UPGRADES TO SCHOLES LOW-POWER 35 GHZ PULSE BRIDGE

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目及 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 根据我们应Scholes博士的要求为他建造零差34 GHz频谱仪的经验，我们提出了基于我们专有的电桥设计的未来升级方案。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 200 D光谱仪的附件。升级后将使其成为一个独立的仪器。 将修改发射器和接收器通道以获得最佳性能。峰值功率将增加3到4 W。光谱仪将不再需要可调谐ENDOR谐振器，因为升级后的调谐带宽将至少为2 GHz。此外，数字化单元将取代矩形波串平均器，这也是脉冲ENDOR的一个重大改进。这将实现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. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. 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.