A mismatched antenna system can degrade marine VHF radio performance. Antenna system matching can be analyzed by determining the Standing Wave Ratio (SWR). Which of the following is the best test procedure to determine the VHF antenna system SWR?
• Standing Wave Ratio (SWR) measures how well the antenna system is matched to the transmitter and feed line • To measure true SWR, the antenna system must be in its normal operating configuration (radio–coax–antenna) • The test instrument must be able to compare forward power and reflected power in the transmission line
• In which options is the antenna connected and operating as it normally would be at sea? • Which instruments can actually compare forward and reflected power to calculate SWR, rather than just show total power? • Which procedures avoid using dummy or artificial loads when the goal is to check the real antenna system’s matching?
• Does the setup include the actual VHF antenna and coax that you want to test? • Is the meter positioned between the transmitter and the antenna system, not disconnected from it? • Does the described meter measure both forward and reflected power (or SWR directly), rather than only RF power into a perfect 50 ohm load?
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