Appendix A. Specifications; Gateway Specifications; Logger Specifications; Network Specifications - Geokon GeoNet 8900 Series Instruction Manual

APPENDIX A. SPECIFICATIONS

A.1 GATEWAY SPECIFICATIONS
Data Memory 10: 32 MB
Storage Capacity > 1.04 M Arrays
Communication Type USB, RS-232
Communication Speed 115.2 kBits/second
Communication Parameters 8,N,1 (data bits, parity, stop bits)
Scan Interval 10-1440 Minutes
USB Driver FTDI
Cellular Gateway: Battery pack, or 9‑24V DC external
Power Supply
Local Gateway: D cell, alkaline or lithium (2x), or 12V external
Operating Time
Please contact
Operating Temperature −40 °C to +85 °C
Cellular Gateway: 160 × 260 × 91 mm
(L×W×H)
Local Gateway: 120 × 122 × 91 mm

TABLE 10: Gateway Specifications

A.2 LOGGER SPECIFICATIONS
Data Memory 11: 32 MB
Storage Capacity Varies by model
Trueness 0.082 Hz
Frequency Precision ±0.146Hz (99% CI)
Frequency Resolution ±0.002 Hz
External thermistor: ±0.5 °C
Thermistor Accuracy
On-board sensor: ±0.4 °C
External thermistor: ±0.032 °C
Thermistor Resolution
On-board sensor: ±0.1 °C
Scan Interval 10-1440 Minutes
Power Supply D cell, Alkaline or Lithium (2x), or 12V external
Operating Temperature −40 °C to +85 °C
VW Excitation Peak Current 25 mA (max)
VW Frequency Range 400 Hz - 5000 Hz
Sweep/Read Duration/Channel < 500 mS
Battery Life Refer to Section 4.2
120 × 122 × 91 mm (single-channel)
Dimensions (L×W×H) 160 × 260 × 91 mm (four-channel)
180 × 280 × 101 mm (eight-channel)
Gas discharge tube
Vibrating Wire Channel
High-speed surge protector
Lightning Protection
Transient voltage suppression diode
Gas discharge tube
Thermistor Channel Inductor (lower resistance than high‑speed surge protectors)
Transient voltage suppression diode

TABLE 11: Logger Specifications

A.3 NETWORK SPECIFICATIONS
Network
Radio Frequency, ISM Band 902 − 928 MHz
Topology
Radio Technology
Channels
1
Range
Transmit Power
Receiver Sensitivity
Antenna (Half‑Wave Dipole)
1
Line-of-sight, maximum 4 hops

TABLE 12: Network Specifications

MODEL 8900 SERIES GEONET WIRELESS DATA HOSTING SYSTEM | SPECIFICATIONS | 29
GEOKON
8901-NA 8901-BZ
902 − 906, 915 − 928 MHz
Star/Mesh/Cluster Tree (Automatic)
FHSS
12
Up to 60 km (15 km x 4 hops)
1 W
−106 dBm
2.1 dBi
12:
8903-EU
863 − 870 MHz
Up to 22 km (5.5 km x 4 hops)
20 mW
−106 dBm
1.6 dBi