LRC-508 USER MANUAL 1
To contact Sercel Europe Nantes, France Sales; Customer Support; Manufacturing & Repair. B.P. 30439, 16 rue de Bel Air 44474 Carquefou Cedex Tel: +33 2 40 30 11 81, Fax: +33 2 40 30 19 48 Hot-Line: Land: +33 2 40 30 58 88 Marine: +33 2 40 30 59 59 Navigation: +33 2 40 30 69 87 E-mail: sales.nantes@sercel.com customersupport.land@sercel.com customersupport.marine@sercel.com customersupport.navigation@sercel.com repair.france@sercel.com streamer.repair@sercel.com www.sercel.
Guidelines for Safe and Efficient Use: Read this information before using your LRC-508. Warnings, Cautions, and Important notices throughout this manual guide you to avoid injury, prevent equipment damage, and determine equipment use when varying components or configurations exist. Notes provide tips or additional information. SERCEL is not responsible for damages or injuries that result from failure to observe the information provided.
SUMMARY : DESCRIPTION: ............................................................................................................................................................................. 5 DESCRIPTION OF RADIO PROTOCOL: .......................................................................................................................................... 7 FREQUENCY HOPPING SPREAD SPECTRUM (FHSS).....................................................................................................
Description: LRC-508 LRC-508 transmits data between CX-508 via 2.4 GHz radio communication link. It includes: GPS for radio synchronization Connection to CX XDP port: Ethernet communications link and 48V power supply Connection to external 7.
IMPORTANT Whenever any connector is unused, put its connector protective cap in place.
Description of radio protocol: The LRC-508 uses a half-duplex transmission protocol with a Frequency Hopping Spread Spectrum (FHSS) method. A mechanism of Listen Before Talk (LBT) is implemented to avoid radio collisions inside the LRC-508 network or with an external radio network. Moreover, two security keys are configured to secure the LRC-508 network. Frequency Hopping Spread Spectrum (FHSS) The FHSS operates on a set of frequencies.
Deployment: The LRC-508 can be connected to a CX-508 or a SCI-508: Connection to CX-508: The +7.4 dBi 2.4GHz antenna delivered in the kit is connected to LRC-508. LRC-508 is mounted on the LRC mounting kit. The LRC-508 is connected to XDP port of CX-508 with the external 2-m cable. Then the CX-508 automatically powers LRC after its connection, to allow QC communication with the recording truck through a neighboring CX-508 located in a connected spread.
NET Access: - Communication between Central Unit and Spread. - DHCP server to deliver to the concentrator IP XDP1: Port for connection to a radio tool AC Power Access: 110-240Veff 1A – 0.5A CAUTION It is highly recommended to disconnect LRC cable from SCI in case of impending lightning, in order to protect personnel and equipment. The grounding wing nut must be connected to the ground.
LEDs Function: one yellow LED dedicated for the XDP port lighted LRC is connected to this port Configuring the LRC-508: The User has to download a Crew Setup and a Radio Setup in the LRC-508.
Radio Setup Parameters: The radio parameters of LRC-508 are: Radio data rates: The following data rates are supported: • • • 1200 bps The packet duration is up to 400 ms. Moreover, the maximum radiated output power is limited to +10 dBm in Europe countries, and +27dBm for USA and Canada. 100 kbps The packet duration is up to 22 ms. Moreover, the maximum radiated output power is limited to +20 dBm in Europe countries, and +27dBm for USA and Canada. 500 kbps The packet duration is up to 8.5 ms.
• CE for Europe: +20 dBm max at 100 kbps and 500 kbps, +10 dBm max at 1200 bps • FCC / IC for USA and Canada: +27dBm max at 1200bps, 100kbps, 500kbps Set Radio frequencies: Use this menu to choose one of these sets of frequencies used in the Frequency Hopping Spread Spectrum (FHSS): • • • • • • • • • 2405-2469 hopset : full 2.4GHz frequency band1 {2405.5 MHz; 2409.5 MHz;….; 2465.5; 2468.5 MHz } is the set of frequencies 2405-2469 hopset : full 2.4GHz frequency band2 {2406.5 MHz; 2410.5 MHz;….; 2466.
Use the Synchro Word key to prevent connection to another LRC-508 network. The radio packets transmitted with a Synchro Word key cannot be received by a LRC-508 configured with another Synchro Word key.
Maintenance: Calibration The 1200-bps mode needs an oscillator of LRC-508 radio with a 1-ppm accuracy or better. To guarantee such accuracy along the lifetime of the product, a calibration of oscillator frequency is necessary one time every year. To do that, deploy LRC-508 in an open-sky environment and at about +25°C +/- 5°C. Launch an oscillator calibration test, internal GPS Pulse-Per-Second is the reference during this test.
LRC-508 connectors: RF connectors: straight bulkhead Jack panel seal 10-C connector: Low Line plug A B Signal Name +5V GND I/O type In In Other signal C Not connected D Not connected E ETH_RX_N In +24Vdc F ETH_RX_P In +24Vdc G ETH_TX_N Out -24Vdc H ETH_TX_P Out -24Vdc I RS232_TX Out J RS232_RX In LRC cable is connected to CX XDP connector with the following pinout: XDP plug B A C Signal Name XDP-MX1+ XDP-MX1XDP-MX2+ I/O type In-Out In-Out In-Out Other signal XDP_P24 +24Vdc X
Specifications: Operating Voltage 48 Vdc Current consumption 10mA (Typical current consumption) Power consumption 0.5W (Typical power consumption) 0.7W (Max power consumption in CE configuration) 0.9W (Max power consumption in FCC configuration) Radio data rates 1.2 – 100 – 500 kbps Radio Frequency Characteristics: Frequency band 2405 – 2469 MHz Spreading method FHSS Number of channels 17 Antenna gain +7.4 dBi typ. Radiated output power CE Mode at 1.
Regulatory Information: USA This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. WARNING This device must be professionally installed.
Manufacturer L-COM NCG Reference HG2408UR-NM SFR-245SPR-R Gain +7.4dBi +7.
