## page was renamed from Upgrade 09/RF System/frequency distribution box <> = RF Distribution box = . The box resides in the LSC rack. It gets the demodulation signals from the [[Electronics/RF_System/frequency_generation_box| frequency generation box]] and splits it into several outputs so that it can be used by the demodulation boards. The box also generates frequency multiples as 3xf1, 3xf2, 2xf1 and 2xf2 demod signals. = Latest Diagram = . The latest pdf file can be found here [[https://nodus.ligo.caltech.edu:30889/svn/trunk/suresh/40m_RF_upgrade/RF_Distribution_Box.pdf|40m svn]] . The latest Omnigraffle file can be found here [[https://nodus.ligo.caltech.edu:30889/svn/trunk/suresh/40m_RF_upgrade/OmniGraffle_files/RF_Distribution_Box.zip|40m svn]] . {{attachment:RFdistributionbox_1027_2011.png}} = Pictures = . This is how the Frequency Distribution Box looks like . {{attachment:RFdist_2011_Oct_27.png}} . Some more pictures are available in [[https://picasaweb.google.com/foteee/ModificationOnRFDistributionBoxOct262011?authuser=0&authkey=Gv1sRgCIO18N6kgfiyKA&feat=directlink|40m Picasa]] ## . <> = References = . [1] Measurement of the output RF levels [[http://nodus.ligo.caltech.edu:8080/40m/4342|40m elog #4342]] . [2] Measurement of the harmonic distortions [[http://nodus.ligo.caltech.edu:8080/40m/4374|40m elog #4374]] . [3] Modification on the box [[http://nodus.ligo.caltech.edu:8080/40m/5744|40m elog #5744]] ------- <
> = Some Thoughts in Early Days = == 40m Upgrade RF Distribution Box == . This box will serve to split the RF signal coming from the [[Upgrade_09/RF_System/RF_Modulation_Generator| RF Modulation Generator]] into the signals to be fed to the demod boards. . It will distribute both 11 and 55 MHz frequencies. It will also provide the 3f demod signals. . The box will contain 2 8-way power splitters, 2 frequency triplers, 2 2-way power splitters. . The box will have to be powered. ## moved from Upgrade 09/RF System/schedule/RF Distribution == Plans == === RF Distribution === . 1. Construction of Frequency Distribution Box a. exactly the same as for the frequency generation box . 1. Demod board filter upgrade: installation of surface mount low pass/high pass filter . 1. LSC rack routing