Station Assembly, Practice and Safety
electrical hazards, electrical safety, security
How could you best keep unauthorized persons from using your amateur station at home?
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Correct AnswerUse a key-operated on/off switch in the main power line
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Use a carrier-operated relay in the main power line
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Put a "Danger - High Voltage" sign in the station
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Put fuses in the main power line
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How could you best keep unauthorized persons from using a mobile amateur station in your car?
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Tune the radio to an unused frequency when you are done using it
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Turn the radio off when you are not using it
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Correct AnswerDisconnect the microphone when you are not using it
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Put a "Do not touch" sign on the radio
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Why would you use a key- operated on/off switch in the main power line of your station?
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For safety, in case the main fuses fail
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To keep the power company from turning off your electricity during an emergency
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For safety, to turn off the station in the event of an emergency
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Correct AnswerTo keep unauthorized persons from using your station
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Why would there be a switch in a highvoltage power supply to turn off the power if its cabinet is opened?
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Correct AnswerTo keep anyone opening the cabinet from getting shocked by dangerous high voltages
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To keep dangerous RF radiation from leaking out through an open cabinet
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To keep dangerous RF radiation from coming in through an open cabinet
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To turn the power supply off when it is not being used
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How little electrical current flowing through the human body can be fatal?
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Approximately 10 amperes
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More than 20 amperes
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Current flow through the human body is never fatal
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Correct AnswerAs little as 1/10 of an ampere
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Which body organ can be fatally affected by a very small amount of electrical current?
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Correct AnswerThe heart
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The brain
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The liver
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The lungs
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What is the minimum voltage which is usually dangerous to humans?
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100 volts
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1000 volts
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2000 volts
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Correct Answer30 volts
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What should you do if you discover someone who is being burned by high voltage?
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Wait for a few minutes to see if the person can get away from the high voltage on their own, then try to help
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Immediately drag the person away from the high voltage
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Correct AnswerTurn off the power, call for emergency help and give CPR if needed
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Run from the area so you won't be burned too
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What is the safest method to remove an unconscious person from contact with a high voltage source?
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Correct AnswerTurn off the high voltage switch beforere moving the person from contact with the source
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Wrap the person in a blanket and pull him to a safe area
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Call an electrician
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Remove the person by pulling an arm or a leg
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Before checking a fault in a mains operated power supply unit, it would be safest to First:
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Correct Answerturn off the power and remove power plug
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short out leads of filter capacitor
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check action of capacitor bleeder resistance
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remove and check fuse from power supply
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Fault finding in a power supply of an amateur transmitter while the supply is operating is not a recommended technique because of the risk of:
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Correct Answerelectric shock
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damaging the transmitter
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overmodulation
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blowing the fuse
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