Subelement G: VHF-DSC Equipment & Comms— Topic :
Question 43G6
Element 7R (GMDSS-RO)Proper and legal VHF operations require all of these except?
Explanation
Proper and legal VHF operations require the operator to select the correct frequency (A), whether to operate simplex or duplex (B, though "alpha channel modes" refers to display settings, not transmission legality), and the appropriate power level (D) to comply with the minimum power rule.
However, **C) The correct bandwidth must be selected by the operator,** is generally not a direct operator responsibility in the same way. For most VHF/UHF amateur radios, especially for common FM voice communications, the bandwidth is determined by the selected modulation mode (e.g., FM, NFM, SSB, C4FM) and is largely fixed by the radio's design for that mode. Operators typically select the *mode*, and the radio automatically applies the appropriate bandwidth characteristics. There isn't usually a separate, explicit "bandwidth" control that the operator *must* select for legal or proper operation.
Related Questions
43G4 The “Scan” function is used to:43G5 Setting the squelch control to the end of its range without any noise being heard results in:44G1 Which of the following control selections may result in limited receiving range?44G2 While conducting routine communications using the wheelhouse VHF with a station 1 mile distant, your recommended power setting would be:44G3 Which of the following factors does not normally affect the range of VHF transmissions?