FCC E2A - 电台操作实践

#E2A01🔗

What is the direction of an ascending pass for an amateur satellite?

业余卫星的上升经过方向是什么？

From west to east

从西到东

From east to west

从东到西

From south to north

从南到北

✓ 正确答案

From north to south

从北到南

#E2A02🔗

Which of the following is characteristic of an inverting linear transponder?

以下哪项是反向线性应答器的特性？

Doppler shift is reduced because the uplink and downlink shifts are in opposite directions

由于上下行频移方向相反，多普勒频移减小

Signal position in the band is reversed

频带中的信号位置颠倒

Upper sideband on the uplink becomes lower sideband on the downlink, and vice versa

上行链路上的上边带变为下行链路上的下边带，反之亦然

All these choices are correct

所有这些选项都是正确的

✓ 正确答案

#E2A03🔗

How is an upload signal processed by an inverting linear transponder?

反相线性转发器如何处理上传信号？

The signal is detected and remodulated on the reverse sideband

信号在反边带上被检测和重新调制

The signal is passed through a nonlinear filter

信号通过非线性滤波器

The signal is reduced to I and Q components, and the Q component is filtered out

信号减少为I和Q分量，Q分量被滤除

The signal is mixed with a local oscillator signal and the difference product is transmitted

该信号与本地振荡器信号混合并传输差值乘积

✓ 正确答案

#E2A04🔗

What is meant by the “mode” of an amateur radio satellite?

业余无线电卫星的“模式”是什么意思？

Whether the satellite is in a low earth or geostationary orbit

卫星是否处于近地轨道或地球静止轨道

The satellite’s uplink and downlink frequency bands

卫星上下行频段

✓ 正确答案

The satellite’s orientation with respect to the Earth

卫星相对于地球的方向

Whether the satellite is in a polar or equatorial orbit

卫星是否在极地轨道或赤道轨道

#E2A05🔗

What do the letters in a satellite’s mode designator specify?

卫星模式指示符中的字母表示什么？

Power limits for uplink and downlink transmissions

上行链路和下行链路传输的功率限制

The location of the ground control station

地面控制站位置

The polarization of uplink and downlink signals

上下行信号的极化

The uplink and downlink frequency ranges

上行和下行频率范围

✓ 正确答案

#E2A06🔗

What are Keplerian elements?

什么是开普勒元素？

Parameters that define the orbit of a satellite

定义卫星轨道的参数

✓ 正确答案

Phase reversing elements in a Yagi antenna

八木天线中的相位反转元件

High-emission heater filaments used in magnetron tubes

磁控管中使用的高发射加热器丝

Encrypting codes used for spread spectrum modulation

用于扩频调制的加密代码

#E2A07🔗

Which of the following types of signals can be relayed through a linear transponder?

以下哪种类型的信号可以通过线性转发器中继？

FM and CW

调频和连续波

SSB and SSTV

SSB 和 SSTV

PSK and packet

PSK 和数据包

All these choices are correct

所有这些选项都是正确的

✓ 正确答案

#E2A08🔗

Why should effective radiated power (ERP) be limited to a satellite that uses a linear transponder?

为什么有效辐射功率 (ERP) 仅限于使用线性转发器的卫星？

To prevent creating errors in the satellite telemetry

防止卫星遥测中产生错误

To avoid reducing the downlink power to all other users

避免减少所有其他用户的下行链路功率

✓ 正确答案

To prevent the satellite from emitting out-of-band signals

防止卫星发射带外信号

To avoid interfering with terrestrial QSOs

避免干扰地面 QSO

#E2A09🔗

What do the terms “L band” and “S band” specify?

术语“L 波段”和“S 波段”具体指什么？

The 23 - and 13 -centimeter bands

23 厘米和 13 厘米带

✓ 正确答案

The 2-meter and 70-centimeter bands

2米和70厘米带

FM and digital store-and-forward systems

FM 和数字存储转发系统

Which sideband to use

使用哪个边带

#E2A10🔗

What type of satellite appears to stay in one position in the sky?

哪种类型的卫星似乎停留在天空中的一个位置？

HEO

Geostationary

对地静止

✓ 正确答案

Geomagnetic

地磁

LEO

低地轨道

#E2A11🔗

What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?

可以使用什么类型的天线来最小化自旋调制和法拉第旋转的影响？

A linearly polarized antenna

线极化天线

A circularly polarized antenna

圆极化天线

✓ 正确答案

An isotropic antenna

各向同性天线

A log-periodic dipole array

对数周期偶极子阵列

#E2A12🔗

What is the purpose of digital store-and-forward functions on an amateur radio satellite?

业余无线电卫星上的数字存储转发功能的目的是什么？

To upload operational software for the transponder

上传应答器的操作软件

To delay download of telemetry between satellites

延迟卫星之间遥测数据的下载

To hold digital messages in the satellite for later download

在卫星中保存数字消息以供以后下载

✓ 正确答案

To relay messages between satellites

在卫星之间转发消息

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FCC E2A - 电台操作实践

小节 E2A：电台操作实践