Wavecom W40PC, Manual

Page: 95 / 264

WAVECOM Decoders v6.15 W40PC, W41PC, W51PC Advanced Topics
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After starting the "FSK Code Check Indirect" the shift, center frequency and the baud rate are
determined. These values are displayed in the appropriate fields after the measurement has
taken place.
The software then proceeds with creating a list of the modes to check, which is displayed in the
”Modes to check” window.
The incoming bit stream is now tested continuously against the pre-selected modes.
The name of each identified system is displayed in the ”Detected modes” window. An
identified system may be
started immediately by double-clicking the system in the
” Detected modes ” window.
The Hits-Checks will show you how often during checking a mode was successful. If you
see multiple modes on the screen, then this will give you an indication which mode you have
to try.
If a mode is uniquely identified, the software will switch to the identified mode and decoding
is initiated. If two or more different systems are identified an automatic switch to a mode will
not take place.
VHF FSK CODE CHECK DIRECT (W51PC, W40PC)
"FSK Code Check Direct" is started in automatic mode by selecting the Code Check button or
from "
VHF/UHF-Modes/Analysis DIRECT/FSK Code Check ".
The Analysis is started with the input, gain, translation frequency etc. that was used, last time
in a VHF DIRECT mode. This selection is only available in the menu Preferences… the
"When selecting the toolbar "Analysis Buttons" start HF analysis mode" is not enabled. (See
Preferences…
on page 54)
As an additional help "FSK Code Check Direct" also offers an option to start the analysis
manually after user entry of baud rate and the shift. The software will then start the analysis
using the pre-selected parameters.
”FSK Code Check Direct” is a continuous process. If the baudrate and the shift are determined
correctly, there is no need to restart the analysis, even in case of strong disturbances during
signal sampling. In such a case, the detection of a mode needs more time.