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Subelement 7
Feedlines - Matching and Antennas
Section 7-06
losses in real antenna systems, effective radiated power
A transmitter has an output of 100 watts. The cable and connectors have a composite loss of 3 dB, and the antenna has a gain of 6 dB. What is the Effective Radiated Power?
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350 watts
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Correct Answer200 watts
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400 watts
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300 watts
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As standing wave ratio rises, so does the loss in the transmission line. This is caused by:
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high antenna currents
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high antenna voltage
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leakage to ground through the dielectric
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Correct Answerdielectric and conductor heat losses
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What is the Effective Radiated Power of an amateur transmitter, if the transmitter output power is 200 watts, the transmission line loss is 5 watts, and the antenna power gain is 3 dB?
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197 watts
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228 watts
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178 watts
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Correct Answer390 watts
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Effective Radiated Power means the:
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Correct Answertransmitter output power, minus line losses, plus antenna gain
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power supplied to the antenna before the modulation of the carrier
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power supplied to the feedline plus antenna gain
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ratio of signal output power to signal input power
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A transmitter has an output power of 200 watts. The coaxial and connector losses are 3 dB in total, and the antenna gain is 9 dB. What is the approximate Effective Radiated Power of this system?
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3200 watts
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1600 watts
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Correct Answer800 watts
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400 watts
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A transmitter has a power output of 100 watts. There is a loss of 1.30 dB in the transmission line, a loss of 0.2 dB through the transmatch, and a gain of 4.50 dB in the antenna. The Effective Radiated Power (ERP) is:
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800 watts
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400 watts
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Correct Answer200 watts
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100 watts
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If the overall gain of an amateur station is increased by 3 dB the ERP (Effective Radiated Power) will:
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decrease by 3 watts
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remain the same
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Correct Answerdouble
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be cut in half
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A transmitter has a power output of 125 watts. There is a loss of 0.8 dB in the transmission line, 0.2 dB in the transmatch, and a gain of 10 dB in the antenna. The Effective Radiated Power (ERP) is:
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1250
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1125
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134
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Correct Answer1000
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If a 3 dB gain antenna is replaced with a 9 dB gain antenna, with no other changes, the Effective Radiated Power (ERP) will increase by:
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6
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Correct Answer4
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1.5
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2
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A transmitter has an output of 2000 watts PEP. The transmission line, connectors and transmatch have a composite loss of 1 dB, and the gain from the stacked Yagi antenna is 10 dB. What is the Effective Radiated Power (ERP) in watts PEP?
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18 000
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20 000
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2009
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Correct Answer16 000
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A transmitter has an output of 1000 watts PEP. The coaxial cable, connectors and transmatch have a composite loss of 1 dB, and the antenna gain is 10 dB. What is the Effective Radiated Power (ERP) in watts PEP?
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1009
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10 000
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Correct Answer8000
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9000
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