FCC G4D - 业余无线电实践与电台操作

#G4D01🔗

What is the purpose of a speech processor in a transceiver?

收发器中语音处理器的用途是什么？

Increase the apparent loudness of transmitted voice signals

增加传输语音信号的表观响度

✓ 正确答案

Increase transmitter bass response for more natural-sounding SSB signals

提高发射机低音响应以获得更自然的 SSB 信号

Prevent distortion of voice signals

防止语音信号失真

Decrease high-frequency voice output to prevent out-of-band operation

减少高频语音输出以防止带外操作

#G4D02🔗

How does a speech processor affect a single sideband phone signal?

语音处理器如何影响单边带电话信号？

It increases peak power

它增加了峰值功率

It increases average power

它增加了平均功率

✓ 正确答案

It reduces harmonic distortion

减少谐波失真

It reduces intermodulation distortion

减少互调失真

#G4D03🔗

What is the effect of an incorrectly adjusted speech processor?

语音处理器调整不当会产生什么影响？

Distorted speech

言语扭曲

Excess intermodulation products

过多的互调产物

Excessive background noise

背景噪音过多

All these choices are correct

所有这些选项都是正确的

✓ 正确答案

#G4D04🔗

What does an S meter measure?

S 计测量什么？

Carrier suppression

载流子抑制

Impedance

阻抗

Received signal strength

接收信号强度

✓ 正确答案

Transmitter power output

发射机输出功率

#G4D05🔗

How does a signal that reads 20 dB over S9 compare to one that reads S9 on a receiver, assuming a properly calibrated S meter?

假设正确校准的 S 表，在 S9 上读取 20 dB 的信号与在接收器上读取 S9 的信号相比如何？

It is 10 times less powerful

威力低10倍

It is 20 times less powerful

威力低20倍

It is 20 times more powerful

威力是原来的20倍

It is 100 times more powerful

威力强大100倍

✓ 正确答案

#G4D06🔗

How much change in signal strength is typically represented by one S unit?

一个 S 单位通常代表多少信号强度变化？

6 dB

6分贝

✓ 正确答案

12 dB

12分贝

15 dB

15分贝

18 dB

18分贝

#G4D07🔗

How much must the power output of a transmitter be raised to change the S meter reading on a distant receiver from S8 to S9?

发射器的功率输出必须提高多少才能将远处接收器上的 S 表读数从 S8 更改为 S9？

Approximately 1.5 times

约1.5倍

Approximately 2 times

约2次

Approximately 4 times

约4次

✓ 正确答案

Approximately 8 times

约8次

#G4D08🔗

What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?

当显示的载波频率设置为 7.178 MHz 时，3 kHz LSB 信号占据什么频率范围？

7.178 MHz to 7.181 MHz

7.178兆赫至7.181兆赫

7.178 MHz to 7.184 MHz

7.178兆赫至7.184兆赫

7. 175 MHz to 7.178 MHz

7. 175兆赫至7.178兆赫

✓ 正确答案

7.1765 MHz to 7.1795 MHz

7.1765兆赫至7.1795兆赫

#G4D09🔗

What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?

当显示的载波频率设置为 14.347 MHz 时，3 kHz USB 信号占用什么频率范围？

14.347 MHz to 14.647 MHz

14.347兆赫至14.647兆赫

14.347 MHz to 14. 350 MHz

14.347 兆赫至 14. 350 兆赫

✓ 正确答案

14.344 MHz to 14.347 MHz

14.344兆赫至14.347兆赫

14.3455 MHz to 14.3485 MHz

14.3455兆赫至14.3485兆赫

#G4D10🔗

How close to the lower edge of a band’s phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?

使用 3 kHz 宽 LSB 时，显示的载波频率应该距离频段音素段的下边缘有多近？

At least 3 kHz above the edge of the segment

至少高于段边缘 3 kHz

✓ 正确答案

At least 3 kHz below the edge of the segment

至少低于段边缘 3 kHz

At least 1 kHz below the edge of the segment

至少低于段边缘 1 kHz

At least 1 kHz above the edge of the segment

至少高于段边缘 1 kHz

#G4D11🔗

How close to the upper edge of a band’s phone segment should your displayed carrier frequency be when using 3 kHz wide USB?

使用 3 kHz 宽 USB 时，显示的载波频率应距离频段电话段的上边缘多近？

At least 3 kHz above the edge of the band

至少高于频段边缘 3 kHz

At least 3 kHz below the edge of the band

至少低于频带边缘 3 kHz

✓ 正确答案

At least 1 kHz above the edge of the segment

至少高于段边缘 1 kHz

At least 1 kHz below the edge of the segment

至少低于段边缘 1 kHz

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FCC G4D - 业余无线电实践与电台操作

小节 G4D：业余无线电实践与电台操作