B-003-21: Exposure of human body to RF, safety precautions
B-003-21-01:
What should you do for safety when operating at 1270 MHz?
Keep antenna away from your eyes when RF is applied
Make sure that an RF leakage filter is installed at the antenna feed point
Make sure the standing wave ratio is low before you conduct a test
Never use a horizontally polarized antenna
B-003-21-02:
What should you do for safety if you put up a UHF transmitting antenna?
Make sure the antenna will be in a place where no one can get near it when you are transmitting
Make sure the antenna is near the ground to keep its RF energy pointing in the correct direction
Make sure you connect an RF leakage filter at the antenna feed point
Make sure that RF field screens are in place
B-003-21-03:
What should you do for safety, before removing the shielding on a UHF power amplifier?
Make sure the amplifier cannot accidentally be turned on
Make sure that RF leakage filters are connected
Make sure the antenna feed line is properly grounded
Make sure all RF screens are in place at the antenna feed line
B-003-21-04:
Why should you make sure the antenna of a hand-held transceiver is not close to your head when transmitting?
To reduce your exposure to the radio-frequency energy
To use your body to reflect the signal in one direction
To keep static charges from building up
To help the antenna radiate energy equally in all directions
B-003-21-05:
How should you position the antenna of a hand-held transceiver while you are transmitting?
Away from your head and away from others
Pointed towards the station you are contacting
Pointed away from the station you are contacting
Pointed down to bounce the signal off the ground
B-003-21-06:
How can exposure to a large amount of RF energy affect body tissue?
It heats the tissue
It causes radiation poisoning
It paralyzes the tissue
It produces genetic changes in the tissue
B-003-21-07:
Which body organ is the most likely to be damaged from the heating effects of RF radiation?
Eyes
Heart
Liver
Hands
B-003-21-08:
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?
It heats the tissue
It causes radiation poisoning
It causes blood flow to stop
It produces genetic changes in the tissue
B-003-21-09:
If you operate your amateur station with indoor antennas, what precautions should you take when you install them?
Locate the antennas as far away as possible from living spaces that will be occupied while you are operating
Position the antennas parallel to electrical power wires to take advantage of parasitic effects
Position the antennas along the edge of a wall where it meets the floor or ceiling to reduce parasitic radiation
Locate the antennas close to your operating position to minimize feed-line length
B-003-21-10:
Why should directional high-gain antennas be mounted higher than nearby structures?
So they will not direct RF energy toward people in nearby structures
So they will be dried by the wind after a heavy rain storm
So they will not damage nearby structures with RF energy
So they will receive more sky waves and fewer ground waves
B-003-21-11:
For best RF safety, where should the ends and center of a dipole antenna be located?
As high as possible to prevent people from coming in contact with the antenna
Near or over moist ground so RF energy will be radiated away from the ground
As close to the transmitter as possible so RF energy will be concentrated near the transmitter
Close to the ground so simple adjustments can be easily made without climbing a ladder
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