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diff --git a/11.-Appendix.md b/11.-Appendix.md index 1ebd166..7285cba 100644 --- a/11.-Appendix.md +++ b/11.-Appendix.md @@ -1,7 +1,7 @@ ## Using KerberosSDR with KrakenSDR Software #### KerberosSDR BOOTING NOTE -(We note that the following problem may be actually fixed with the latest Pi 4 Firmware, but will leave this here). The Pi 4 hardware has a problem where it will not boot if a powered USB hub drawing current from the Pi 4 is plugged in. Inside the KerberosSDR is a powered USB hub and hence the Pi 4 will not boot if the KerberosSDR is plugged in. So please plug the KerberosSDR in after booting. For the KrakenSDR the hardware implementation forces external power only, so this problem does not occur. +(We note that the following problem may be actually fixed with the latest Pi 4 Firmware, but will leave this information here in case people continue to experience this issue). The Pi 4 hardware has a problem where it will not boot if a powered USB hub drawing current from the Pi 4 is plugged in. Inside the KerberosSDR is a powered USB hub and hence the Pi 4 will not boot if the KerberosSDR is plugged in. So please plug the KerberosSDR in after booting. For the KrakenSDR the hardware implementation forces external power only, so this problem does not occur. We strongly recommend making a small modification by removing a jumper on the KerberosSDR PCB to avoid this Pi 4 issue. This modification force external power only on the KerberosSDR by opening the enclosure, carefully removing the top calibration board, and then removing the `JP2` jumper from the PCB. |