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Section 3. ET Instrumentation Installation
3-10
3.3.2.2 External Installation
The following cellular kit components are used to make the external
connections:
(1) Cellular Antenna
(1) 9 foot Coaxial Antenna Cable
(1) Antenna Mounting Bracket
FIGURE 3.3-3. Cellular Phone Antenna Mounting
1) Mount the antenna to the ET Tower as shown in Figure 3.3-3.
2) Connect the antenna to the external coaxial bulkhead connector with the
9-foot antenna cable.
3.3.3 Short-Haul Modem
Short-haul modems enable communication between a datalogger and computer
over two twisted pairs of wires. The maximum distance between modems is
determined by baud rate and wire gauge. At 9600 baud, the approximate range
is 4.0 miles. DCE / DTE switches on the modems are set to DCE.
CAMPBELL
SCIENTIFIC
LTD
SC932 - S/N E1055
QC
FIGURE 3.3-4. Short-Haul Modem Mounting and Connection