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@@ -7,6 +7,7 @@ This page supports both SDR and DSP work.  Terry, WB4JFI
 #SDR WORK
 
 ---
+##CHARLESTON SDR RECEIVER #1
 
 ##NEW MASTER OSCILLATOR FIXES PHASE NOISE (JAN.2011)
 I replaced the original program-once 76.8MHz master oscillator with a custom Silicon Laboratories SI570, programmed for 76.8MHz.  The new oscillator dramatically reduced the phase-noise related artifacts when stronger signals hit the Charleston Receiver board.  This SI570 can be ordered directly from SI Labs, at a cost of about $13 each, but I recommend group buys.  The SI Labs part number is: 570CAC000729DG.  In order to have access to the extra I2C program pins (not absolutely required), I placed my SI570 on top of four zero-ohm SMT resistors, that act as spacers between the board and the SI570 itself.