Page | 9 Revision 1.4 15 January 2015
Replay operation in detail
LabSat 3 uses SD card or HDD memory for storage and playback of GNSS data. It is important to note that
Class 10 or higher cards must be used to sustain the transfer speeds required. Racelogic recommend
SanDisk Extreme Class 10 cards for best performance.
The 500GB USB Hard Disk Drive (HDD) supplied contains a selection of pre-recorded scenarios from around
the world. These scenarios can easily be copied to the SD card for replay. The HDD supports either USB2.0
or USB3.0. For optimum data transfer performance using a PC that supports USB3.0 for file transfer from
HDD to SD card is recommended.
The RF OUT connector is a 50Ω output which can be connected directly to the antenna input of the GNSS
receiver being tested. The RF OUT connector of LabSat 3 is DC blocked internally so almost any device can
be connected to this port. When a file is selected for replay, the LabSat will configure constellation
frequencies and digital channels automatically before starting replay. If a triple constellation file is selected
for replay on a single channel LabSat, all three constellations will be displayed before replay allowing the
user to select one.
During replay, pressing
OK
will show a live histogram of satellite levels detected by the internal GNSS
receiver. The internal receiver currently only supports GPS and GLONASS constellations. This has no effect
on the ability of LabSat 3 to record or replay BeiDou signals. When displayed, the UP/DOWN keys switch
between GPS and GLONASS monitor modes. Please note that when switching between GPS and GLONASS
display modes, the internal receiver will take some time to re-acquire satellite signal levels. In the case of
GLONASS signals, it may take over a minute to show the satellite signal information.
LabSat 3 comes with an internal 31dB attenuation capability. To increase the attenuation press the up
arrow, this will increase the attenuation by 1dB. The down arrow will decrease the attenuation level.
Attenuation
Display
Attenuation
Controls