Question 7A2

To measure the Standing Wave Ratio (SWR) of an *entire* marine VHF antenna system, the SWR meter must be placed in a position to evaluate the impedance match of the transmitter against the combined transmission line and antenna. * **D is correct:** Inserting an SWR meter between the VHF radio (transmitter) and the coaxial transmission line connected to the antenna correctly places the meter to measure the SWR of the complete system. The "set" implies preparing the radio to transmit a low-power signal, which is necessary for the SWR meter to function and provide a reading. * **A is incorrect:** An artificial antenna (dummy load) is a resistive component designed to present a perfect 50-ohm match. Measuring SWR or power into a dummy load only tests the radio's output into a matched load; it provides no information about the actual marine VHF antenna system's SWR. * **B is incorrect:** While the placement of the SWR meter between the transmitter and the coaxial line connected to the antenna is correct, this option is an incomplete description of a test procedure, lacking the subsequent step needed to perform the measurement. Option D provides a more complete procedural start. * **C is incorrect:** Disconnecting the coaxial transmission line from the antenna creates an open circuit, which will always present an extremely high SWR (theoretically infinite). This measurement does not reflect the actual operating characteristics or match of the connected antenna system.