HamRadioSolutions EZMaster, Руководство пользователя

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EZMaster
EZMaster
User’s Guide Page 3 of 53
Radio Frequency Interference Statement
Note 1: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. There is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
•  Reorient or relocate the receiving antenna.
•  Increase the separation between the equipment and receiver.
•  Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced Radio/TV technician for help.
The user is cautioned that any changes or modifications not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment. The user is also cautioned that any peripheral device installed with this equipment must be
connected with a high-quality shielded cable to insure compliance with FCC limits.
Note 2: The shield of the cable, whether foil, braid, braid over foil, or double braid, must be properly terminated (connected)  to the
connector shell. This is usually accomplished by the use of a metal or back metalized plastic shell, but may be implemented by direct
contact, including soldering, with any metal portion of the connector itself. Experience has indicated that cable assemblies (with
connectors) advertised as “shielded” are not necessarily properly terminated, if terminated at all. Check cable construction to be sure.
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 hereafter may assist in resolving RFI problems:
• Use shielded cable for all connections between equipments. 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 ferrite toroid. Be certain that
toroids, when used, are designed for the frequency in use.