UPGRADES TO SCHOLES LOW-POWER 35 GHZ PULSE BRIDGE

这个子项目是利用资源的许多研究子项目之一。 由NIH/NCRR资助的中心拨款提供。对子项目的主要支持 子项目的首席调查员可能是由其他来源提供的， 包括美国国立卫生研究院的其他来源。为子项目列出的总成本可能 表示该子项目使用的中心基础设施的估计数量， 不是由NCRR赠款提供给次级项目或次级项目工作人员的直接资金。 根据我们应斯科尔斯博士的要求建造零差34 GHz光谱仪的经验，我们提出了未来的升级方案，该方案基于我们专有的电桥设计。这将大大提高基于该电桥的脉冲Endor的性能。现有的版本是他的窄带34 GHz CW Bruker ER 200D光谱仪的广告。此次升级将把它转换成一台独立的仪器。发送器和接收器通道将被修改以获得最佳性能。峰值功率将提高3到4W倍。光谱仪将不再需要可调谐的Endor谐振器，因为升级后的调谐带宽将至少为2 GHz。此外，数字化单元将取代Boxcar平均器，这也是Pulse Endor的一个重大改进。这将启用复杂的频率切换方案，包括伪随机模式。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Based on our experience with the construction of homodyne 34 GHz spectrometer for Dr. Scholes upon his request, we proposed a future upgrade, based on our proprietary bridge design. This will considerably improve performance of pulse ENDOR based on this bridge. The existing version is an ad-on to his narrowband 34 GHz CW Bruker ER 200D spectrometer. The upgrade will convert it into a stand-alone instrument. The transmitter and receiver channels will be modified for the best performance. Peak power will be increased by a factor of 3 to 4W. The spectrometer will no longer require tunable ENDOR resonator, since the tuning bandwidths after upgrade will be at least 2 GHz. Also, digitizer unit will replace the boxcar averager, which is also a significant improvement for pulse ENDOR. This will enable complex frequency switching schemes, including pseudorandom mode.