An AM broadcast station has a peak carrier voltage of 1.5 kV. The modulating signal frequency
is 10 kHz and the carrier frequency is 1500 kHz. The depth of modulation is 35%. Compute the
following:

The upper and lower sideband frequencies.
The peak modulating signal voltage.
The peak upper and lower sideband voltages.
The maximum value of the AM wave.
4.    A spectrum analyser with an input impedance of 50 ohm is used to measure the power spectrum
of an AM signal obtained by modulating a carrier with a sine wave. The carrier power is 1 W,
and the upper and lower side frequencies have a power of 330 mW each. Determine,
the total power of the AM wave.
the peak carrier voltage.
the percentage modulation.
the peak voltage of modulating sine wave.
peak voltage of the upper and lower side bands.
5.    An AM transmitter has a carrier power level of 50 kW. When it is transmitting a test tone (sine
wave), compute the following:
The total transmitted power when the modulation depth is 50%.
The power in each sideband (with a modulation depth of 50%).
The total transmitted power when the depth of modulation is 100%.
The pow4r in each sideband (with a modulation depth of 100%).
6.    An envelope detector is designed such that its RC time constant is equal to the period of the
modulating signal. Assuming that AM broadcast band extends from 540 kHz to 1600 kHz, and
that the highest modulating signal allowed is 10 kHz, determine the value of C given that the
load presented to the preceding stage must be at least 10

一个AM广播站具有1.5千伏的峰值载波电压。调制信号频率是10千赫兹，载波频率1500千赫

兹。 调制深度为百分之35。计算如下问题：
上边带和下边带频率。
调制信号峰值电压。
上、下边带峰值电压。
AM波形最大值。

4用一台具有50欧姆输入阻抗的谱分析仪测量一个AM信号的功率谱，该AM信号通过调制正弦

载波获得。载波功率 1 W,上、下边带分别具有330毫瓦的功率。试确定：
该AM信号的总功率。
峰值载波电压。
调制百分比。
调制正弦波的峰值电压。
上、下边带峰值电压。

5一台AM发射机具有50千瓦的载波功率。当用其发射一正弦音频测试信号，计算如下问题：
当调制深度为百分之50时的总发射功率。
各个边带的功率（调制深度为百分之50）。
当调制深度为百分之100时的总发射功率。
各个边带的功率（调制深度为百分之50）。

6一台包络检波器的RC时间常数设计成与调制信号周期相同。假设AM广播带宽从540千赫兹

到1600千赫兹, 调制信号最高允许频率为10千赫兹。当前到之前的负载至少为10级，确定常数C。