Owner's Manual

GDX-350 Sensor Transmitter
20 P/N: 5600-9001 Rev 2
Figure 2-5: Outline Drawing (RF Network Version)
2.3. Transmission Range: 4-20mA Signals
The distance 4-20 mA signals can travel is dependent upon several factors including the cable gauge, DC
power supply voltage level and input impedance of the receiving device.
Note: GDX-350 Controllers have 4-20 mA input resistance of 100 ohms.
2.4. Transmission Range: RF Antenna Signals
The distance radio signals can travel is dependent upon several factors including antenna design,
transmitter power and Freespace losses. In order for a wireless link to work, the available system
operating margin (TX power - RX Sensitivity + Antenna gains) must exceed the Freespace loss and all
other losses in the system. For best RF line-of-site, the
combined
Distance Between Antennas
height of both antennas must exceed
the Fresnel zone diameter (see below).
Fresnel Zone Diameter Freespace Loss (dB)
1000 ft (300 m) 16 ft (4.9 m) 81
1 Mile (1.6 km) 32 ft (9.7 m) 96
5 miles (8 km) 68 ft (20.7 m) 110
10 miles (16 km) 95 ft (29 m) 116