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FirstGPS Starter Kit User Guide
27
Using the Starter Kit
2
This file does not come with the distribution of the FirstGPS
Monitor application. Rather, it is generated automatically when
the application runs for the first time and the Save BBRAM on
exit option is selected. Usually, it takes about 15 minutes of
tracking GPS signals before the BBRAM file is completely
filled with GPS almanac pages. On consecutive starts, if the
FirstGPS Monitor has been properly stopped (using the
Initialize / Stop menu item), the BBRAM file is saved in the
same directory as the GUI executable. Having this file available
at the next power-up makes the TTFF much faster.
• Save BBRAM on exit – This option enables the generation of the
BBRAM file as described in the previous paragraph.
• Smooth Dialog Resize – This option enables a smooth slide-out
effect when various GUI dialog boxes are displayed.
• Clock – This option enables selection of the LO to 12.504 MHz
or 13.000 MHz. The MPM in the Starter Kit comes with a
12.504 MHz crystal. The FirstGPS library will not run unless
the Clock option is properly set.
• Num Channels – This option enables selection of the number of
channels of the MPM unit. The MPM comes with 12 channels.
• Week Epoch – This option enables selection of the week epoch
number, which is the number of 1024 week periods since
6 January 1980.
2.5.5
Tools Menu
The following sections describe the three Tools menu items.
TTFF Test Setup
Select Tools / TTFF Test Setup to configure and run a time-to-first-fix
(TTFF) test.