#G8B01🔗
Which mixer input is varied or tuned to convert signals of different frequencies to an intermediate frequency (IF)?
改变或调谐哪个混频器输入以将不同频率的信号转换为中频 (IF)？
#G8B02🔗
What is the term for interference from a signal at twice the IF frequency from the desired signal?
中频频率是所需信号两倍的信号产生的干扰是什么术语？
#G8B04🔗
What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?
VHF FM 发射机中产生较低频率信号谐波以达到所需工作频率的级是什么？
#G8B05🔗
Which intermodulation products are closest to the original signal frequencies?
哪些互调产物最接近原始信号频率？
#G8B06🔗
What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?
具有 5 kHz 偏差和 3 kHz 调制频率的 FM 电话传输的总带宽是多少？
#G8B07🔗
What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?
12.21 MHz 电抗调制振荡器在 5 kHz 偏差、146.52 MHz FM 电话发射机中的频率偏差是多少？
#G8B08🔗
Why is it important to know the duty cycle of the mode you are using when transmitting?
为什么了解传输时所使用模式的占空比很重要？
#G8B09🔗
Why is it good to match receiver bandwidth to the bandwidth of the operating mode?
为什么接收器带宽与工作模式带宽相匹配比较好？
#G8B11🔗
What combination of a mixer’s Local Oscillator (LO) and RF input frequencies is found in the output?
混频器的本地振荡器 (LO) 和射频输入频率在输出中的组合是什么？
#G8B12🔗
What process combines two signals in a non-linear circuit to produce unwanted spurious outputs?
什么过程在非线性电路中组合两个信号以产生不需要的杂散输出？
#G8B13🔗
Which of the following is an odd-order intermodulation product of frequencies F1 and F2?
以下哪项是频率 F1 和 F2 的奇数阶互调产物？
