What is meant by the blocking dynamic range of a receiver?
接收器的阻塞动态范围是什么意思？
AThe difference in dB between the noise floor and the level of an incoming signal that will cause 1 dB of gain compression
本底噪声与输入信号电平之间的 dB 差异，将导致 1 dB 增益压缩
BThe minimum difference in dB between the levels of two FM signals that will cause one signal to block the other
导致一个信号阻塞另一个信号的两个 FM 信号电平之间的最小 dB 差异
CThe difference in dB between the noise floor and the third-order intercept point
本底噪声与三阶截取点之间的 dB 差
DThe minimum difference in dB between two signals which produce third-order intermodulation products greater than the noise floor
产生大于本底噪声的三阶互调产物的两个信号之间的最小 dB 差异
Which of the following describes problems caused by poor dynamic range in a receiver?
以下哪一项描述了接收器动态范围较差导致的问题？
ASpurious signals caused by cross modulation and desensitization from strong adjacent signals
由交叉调制和强相邻信号减敏引起的杂散信号
BOscillator instability requiring frequent retuning and loss of ability to recover the opposite sideband
振荡器不稳定，需要频繁重新调谐并且失去恢复相反边带的能力
CPoor weak signal reception caused by insufficient local oscillator injection
本振注入不足导致信号接收不良
DOscillator instability and severe audio distortion of all but the strongest received signals
除最强的接收信号外，所有信号均出现振荡器不稳定和严重的音频失真
What creates intermodulation interference between two repeaters in close proximity?
是什么在两个非常接近的中继器之间产生互调干扰？
AThe output signals cause feedback in the final amplifier of one or both transmitters
输出信号在一个或两个发射器的最终放大器中引起反馈
BThe output signals mix in the final amplifier of one or both transmitters
输出信号在一个或两个发射器的最终放大器中混合
CThe input frequencies are harmonically related
输入频率是谐波相关的
DThe output frequencies are harmonically related
输出频率是谐波相关的
Which of the following is used to reduce or eliminate intermodulation interference in a repeater caused by a nearby transmitter?
以下哪项用于减少或消除由附近发射机引起的中继器中的互调干扰？
AA band-pass filter in the feed line between the transmitter and receiver
发射器和接收器之间馈线中的带通滤波器
BA properly terminated circulator at the output of the repeater ’s transmitter
中继器发射机输出端的正确端接循环器
CUtilizing a Class C final amplifier
使用 C 类末级放大器
DUtilizing a Class D final amplifier
使用 D 类末级放大器
What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?
接收频率附近的强信号导致接收器灵敏度降低的术语是什么？
DCross modulation interference
交叉调制干扰
Which of the following reduces the likelihood of receiver desensitization?
以下哪项降低了接收者脱敏的可能性？
AInsert attenuation before the first RF stage
在第一个 RF 级之前插入衰减
BRaise the receiver’s IF frequency
提高接收机的中频频率
CIncrease the receiver’s front-end gain
增加接收机前端增益
DSwitch from fast AGC to slow AGC
从快速 AGC 切换到慢速 AGC
What causes intermodulation in an electronic circuit?
电子电路中产生互调的原因是什么？
BLack of neutralization
缺乏中和作用
CNonlinear circuits or devices
非线性电路或器件
What is the purpose of the preselector in a communications receiver?
通信接收机中预选器的用途是什么？
ATo store frequencies that are often used
存储经常使用的频率
BTo provide broadband attenuation before the first RF stage to prevent intermodulation
在第一个射频级之前提供宽带衰减以防止互调
CTo increase the rejection of signals outside the band being received
增加对接收频带外信号的抑制
DTo allow selection of the optimum RF amplifier device
允许选择最佳的射频放大器器件
What does a third-order intercept level of 40 dBm mean with respect to receiver performance?
40 dBm 的三阶截取电平对于接收机性能意味着什么？
ASignals less than 40 dBm will not generate audible third-order intermodulation products
小于 40 dBm 的信号不会产生可听见的三阶互调产物
BThe receiver can tolerate signals up to 40 dB above the noise floor without producing third-order intermodulation products
接收器可以承受比本底噪声高出 40 dB 的信号，而不会产生三阶互调产物
CA pair of 40 dBm input signals will theoretically generate a third-order intermodulation product that has the same output amplitude as either of the input signals
理论上，一对 40 dBm 输入信号将生成一个三阶互调产物，其输出幅度与任一输入信号相同
DA pair of 1 mW input signals will produce a third-order intermodulation product that is 40 dB stronger than the input signal
一对 1 mW 输入信号将产生比输入信号强 40 dB 的三阶互调产物
Why are odd-order intermodulation products, created within a receiver, of particular interest compared to other products?
与其他产品相比，为什么接收机内创建的奇阶互调产品特别令人感兴趣？
AOdd-order products of two signals in the band being received are also likely to be within the band
正在接收的频带中的两个信号的奇数阶乘积也可能位于该频带内
BOdd-order products are more likely to overload the IF filters
奇数阶乘积更有可能使 IF 滤波器过载
COdd-order products are an indication of poor image rejection
奇数阶产品表明镜像抑制较差
DOdd-order intermodulation produces three products for every input signal within the band of interest
奇数阶互调为感兴趣频带内的每个输入信号产生三个乘积
What is the link margin in a system with a transmit power level of 10 W (+40 dBm), a system antenna gain of 10 dBi, a cable loss of 3 dB, a path loss of 136 dB, a receiver minimum discernable signal of -103 dBm, and a required signal-to-noise ratio of 6 dB?
发射功率为 10 W (+40 dBm)、系统天线增益为 10 dBi、电缆损耗为 3 dB、路径损耗为 136 dB、接收器最小可辨别信号为 -103 dBm、所需信噪比为 6 dB 的系统中的链路裕度是多少？
What is the received signal level with a transmit power of 10 W (+40 dBm), a transmit antenna gain of 6 dBi, a receive antenna gain of 3 dBi, and a path loss of 100 dB?
发射功率为 10 W（+40 dBm）、发射天线增益为 6 dBi、接收天线增益为 3 dBi、路径损耗为 100 dB 时，接收信号电平是多少？
What power level does a receiver minimum discernible signal of -100 dBm represent?
-100 dBm 的接收器最小可识别信号代表什么功率水平？
