FCC T7A - 电台设备与故障排查

#T7A01🔗

Which term describes the ability of a receiver to detect the presence of a signal?

T7_A01_ 哪个术语描述接收器检测信号存在的能力？

RF gain

射频增益

Sensitivity

灵敏度

✓ 正确答案

Selectivity

选择性

Total Harmonic Distortion

总谐波失真

#T7A02🔗

What is a transceiver?

什么是收发器？

A device that combines a receiver and transmitter

一种结合了接收器和发射器的设备

✓ 正确答案

A device for matching feed line impedance to 50 ohms

将馈线阻抗匹配到 50 欧姆的设备

A device for automatically sending and decoding Morse code

一种自动发送和解码莫尔斯电码的装置

A device for converting receiver and transmitter frequencies to another band

一种将接收器和发射器频率转换到另一个频段的设备

#T7A03🔗

Which of the following is used to convert a signal from one frequency to another?

以下哪项用于将信号从一种频率转换为另一种频率？

Phase splitter

分相器

Mixer

混合器

✓ 正确答案

Inverter

逆变器

Amplifier

放大器

#T7A04🔗

Which term describes the ability of a receiver to discriminate between multiple signals?

哪个术语描述了接收器区分多个信号的能力？

Discrimination ratio

辨别率

Sensitivity

灵敏度

Selectivity

选择性

✓ 正确答案

Harmonic distortion

谐波失真

#T7A05🔗

What is the name of a circuit that generates a signal at a specific frequency?

以特定频率产生信号的电路的名称是什么？

Reactance modulator

电抗调制器

Phase modulator

相位调制器

Low-pass filter

低通滤波器

Oscillator

振荡器

✓ 正确答案

#T7A06🔗

What device converts the RF input and output of a transceiver to another band?

什么设备将收发器的 RF 输入和输出转换为另一个频段？

High-pass filter

高通滤波器

Low-pass filter

低通滤波器

Transverter

颠倒

✓ 正确答案

Phase converter

换相器

#T7A07🔗

What is the function of a transceiver’s PTT input?

对讲机的 PTT 输入有什么作用？

Input for a key used to send CW

输入用于发送 CW 的密钥

Switches transceiver from receive to transmit when grounded

接地时将收发器从接收切换到发送

✓ 正确答案

Provides a transmit tuning tone when grounded

接地时提供发射调谐音

Input for a preamplifier tuning tone

前置放大器调谐音输入

#T7A08🔗

Which of the following describes combining speech with an RF carrier signal?

以下哪项描述了语音与 RF 载波信号的组合？

Impedance matching

阻抗匹配

Oscillation

振荡

Modulation

调制

✓ 正确答案

Low-pass filtering

低通滤波

#T7A09🔗

What is the function of the switch which selects either SSB or CW-FM on some VHF power amplifiers?

某些 VHF 功率放大器上选择 SSB 或 CW-FM 的开关有何作用？

Change the mode of the transmitted signal

改变发射信号的模式

Set the amplifier for proper operation in the selected mode

将放大器设置为在所选模式下正常运行

✓ 正确答案

Change the frequency range of the amplifier to operate in the proper segment of the band

更改放大器的频率范围以在频带的适当部分运行

Reduce the received signal noise

降低接收信号噪声

#T7A10🔗

What can be added to the output of a transceiver to increase the transmitted output power?

可以在收发器的输出中添加什么来增加发射输出功率？

A potentiometer

电位器一个

An RF power amplifier

射频功率放大器 _

✓ 正确答案

An impedance multiplier

阻抗倍增器

All these choices are correct

这些选项都是正确的

#T7A11🔗

What is the function of the Variable Frequency Oscillator (VFO) circuit in a transceiver?

收发器中的变频振荡器 (VFO) 电路的作用是什么？

Set the receive and transmit frequency

设置接收和发射频率

✓ 正确答案

Provide automatic frequency control

提供自动变频控制

Inject a variable frequency to allow CW reception

注入可变频率以允许 CW 接收

Generate and demodulate single sideband signals

生成和解调单边带信号

← 上一节: T6D 📑 返回 T7 大纲下一节: T7B →

FCC T7A - 电台设备与故障排查

小节 T7A：电台设备与故障排查