7R-A-44: VHF: Power and Range
7R-44G1:
Which of the following control selections may result in limited receiving range?
Setting the squelch control to its maximum level.
Setting the squelch control to its minimum level.
The power switch is set to the "high" output position, resulting in receiver overloading.
Setting the channel selection switch midway between channels 6 and 16.
7R-44G2:
While conducting routine communications using the wheelhouse VHF with a station 1 mile distant, your recommended power setting would be:
1 watt, day or night.
25 watts after dark.
25 watts during a clear sunny day.
1 watt using DSC at night.
7R-44G3:
Which factors normally determine the range of VHF transmissions:
Both b) and d)
Channel frequency
Power level
Vessel antenna height
7R-44G4:
Causes of much longer than normal VHF transmissions are:
Atmospheric ducting
Changing power from 1W to 25 W.
Ionospheric activity in layers F1/F2.
None of the above
7R-44G5:
Describing VHF transmissions as "line of sight" means:
Both b) and c) are true
VHF communications are effective only with nearby stations within visual range of the bridge.
Vessel antenna height will affect the radius of propagation.
The normal transmission range to a coast station is approximately 25 NM.
7R-44G6:
The effectiveness of VHF communications is maximized by:
All of the above
The adjustment of squelch for maximum receiver sensitivity.
Appropriate setting of the transmitter power.
Selecting an appropriate channel.
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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