Sercel 903 User Manual
Exhibit C-Operators Manual
Installation Manual Description of the radio telemetry equipment
Spectru
Description of the radio telemetry equipment
Remote Eagle Module (REM)
The REM connects to the Left or Right Transverse connector of an LAUX, or a
408UL control module or another REM. It interfaces a radio cell with a wireline
telemetry section or with the CM408 or 408XL. It is used to control the digitizer
units (SU6-R) in a radio cell and retrieve the seismic data from it.
12 VDC XDEV Audio RF Power
power supply output
input to antenna
Transverse connectors
12 VDC Multi-REM
power supply output
input
Main specifications
of the REM:
· Operates
from 12
VDC (a
standard 12
V battery).
· Data
reception rate: 400 kbit/s.
· 16 000 sample buffer per channel; acquisition capacity: 32 s@2
1T2S.
m
analyzer
· Transmit/receive frequencies: 216 to 230 MHz in 50-kHz steps;
0311400 8-3
Description of the radio telemetry equipment
l0 W RF output~ power (rain);
One REM in each RF cell (1 retrieve frequency);
Up to six REMs can be used on one antenna;
Maximum number of REMs in a network: 16;
Typical range: 16 to 24 km (10 to 15 miles).
The REM has a built-in signal strength meter used to monitor the RF Spectrum on
the HCI workstation, and an output for connection to an external spectrum analyzer
with a finer resolution. The signal available on the Spectrum Analyzer output is
picked up at the antenna with a 20 dB gain.
Preamplifier
If a preamplifier is used between the antenna and the Antenna connector on a REM,
then the REM Layout Setup on the HCI workstation must let the REM supply a 12
V DC voltage to the preamplifier over the antenna downlead in receive mode.
If any filter is used that does not relay DC voltage, then a DC Block must be used to
supply power to the preamplifier.
8-4 March 2001
Installation Manual Description of the radio telemetry equipment
SU6-R
The SU6-R is a six-channel field digitizer unit used in radio telemetry cells. It uses
a radio link to communicate with a REM. All the SU6-Rs are completely
independent and can coyer any type of field.
In the event of obstruction along an RF radio path to the REM, a simple wire
telemetry link can be used in place of the RF link.
The SU6-R uses a small, light-weight, ragged aluminum package for reliability and
reduced transportation effort.
Its main features are the following:
· A rechargeable nickel-cadmium 0NJ-Cad) battery pack.
· Analog-filter-free and ideal seismic response. Taking advantage of the large
dynamic range and the very low distortion of the SU6-Rs 24-bit-stream A/D
converter, the seismic channels are free from any analog filters. With this design,
idem seismic response with linear phase shift is achieved, as undesirable phase
shifts and temperature drifts otherwise associated with analog components are
eliminated. Also, no filter setting is required at the field level, which precludes any
unrecoverable error that might otherwise arise from incorrect filter settings.
· A low distortion built-in test generator is integrated into every SU6-R, in order to
performance a remote check of the complete acquisition performance, at full
specification, from the central control unit without any external oscillator.
· Internal memory that allows simultaneous collection and retrieval of seismic data.
Shot stacking may also be performed by the SU6-R.
· Each field unit is assigned to a specific frequency upon deployment by the
control unit.
NOTE: The SU6-R is fully compatible with SERCEL-OPSEIS SARs.
0311400 8-5
Installation Manual Description of the radio telemetry equipment
FDPA (Field Deployment aid)
The FDPA is a small hand-held terminal
that allows you to program, monitor and
test certain aspects of the setup for an
SU6-R. Typically the checks are performed
at the time of physical SU6-R deployment
in order to speed up deployment.
The FDPA activates the SU6-Rs power-up
self-test, can evaluate cable leakage and
continuity tests, and assign the SU6-R
address and SU6-R wire-line function.
The FDPA receives its power from the
connected SU6-R. The test results are
displayed on a 4-line, 20-column LCD screen.
Multi-frequency RF Blaster
The RF Blaster Unit, is a
portable, internally batterypowered unit the shooter uses
'to initiate shot point
operations.
The RF Blaster sends and receives
commands, and transmits data to the
central control unit via its own RF
transceiver.
0311400 8-7
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