Station Assembly, Practice and Safety
exposure of human body to RF, safety precautions
What should you do for safety when operating at 1270 MHz?
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Correct AnswerKeep antenna away from your eyes when RF is applied
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Make sure that an RF leakage filter is installed at the antenna feed point
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Make sure the standing wave ratio is low before you conduct a test
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Never use a horizontally polarized antenna
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What should you do for safety if you put up a UHF transmitting antenna?
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Make sure the antenna is near the ground to keep its RF energy pointing in the correct direction
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Correct AnswerMake sure the antenna will be in a place where no one can get near it when you are transmitting
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Make sure you connect an RF leakage filter at the antenna feed point
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Make sure that RF field screens are in place
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What should you do for safety, before removing the shielding on a UHF power amplifier?
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Make sure that RF leakage filters are connected
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Make sure the antenna feed line is properly grounded
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Correct AnswerMake sure the amplifier cannot accidentally be turned on
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Make sure all RF screens are in place at the antenna feed line
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Why should you make sure the antenna of a hand-held transceiver is not close to your head when transmitting?
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To use your body to reflect the signal in one direction
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Correct AnswerTo reduce your exposure to the radiofrequency energy
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To keep static charges from building up
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To help the antenna radiate energy equally in all directions
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How should you position the antenna of a hand-held transceiver while you are transmitting?
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Pointed towards the station you are contacting
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Pointed away from the station you are contacting
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Pointed down to bounce the signal off the ground
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Correct AnswerAway from your head and away from others
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How can exposure to a large amount of RF energy affect body tissue?
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It causes radiation poisoning
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It paralyzes the tissue
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It produces genetic changes in the tissue
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Correct AnswerIt heats the tissue
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Which body organ is the most likely to be damaged from the heating effects of RF radiation?
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Heart
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Correct AnswerEyes
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Liver
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Hands
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Depending on the wavelength of the signal, the energy density of the RF field, and other factors, in what way can RF energy affect body tissue?
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It causes radiation poisoning
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It causes blood flow to stop
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It produces genetic changes in the tissue
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Correct AnswerIt heats the tissue
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If you operate your amateur station with indoor antennas, what precautions should you take when you install them?
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Position the antennas parallel to electrical power wires to take advantage of parasitic effects
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Position the antennas along the edge of a wall where it meets the floor or ceiling to reduce parasitic radiation
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Correct AnswerLocate the antennas as far away as possible from living spaces that will be occupied while you are operating
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Locate the antennas close to your operating position to minimize feed-line length
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Why should directional high- gain antennas be mounted higher than nearby structures?
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Correct AnswerSo they will not direct RF energy toward people in nearby structures
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So they will be dried by the wind after a heavy rain storm
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So they will not damage nearby structures with RF energy
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So they will receive more sky waves and fewer ground waves
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For best RF safety, where should the ends and center of a dipole antenna be located?
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Correct AnswerAs high as possible to prevent people from coming in contact with the antenna
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Near or over moist ground so RF energy will be radiated away from the ground
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As close to the transmitter as possible so RF energy will be concentrated near the transmitter
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Close to the ground so simple adjustments can be easily made without climbing a ladder
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