FCC T8B - 调制模式与通信方式

#T8B01🔗

What telemetry information is typically transmitted by satellite beacons?

卫星信标通常传输哪些遥测信息？

The signal strength of received signals

接收信号的信号强度

Time of day accurate to plus or minus 1/10 second

一天中的时间精确到正负 1/10 秒

Health and status of the satellite

卫星的健康和状态

✓ 正确答案

All these choices are correct

这些选项都是正确的

#T8B02🔗

What is the impact of using excessive effective radiated power on a satellite uplink?

使用过多的有效辐射功率对卫星上行链路有何影响？

Possibility of commanding the satellite to an improper mode

命令卫星进入不正确模式的可能性

Blocking access by other users

阻止其他用户访问

✓ 正确答案

Overloading the satellite batteries

卫星电池过载

Possibility of rebooting the satellite control computer

重新启动卫星控制计算机的可能性

#T8B03🔗

Which of the following are provided by satellite tracking programs?

以下哪些是卫星跟踪程序提供的？

Maps showing the real-time position of the satellite track over Earth

显示地球上卫星轨道实时位置的地图

The time, azimuth, and elevation of the start, maximum altitude, and end of a pass

一次通过的开始、最大高度和结束的时间、方位角和仰角

The apparent frequency of the satellite transmission, including effects of Doppler shift

卫星传输的表观频率，包括多普勒频移的影响

All these choices are correct

这些选项都是正确的

✓ 正确答案

#T8B04🔗

What mode of transmission is commonly used by amateur radio satellites?

业余无线电卫星常用的传输方式是什么？

SSB

单边带

调频

CW/data

连续波/数据

All these choices are correct

这些选项都是正确的

✓ 正确答案

#T8B05🔗

What is a satellite beacon?

什么是卫星信标？

The primary transmit antenna on the satellite

卫星上的主要发射天线

An indicator light that shows where to point your antenna

指示天线指向何处的指示灯

A reflective surface on the satellite

卫星上的反射面

A transmission from a satellite that contains status information

来自卫星的包含状态信息的传输

✓ 正确答案

#T8B06🔗

Which of the following are inputs to a satellite tracking program?

以下哪些是卫星跟踪程序的输入？

The satellite transmitted power

卫星发射功率

The Keplerian elements

开普勒元素

✓ 正确答案

The last observed time of zero Doppler shift

最后观测到零多普勒频移的时间

All these choices are correct

所有这些选项都是正确的

#T8B07🔗

What is Doppler shift in reference to satellite communications?

什么是卫星通信的多普勒频移？

A change in the satellite orbit

卫星轨道的变化

A mode where the satellite receives signals on one band and transmits on another

卫星在一个波段接收信号并在另一个波段发射信号的模式

An observed change in signal frequency caused by relative motion between the satellite and Earth station

观察到的卫星和地球站之间的相对运动引起的信号频率变化

✓ 正确答案

A special digital communications mode for some satellites

一些卫星的特殊数字通信方式

#T8B08🔗

What does it mean if a satellite is operating in U/V mode?

如果卫星在 U/V 模式下运行意味着什么？

The satellite uplink is in the 15-meter band and the downlink is in the 10-meter band

卫星上行链路在15米波段，下行链路在10米波段

The satellite uplink is in the 70 - centimeter band and the downlink is in the 2 -meter band

卫星上行在70 厘米波段，下行在2米波段

✓ 正确答案

The satellite operates using ultraviolet frequencies

卫星使用紫外线频率运行

The satellite frequencies are usually variable

卫星频率通常是可变的

#T8B09🔗

What causes spin fading of satellite signals?

卫星信号自旋衰落的原因是什么？

Circular polarized noise interference radiated from the sun

太阳辐射的圆偏振噪声干扰

Rotation of the satellite and its antennas

卫星及其天线的旋转

✓ 正确答案

Doppler shift of the received signal

接收信号的多普勒频移

Interfering signals within the satellite uplink band

卫星上行链路频段内的干扰信号

#T8B10🔗

What does the term LEO mean in reference to communication satellites?

“LEO”一词对于通信卫星而言意味着什么？

Low Energy Orbit, which conserves battery power

低能量轨道，节省电池电量

Low Elevation Orbit, which appears close to the horizon from the earth station

低仰角轨道，从地球站看来接近地平线

Low Equilibrium Orbit, which has a slightly unstable period

低平衡轨道，周期稍不稳定

Low Earth Orbit, which has a period of around 100 minutes

近地轨道，周期约为100分钟

✓ 正确答案

#T8B11🔗

Who is permitted to receive telemetry from an amateur radio satellite?

谁可以接收业余无线电卫星的遥测数据？

Anyone

任何人

✓ 正确答案

Only the satellite control operator

仅卫星主控操作员

Only the control operator or a licensed radio amateur who has received the encryption key from the control operator

仅主控操作员或已从主控操作员处收到加密密钥的持照无线电业余爱好者

Only a licensed radio amateur who has received the encryption key from AMSAT

只有获得 AMSAT 发送的加密密钥的持证无线电爱好者

#T8B12🔗

Which of the following is a way to determine whether your satellite uplink power into a linear transponder satellite is neither too low nor too high?

以下哪项是确定您的线性转发器卫星的卫星上行链路功率是否不太低或太高的方法？

Check your signal strength report in the telemetry data

检查遥测数据中的信号强度报告

Listen for distortion on your downlink signal

聆听下行链路信号是否失真

Your signal strength on the downlink should be about the same as the beacon

您在下行链路上的信号强度应与信标大致相同

✓ 正确答案

Compare your signal to others on the downlink using an internet SDR receiver

使用互联网 SDR 接收器将您的信号与下行链路上的其他信号进行比较

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FCC T8B - 调制模式与通信方式

小节 T8B：调制模式与通信方式