FCC T8D - 调制模式与通信方式

#T8D01🔗

Which of the following is a digital communications mode?

以下哪项是数字通信方式？

Packet radio

分组无线电

IEEE 802.11

FT8

All these choices are correct

这些选项都是正确的

✓ 正确答案

#T8D02🔗

What is FT8?

FT8是什么？

A wideband FM voice mode

宽带FM语音模式

A digital mode capable of low signal -to- noise operation

能够进行低信噪比操作的数字模式

✓ 正确答案

An eight-channel multiplex mode for FM repeaters

调频中继器的八通道复用模式

A digital slow-scan TV mode with forward error correction and automatic color compensation

具有前向纠错和自动色彩补偿功能的数字慢扫描电视模式

#T8D03🔗

What kind of data can be transmitted by APRS?

APRS可以传输什么样的数据？

GPS position data

GPS位置数据

Text messages

短信

Weather data

天气数据

All these choices are correct

这些选项都是正确的

✓ 正确答案

#T8D04🔗

What is meant by the term "NTSC?"

术语“NTSC”是什么意思？

A digital transmission standard for encrypting data

用于加密数据的数字传输标准

A special mode for satellite uplink

卫星上行特殊模式

An analog fast - scan color TV signal

模拟快速扫描彩色电视信号 _

✓ 正确答案

A frame compression scheme for TV signals

一种电视信号的帧压缩方案

#T8D05🔗

Which of the following is an application of APRS?

以下哪项是 APRS 的应用？

Providing real -time tactical digital communications in conjunction with a map showing the locations of stations

结合显示站点位置的地图提供实时战术数字通信 _ _

✓ 正确答案

Automatically showing the number of packets transmitted via PACTOR during a specific time interval

自动显示特定时间间隔内通过 PACTOR 传输的数据包数量

Providing voice over internet connection between repeaters

在中继器之间提供互联网语音连接

Providing information on the number of stations signed into a repeater

提供有关登录中继器的站点数量的信息

#T8D06🔗

What does the abbreviation "PSK" mean?

缩写“PSK”是什么意思？

Pulse Shift Keying

脉冲移位键控

Phase Shift Keying

相移键控

✓ 正确答案

Packet Sampled Keying

数据包采样键控

Power Sampled Keying

功率采样键控

#T8D07🔗

Which of the following describes DMR?

以下哪项描述了 DMR？

A technique for time - multiplexing two digital voice signals on a single 12 . 5 kHz repeater channel

一种在单个12 . _ _ _ _ _ _ 5 kHz中继频道

✓ 正确答案

An automatic position tracking mode for FM mobiles communicating through repeaters

一种用于通过中继器通信的 FM 手机的自动位置跟踪模式

An automatic computer logging technique for hands-off logging when communicating while operating a vehicle

一种自动计算机记录技术，用于在操作车辆时进行通信时进行自动记录

A digital technique for transmitting on two repeater inputs simultaneously for automatic error correction

一种同时在两个中继器输入上传输以进行自动纠错的数字技术

#T8D08🔗

Which of the following is included in packet radio transmissions?

分组无线电传输包括以下哪项？

A checksum that permits error detection

允许错误检测的校验和

A header that contains the call sign of the station to which the information is being sent

一个标头，其中包含要向其发送信息的电台的呼号

Automatic repeat request in case of error

出错时自动重复请求

All these choices are correct

这些选项都是正确的

✓ 正确答案

#T8D09🔗

What is CW?

什么是CW？

A type of electromagnetic propagation

电磁传播的一种

A digital mode used primarily on 2-meter FM

主要用于 2 米 FM 的数字模式

Error correction for digital transmission using code words

使用码字进行数字传输的纠错

Another name for a Morse code transmission

摩尔斯电码传输的别称

✓ 正确答案

#T8D10🔗

Which of the following operating activities is supported by digital mode software in the WSJT-X software suite?

WSJT-X 软件套件中的数字模式软件支持以下哪些操作活动？

Earth-Moon-Earth

地球-月球-地球

Weak signal propagation beacons

弱信号传播信标

Meteor scatter

流星散

All these choices are correct

这些选项都是正确的

✓ 正确答案

#T8D11🔗

What is the role of ARQ in a transmission system?

ARQ在传输系统中的作用是什么？

A special transmission format limited to video signals

一种仅限于视频信号的特殊传输格式

A system used to encrypt command signals to an amateur radio satellite

用于加密发送给业余无线电卫星的指令信号的系统

An error correction method in which the receiving station detects errors and sends a request for retransmission

接收站检测到错误并发送重传请求的纠错方法_ _

✓ 正确答案

A method of compressing data using autonomous reiterative Q codes prior to final encoding

一种在最终编码之前使用自主重复 Q 码压缩数据的方法

#T8D12🔗

Which of the following best describes an amateur radio mesh network?

以下哪项最能描述业余无线电网状网络？

An amateur-radio data network using commercial Wi-Fi equipment with modified firmware

使用经过修改的固件的商用 Wi-Fi 设备的业余无线电数据网络

✓ 正确答案

A wide-bandwidth digital voice mode employing DMR protocols

采用DMR协议的宽带数字语音模式

An amateur-radio satellite communications network using modified commercial satellite TV hardware

使用改良的商业卫星电视硬件的业余无线电卫星通信网络

An internet linking protocol allowing communication through repeaters around the world

一种互联网链接协议，允许通过世界各地的中继器进行通信

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FCC T8D - 调制模式与通信方式

小节 T8D：调制模式与通信方式