Antenna system noise temperature and antenna efficiency are the most important items in the system debugging and checking before the VLBI observation.
在流动vlbi的观测试验中，天线系统噪声温度和天线效率是观测前系统调试和检测的两项重要内容。
The conversion loss and noise temperature of mixers is determined by changing the IF noise temperature so as to change the noise temperature of the receiver system.
混频器的变频损耗和噪声温度的测量可以用改变中频部分的噪声温度使接收机的系统噪声温度变化来加以确定。
After the bandwidth and temperature, the remaining factor in determining the system noise is the effective source resistance.
讨论了带宽和温度以后，决定系统噪声的另一个因素就是等效源电阻。
Refrigeration system for high-quality full-closed compressor, refrigeration capacity, low noise, high-quality box with a fan device, forced air convection, a more uniform temperature distribution.
制冷系统为优质全封闭压缩机，制冷量大、噪音低，箱内配以优质风机装置，强迫空气对流，温度分布更加均匀。
The system provides two major functions including measuring noise temperature of low noise devices and calibrating the Excess noise Ratio (ENR) of solid-state noise sources.
该系统主要完成两大类功能：测试低噪声器件的噪声温度和校准固态噪声源的超噪比。
An integrated system of reducing temperature and noise is designed, which has some functions, such as collecting heat, isolating noise, exhausting heat and eliminating noise.
因此，设计了具有集热、降温和消声功能的的电机降温降噪综合系统。
The central wavelength is discussed based on the combination of signal-to-noise ratio, temperature sensitivity of system and operating stability.
从系统信噪比、温度灵敏度和工作稳定性等几个方面综合考虑系统工作的中心波长。
The principle to obtain low noise laser output is analyzed and a new laser structure and a precise temperature controller are designed to meet the requirement of DVD mastering system.
针对DVD母盘系统对激光的特殊要求，分析了低噪声激光输出的实现原理，设计了合理的激光结构和精确的温度控制系统，以保障低噪声高稳定的蓝色激光输出。
System integrators should design systems that ensure that the air temperature around the boxed processor fan heatsink is kept below the lower set point for the lowest noise level.
系统集成商设计系统时，应该使盒装处理器风扇散热器周围空气温度保持在最低设置点之下时，保证风扇在最低噪音下工作。
The air inlet can be switched on off with facility. Air-circulation system is made of low-noise import motor, suitable wind direction. The temperature in the working chamber is even.
进风口开关自如，热风循环系统由低噪声进口风机和适合风道组成，工作室内温度均匀。
This speciality standard will give a go-ahead for using as the reference of the cold and room-temperature microwave noise standard source below 3dB ultra-low-noise received system.
本标准批准后即作为噪声系数3分贝以下低噪声精密测试时的“冷热源”专业技术标准。
This speciality standard will give a go-ahead for using as the reference of the cold and room-temperature microwave noise standard source below 3dB ultra-low-noise received system.
本标准批准后即作为噪声系数3分贝以下低噪声精密测试时的“冷热源”专业技术标准。
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