Experience has shown that these differences are related to the total RF
environment, and may be causative factors in RFI induced problems. The suggestions
given here may assist in resolving RFI problems:
•
Use shielded cable for all connections between equipment. See note 2 above
•
Make all interconnecting cables as short as practical
•
A balance should be maintained between cable length and equipment proximity.
At times simply routing interface cables away from the video monitor or other
devices, will solve a “screen hash” or electrical noise problem
•
Feed-lines to antennas 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
°
angles
•
Ground leads should be as short as possible and go to an EARTH GROUND
•
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
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