B-007-07: VHF and UHF, sporadic-E, aurora, ducting
B-007-07-01:
Which ionospheric region most affects sky-wave propagation on the 6 metre band?
The E region
The F2 region
The F1 region
The D region
B-007-07-02:
What effect does tropospheric bending have on 2-metre radio waves?
It lets you contact stations farther away
It causes them to travel shorter distances
It garbles the signal
It reverses the sideband of the signal
B-007-07-03:
What causes tropospheric ducting of radio waves?
A temperature inversion
Lightning between the transmitting and receiving stations
An aurora to the north
A very low pressure area
B-007-07-04:
That portion of the radiation kept close to the earth's surface due to bending in the atmosphere is called the:
tropospheric wave
inverted wave
ground wave
ionospheric wave
B-007-07-05:
What is a sporadic-E condition?
Patches of dense ionization at E-region height
Partial tropospheric ducting at E-region height
Variations in E-region height caused by sunspot variations
A brief decrease in VHF signals caused by sunspot variations
B-007-07-06:
On which amateur frequency band is the extended-distance propagation effect of sporadic-E most often observed?
6 metres
160 metres
20 metres
2 metres
B-007-07-07:
In the northern hemisphere, in which direction should a directional antenna be pointed to take maximum advantage of auroral propagation?
North
East
West
South
B-007-07-08:
Where in the ionosphere does auroral activity occur?
At E-region height
At F-region height
In the equatorial band
At D-region height
B-007-07-09:
Which emission modes are best for auroral propagation?
CW and SSB
RTTY and AM
FM and CW
SSB and FM
B-007-07-10:
Excluding enhanced propagation modes, what is the approximate range of normal VHF tropospheric propagation?
800 km (500 miles)
2400 km (1500 miles)
3200 km (2000 miles)
1600 km (1000 miles)
B-007-07-11:
What effect is responsible for propagating a VHF signal over 800 km (500 miles)?
Tropospheric ducting
Faraday rotation
D-region absorption
Moon bounce
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