Date Packet Vmin Vmax Amin Amax Tmin Tmax U-h U-min U-max ContErr LastErr
2017-10-10 17:49UTC 00NFVZF No Data No Data No Data No Data 14 16 5 40 44 No Error -3
2017-10-10 17:53UTC 00MFWZF No Data No Data No Data No Data 12 14 5 44 48 No Error -3
kudos to @Zathras UHF station and @Saliyath for adding the observation
Indeed @KD9KCK your are right. F corresponds to -4 which is COMMS_STATUS_TIMEOUT. This may not an error, cause COMMS_STATUS_TIMEOUT can be triggered for example by a incoming frame false alarm in the RX.