You can connect 2 LabSat 4 units to work together with one unit being the primary.
Click on the heading below to see how to connect, configure and sync LabSat 4 for synchronised recording and replaying.
Connect
- Use the RLACS361 to connect between the EXPANSION ports on the rear panels of LabSat 4.
- Use an SMA to SMA cable to connect between the REF ports on the rear panels of LabSat 4.
Configure Primary Unit
On the LabSat 4 you want to use as the primary unit:
- Access the Menu.
- Navigate to the Constellation menu and press OK.
- Configure the recording settings for the required channels.
- Navigate to Save & Exit and press OK to return to the main menu.
- Navigate to the Setup menu.
- Press OK to enter the CLK REF menu.
- Make sure that OCXO is selected.
- Navigate to the REF OUT setting and make sure it is enabled.
This will output the unit's 10 MHz signal from the OCXO on the REF port.
- Navigate to Back to exit the CLK REF menu and return to the Setup menu.
- Navigate to Primary Ext Sync and press OK to enable it.
This will make the current LabSat unit the primary unit during the synchronised operation.
- Navigate to Exit and press OK to return to the File Selection Screen.
Configure Secondary Unit
On the LabSat 4 you want to use as the secondary unit:
- Access the Menu.
- Navigate to the Constellation menu and press OK.
- Configure the recording settings for the required channels.
- Navigate to Save & Exit and press OK to return to the main menu.
- Navigate to the Setup menu.
- Press OK to enter the CLK REF menu.
- Navigate the External 10MHz and press OK to select it.
This will give the unit the ability to use the 10 MHz signal from the primary unit.
- Navigate to Back to exit the CLK REF menu and return to the Setup menu.
- Navigate to Exit and press OK to return to the File Selection Screen.
When the units are correctly connected and configured, you will see a symbol on the display of the secondary unit.
This symbol will be dark to indicate that the 10 MHz reference signal is received and utilised.
Recording
Antenna
The placement and setup of the GNSS antenna will depend on the use case. However, if you are using a vehicle to record the scenario file, it is important that the antenna is placed in an ideal location on the vehicle.
You can read more about antenna placement on a vehicle here.
- Connect antennas to the RF IN ports on the rear panels of LabSat 4.
Setup
LabSat 4 Record and Replay models have 3 RF channels. This gives you the ability to record 1, 2 or 3 frequency bands.
You can configure the recording of the desired constellations, including frequency, bandwidth and quantization, in the Constellation menu on the front panel display or in the Frequency Setup menu in the LabSat 4 Web Server. You can select up to three of the desired constellation groups.
Record
When you have configured the constellations on your units, make sure you are on the File Selection Screen on LabSat 4 and start the recording:
- Press the REC button on the secondary unit.
This will prime the unit and set it to a "Waiting for sync" state. - Press the REC button on the primary unit to start the synchronised recording.
- Stop the recording by pressing the REC button on the primary unit.
Both units will now return to the File Selection Screen and you will see the synchronised recording highlighted in the list of files.
Replaying
With the LabSat 4 units connected and configured for Multi-Sync as described above, you can connect to a device under test to replay a synchronised scenario:
- Connect a suitable SMA cable from the RF OUT port on the primary LabSat 4 unit to the primary antenna port on the device you are testing.
- Connect a suitable SMA cable from the RF OUT port on the secondary LabSat 4 unit to the secondary antenna port on the device you are testing.
- Select the synchronised file on the File Selection Screen on both LabSat 4 units.
- Press the Play button on the secondary unit.
This will prime the unit and set it to a "Waiting for sync" state.
- Press the Play button on the primary unit to start the synchronised replay.
- Stop the replay by pressing the Play button on the primary unit.
You can use the Expansion Connector to connect LabSat 4 to third-party equipment to pause control or remotely trigger the stop and start of the record or replay.
Click on the heading below to see how to connect and configure LabSat 4 to use it in External Synchronisation with third-party equipment.
The remote trigger functionality is achieved when a low voltage (0 V) is applied. The IO 0 pin is pulled up to approximately 5 V internally, so you can pause the record or replay activity by connecting the IO 0 input to GND via a switch.
