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I am back to work on signal strength measurement for the TMCC/Legacy track signal.  There are several different versions of the R2/4LC that might be used for a signal strength meter, and I would like to know what changes were made to the front end of the 455 KHz receiver on these versions.  This might affect their sensitivities and thus be a factor in any readings that various experimenters might obtain.  Does anyone have a schematic for the RxLC?  All I have is an old LCRU schematic.

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