User Manual Part 2

User Guide to Q4000/QPRO
Document Number 1135-4713 Rev G
THIS DOCUMENT CONTAINS CONFIDENTIAL AND PROPRIETARY INFORMATION OF QUAKE GLOBAL CORPORATION. IT MAY BE USED BY
RECIPIENT ONLY FOR THE PURPOSE FOR WHICH IT WAS TRANSMITTED AND WILL BE RETURNED UPON REQUEST OR WHEN NO LONGER NEEDED
BY RECIPIENT. DISCLOSURE TO UNAUTHORIZED THIRD PARTIES OR DUPLICATION WITHOUT THE EXPRESS WRITTEN PERMISSION OF QUAKE
GLOBAL IS PROHIBITED.
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5 Logger messages
Log messages are continuously printed to the Logger port on the modem. The level of detail of
the log messages may be adjusted with the QCFG_debug_level_parameter (0x39). The
default level is set to 4. This parameter may be changed via the Logger port by typing ‘d’ ‘e’ and
a number between 1 and 6. The higher the number, the more detailed the log messages.
5.1 ORBCOMM
The receiver is normally in one of two modes: Acquire or Receive. When in Acquire mode, the
modem is looking for a satellite downlink. When in Receive, the modem is receiving a satellite
downlink. When in Receive mode, there are many different messages that are sent to the
Logger. Most of these messages are unimportant to the user, containing information such as
satellite ephemeris data, downlink packet information, uplink packet information, etc.
Below are two examples of log information displayed when using the ORBCOMM network.
5.1.1 Acquire mode
Aq[26Jun02 22:29:48] chan 265 (WB Search) estDplr -2300 Pwr -115 Ebno 11.1
where:
• Aq: Indicates receiver is in acquire mode searching for a satellite.
• 26Jun02 22:29:48: Greenwich Mean Time (GMT) according to the modem’s internal
RTC (Real-Time Clock).
• chan 265: Satellite downlink channel.
• (WB Search): Indicates a Wide-Band search is being performed.
• estDplr -2300: Estimated Doppler frequency in Hz. This is the relative position of the
satellite to the modem. A positive number means the satellite is moving towards the
modem; a negative number means the satellite is moving away from the modem.
• Pwr -115: Estimated Power level in dBm. When the satellite is in view this is the
satellite’s signal strength; when the satellite is not in view this is the amount of noise on
this frequency.
• Ebno 11.1: Estimated Signal/Noise ratio in dB. The larger this number is, the better the
connection.