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Update operating-instructions.md
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@amunters
amunters authored Oct 12, 2018
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Expand Up @@ -19,7 +19,7 @@ Depending on the user's choice, additional functionality provided by this softwa

- remove C91 and C92 (prevent attenuation of the VFO signal)
- remove (or 'thombstone') R101 (disable the original analog crystal BFO oscillator)
- install a short shielded cable between the Raduino si5351 CLK0 output and pin 6 of T4 on the BitX40 main board
- install a short shielded cable from the Raduino si5351 CLK0 output to pin 6 of T4 on the BitX40 main board

As the BFO signal is now generated by the si5351, the received audio may initially sound unnatural (pitched too low or too high). Perform the calibration procedures to precisely calibrate the VFO and BFO frequency.

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