FCC T4A - 业余无线电实践与电台操作

#T4A01🔗

Which of the following is an appropriate power supply rating for a typical 50-watt output mobile FM transceiver?

以下哪项是典型的 50 瓦输出移动 FM 收发器的合适电源额定值？

24.0 volts at 4 amperes

4 安培时为 24.0 伏特

13.8 volts at 4 amperes

4 安培时为 13.8 伏特

24.0 volts at 12 amperes

12 安培时为 24.0 伏特

13.8 volts at 12 amperes

12 安培时为 13.8 伏特

✓ 正确答案

#T4A02🔗

Which of the following should be considered when selecting an accessory SWR meter?

选择附件 SWR 计时应考虑以下哪些因素？

The frequency and power level at which the measurements will be made

进行测量的频率和功率电平

✓ 正确答案

The distance that the meter will be located from the antenna

仪表与天线的距离

The maximum SWR anticipated on the transmission line

传输线上预期的最大 SWR

The ability of the meter to compensate for a poor transmission line match to the antenna

仪表补偿传输线与天线匹配不良的能力

#T4A03🔗

Why are short, heavy-gauge wires used for a transceiver’s DC power connection?

为什么收发器的直流电源连接使用短而粗的电线？

To minimize voltage drop when transmitting

尽量减少传输时的压降

✓ 正确答案

To provide a close match to the power supply output impedance

提供与电源输出阻抗的紧密匹配

To avoid RF interference

避免射频干扰

To minimize radiative losses in the power cable

最大限度地减少电源线的辐射损耗

#T4A04🔗

How are the audio input and output of a transceiver connected in a station configured to operate using FT8?

如何将工作站中连接的收发器的音频输入和输出配置为使用 FT8 进行操作？

To a computer running a terminal program and connected to a terminal node controller unit

到运行终端程序并连接到终端节点控制器单元的计算机

To the audio output and input of a computer running FT8 software

连接至运行 FT8 软件的计算机的音频输出和输入

✓ 正确答案

To an FT8 conversion unit, a keyboard, and a computer monitor

到 FT8 转换单元、键盘和计算机显示器

To a computer connected to the FT8converter.com website

连接到 FT8converter.com 网站的计算机

#T4A05🔗

Where should an RF power meter be installed?

射频功率计应该安装在哪里？

In the feed line, between the transmitter and antenna

在馈线中，在发射器和天线之间

✓ 正确答案

At the power supply output

在电源输出端

In parallel with the push-to-talk line and the antenna

与一键通线路和天线平行

In the power supply cable, as close as possible to the radio

在电源线中，尽可能靠近收音机

#T4A06🔗

What signals are used in a computer-radio interface for digital mode operation?

在数字模式操作的计算机无线电接口中使用什么信号？

Receive and transmit mode, status, and location

接收和发送模式、状态和位置

Antenna and RF power

天线和射频功率

Receive audio , transmit audio , and transmitter keying

接收音频、传输音频和发射器键控

✓ 正确答案

NMEA GPS location and DC power

NMEA GPS 定位和直流电源

#T4A07🔗

Which of the following is one of the connections required between a computer and a transceiver to operate digital modes?

以下哪一项是计算机和收发器之间运行数字模式所需的连接之一？

Computer “line out” to transceiver push-to-talk

计算机“线路输出”到收发器一键通

Computer “line in” to transceiver push-to-talk

计算机“线路输入”到收发器即按即说

Computer “line in” to transceiver speaker connector

计算机“线路输入”到收发器扬声器连接器

✓ 正确答案

Computer “line out” to transceiver speaker connector

计算机“线路输出”到收发器扬声器连接器

#T4A08🔗

Which of the following conductors is preferred for bonding at RF?

以下哪种导体更适合在 RF 下连接？

Copper braid removed from coaxial cable

从同轴电缆上取下的铜编织层

Copper-clad steel wire

铜包钢线

Twisted-pair cable

双绞线

Flat copper strap

扁铜表带

✓ 正确答案

#T4A09🔗

How can you determine the length of time that equipment can be powered from a battery?

如何确定设备可以使用电池供电的时间长度？

Divide the watt-hour rating of the battery by the peak power consumption of the equipment

将电池的瓦时额定值除以设备的峰值功耗

Divide the battery ampere -hour rating by the average current draw of the equipment

将电池安培小时额定值除以设备的平均电流消耗

✓ 正确答案

Multiply the watts per hour consumed by the equipment by the battery power rating

将设备每小时消耗的瓦特数乘以电池额定功率

Multiply the square of the current rating of the battery by the input resistance of the equipment

将电池额定电流的平方乘以设备的输入电阻

#T4A10🔗

What function does a digital mode hotspot perform for nearby transceivers?

数字模式热点对附近的收发器有什么作用？

Communication with a digital voice or data network

通过数字语音或数据网络进行通信

✓ 正确答案

FT8 digital communications via AFSK using a smartphone connected to the internet

使用连接到互联网的智能手机通过 AFSK 进行 FT8 数字通信

RTTY encoding and decoding without a computer

RTTY编解码无需电脑

High-speed digital communications for meteor scatter

流星散射的高速数字通信

#T4A11🔗

Where should the negative power return of a mobile transceiver be connected in a vehicle?

移动收发器的负电源回路应连接在车辆的何处？

At the 12 - volt battery chassis ground

在12 伏电池底盘接地

✓ 正确答案

To the shell of the power connector

至电源连接器外壳

To any metal part of the vehicle

到车辆的任何金属部分

Through the transceiver’s mounting bracket

通过收发器的安装支架

#T4A12🔗

What is an electronic keyer?

什么是电子键控器？

A device for switching antennas from transmit to receive

一种用于将天线从发射切换为接收的装置

A device for voice activated switching from receive to transmit

一种从接收到发送的语音激活切换装置

A device that assists in manual sending of Morse code

一种辅助手动发送摩尔斯电码的设备

✓ 正确答案

An interlock to prevent unauthorized use of a radio

防止未经授权使用无线电的联锁装置

← 上一节: T3C 📑 返回 T4 大纲下一节: T4B →

FCC T4A - 业余无线电实践与电台操作

小节 T4A：业余无线电实践与电台操作