Campbell Scientific UT20 and UT30 Tower-based Weather Stations - Manual (Page 38)

UT20 and UT30 Tower-based Weather Stations
FIGURE 8-9. COM220 modem with surge protector
8.3.3 Cellular Transceivers
Campbell Scientific offers two digital cellular modems — the RavenXTV
CDMA modem and the LS300G 3G GSM Cellular Gateway modem. Refer to
our product brochure for information on choosing the right cellular modem for
your weather station.
Mount the digital cellular modem in the enclosure as shown in FIGURE 8-10
with the following steps:
1. Mount the modem to the enclosure backplate using the hardware provided
in the pn 14394 or pn 30988 mounting kit.
2. Connect the modem to the datalogger’s CS I/O port via the SC105
interface or connect the modem to the datalogger’s RS-232 port via the pn
14392 Null Modem Cable.
3. Mount the cellular Yagi antenna on a grounded mast, positioning it to
point toward the nearest cellular tower, with the radiating elements
oriented vertically. Route the coaxial cable into the enclosure through the
wiring port and connect it to the cellular transceiver’s coaxial connector.
Provide strain relief for the cable on the left side of the enclosure with a
cable tie and tab.
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