FCC E3B - 无线电波传播

#E3B01🔗

Where is transequatorial propagation (TEP) most likely to occur?

跨赤道传播（TEP）最有可能发生在哪里？

Between points separated by 2,000 miles to 3 ,000 miles over a path perpendicular to the geomagnetic equator

在垂直于地磁赤道的路径上相距 2,000 英里到 3,000 英里的点之间

✓ 正确答案

Between points located 1,500 miles to 2,000 miles apart on the geomagnetic equator

地磁赤道上相距 1,500 英里到 2,000 英里的点之间

Between points located at each other’s antipode

位于彼此对跖点的点之间

Through the region where the terminator crosses the geographic equator

通过明暗界线穿过地理赤道的区域

#E3B02🔗

What is the approximate maximum range for signals using transequatorial propagation?

使用越赤道传播的信号的最大范围大约是多少？

1,000 miles

1,000 英里

2,500 miles

2,500 英里

5 ,000 miles

5,000 英里

✓ 正确答案

7,500 miles

7,500 英里

#E3B03🔗

At what time of day is transequatorial propagation most likely to occur?

一天中的什么时间最有可能发生跨赤道传播？

Morning

早上

Noon

中午

Afternoon or early evening

下午或傍晚

✓ 正确答案

Late at night

深夜

#E3B04🔗

What are “extraordinary” and “ordinary” waves?

什么是“非凡”和“普通”波浪？

Extraordinary waves exhibit rare long-skip propagation, compared to ordinary waves, which travel shorter distances

与传播距离较短的普通波相比，异常波表现出罕见的长跳跃传播

Independently propagating, elliptically polarized waves created in the ionosphere

在电离层中产生的独立传播的椭圆偏振波

✓ 正确答案

Long-path and short-path waves

长程波和短程波

Refracted rays and reflected waves

折射光线和反射波

#E3B05🔗

Which of the following paths is most likely to support long-distance propagation on 160 meters?

以下哪条路径最有可能支持 160 米长距离传播？

A path entirely in sunlight

完全沐浴在阳光下的小路

Paths at high latitudes

高纬度地区的路径

A direct north-south path

一条直接的南北路径

A path entirely in darkness

一条完全黑暗的道路

✓ 正确答案

#E3B06🔗

On which of the following amateur bands is long-path propagation most frequent?

以下哪个业余频段的长路径传播最频繁？

160 meters and 80 meters

160米和80米

40 meters and 20 meters

40米和20米

✓ 正确答案

10 meters and 6 meters

10米和6米

6 meters and 2 meters

6米和2米

#E3B07🔗

What effect does lowering a signal’s transmitted elevation angle have on ionospheric HF skip propagation?

降低信号的发射仰角对电离层高频跳跃传播有何影响？

Faraday rotation becomes stronger

法拉第旋转变得更强

The MUF decreases

MUF 降低

The distance covered by each hop increases

每跳所覆盖的距离增加

✓ 正确答案

The critical frequency increases

临界频率增加

#E3B08🔗

How does the maximum range of ground-wave propagation change when the signal frequency is increased?

当信号频率增加时，地波传播的最大范围如何变化？

It stays the same

它保持不变

It increases

它增加了

It decreases

它减少了

✓ 正确答案

It peaks at roughly 8 MHz

峰值频率约为 8 MHz

#E3B09🔗

At what time of year is sporadic-E propagation most likely to occur?

一年中的什么时间最有可能发生零星 E 传播？

Around the solstices, especially the summer solstice

夏至前后，尤其是夏至

✓ 正确答案

Around the solstices, especially the winter solstice

夏至前后，尤其是冬至

Around the equinoxes, especially the spring equinox

春分前后，尤其是春分

Around the equinoxes, especially the fall equinox

春分前后，特别是秋分

#E3B10🔗

What is the effect of chordal-hop propagation?

弦跳传播的效果是什么？

The signal experiences less loss compared to multi -hop propagation, which uses Earth as a reflector

与使用地球作为反射器的多跳传播相比，信号遭受的损失更少

✓ 正确答案

The MUF for chordal-hop propagation is much lower than for normal skip propagation

弦跳传播的 MUF 远低于正常跳跃传播

Atmospheric noise is reduced in the direction of chordal-hop propagation

大气噪声在弦跳传播方向上减少

Signals travel faster along ionospheric chords

信号沿着电离层弦传播得更快

#E3B11🔗

At what time of day is sporadic-E propagation most likely to occur?

一天中的什么时间最有可能发生零星-E 传播？

Between midnight and sunrise

午夜至日出之间

Between sunset and midnight

日落和午夜之间

Between sunset and sunrise

日落和日出之间

Between sunrise and sunset

日出和日落之间

✓ 正确答案

#E3B12🔗

What is chordal-hop propagation?

什么是弦跳传播？

Propagation away from the great circle bearing between stations

远离站点间大圆方位角的传播

Successive ionospheric refractions without an intermediate reflection from the ground

连续的电离层折射，没有来自地面的中间反射

✓ 正确答案

Propagation across the geomagnetic equator

穿过地磁赤道的传播

Signals reflected back toward the transmitting station

信号反射回发射站

#E3B13🔗

What type of polarization is supported by ground-wave propagation?

地波传播支持什么类型的偏振？

Vertical

垂直

✓ 正确答案

Horizontal

卧式

Circular

圆形

Elliptical

椭圆形

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FCC E3B - 无线电波传播

小节 E3B：无线电波传播