Remote Unit
All Remote Unit circuit boards are mounted in a vibration-and-shock-isolating chassis. The exclusive use of surface-mounted components ensures BOX will always function — even in the roughest environmental circumstances. The circuit board chassis is bolted to its top-cap and securely fixed with the Remote Unit base, which houses a watertight 'O' ring seal, all in a rugged, shock-proof mounted package.
Seismic data from Remote Unit input connectors are routed directly to the Analog to Digital Conversion (ADC) boards, which employ industry standard ADC chip sets for digitizing. Each ADC board provides signal conditioning and digitizing for four seismic channels.
A Central Processor Unit (CPU) board controls data flow and provides in-unit processing capability, such as vibroseis correlation, summing and instrument self-tests.
Remote units receive command signals from and send data to the Central Recording System via synthesized radio and omni-directional antenna. In the command downlink mode — Central Recording System talking to Remote Unit — the software- controlled radio uses Quadrature Phase Shift Keying (QPSK) modulation to provide long-range, robust communication. During real-time operation, the data up-link — Remote Unit talking to Central Recording System — uses 16QAM to maximize channel throughput.