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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 2 - INSTALLATION, SETTING UP AND FIELD VALIDATION 2-11
2:36. Connect the four receive antenna cables to the Surge Protector then to the respective ANT1, ANT2,
ANT3 and ANT4 connectors on the rear I/O panel. When installing the receive antenna array and running
the cables, verification must be made to confirm that the markings at the sounder end of the cable corre-
sponds to the respective receive antenna location as shown in Figure 2-3.
INSTALLING THE GLOBAL POSITIONING SYSTEM (GPS) RECEIVER
2:37. The sounder derives absolute time from the external GPS receiver that is part of the sounder sub-
system. The GPS receiver is connected through the Surge Protector then over the serial port to the Data
Platform, where it is used by the operating system to maintain synchronism of the Data Platform clock to
UT. The GPS also provides 1 PPS “heartbeat” signal to accurately synchronize Digisonde-4D hardware tim-
ing to the GPS. The Control Platform clock is synchronized with UT by periodic messages from the Data
Platform carrying UT stamp that will be effective at the next 1 PPS event.
2:38. The current model of GPS receiver is a Trimble Navigation receiver which is a single self-contained
unit, weighing less then 500 g. A 30 m interface cable fitted with a lightning surge suppresser is supplied
with the receiver. The receiver is also shipped with a threaded section of pipe and mounting flange.
2:39. Mount the receiver in an area open to the sky, typically on top of the shelter or building, making sure
that it is fixed in a vertical position, and with a relatively unobstructed line of sight to the horizon. Connect
the receiver to the sounder using the interface cable, with the 12-pin Conxall connector connected to the re-
ceiver and the 9-pin sub-D connector connected to the GPS port on the back of the rear I/O panel (see Fig-
ure 1-7).
CONNECTING COMPUTER PERIPHERALS
2:40. The Data computer monitor is connected independently to the electrical power supplied to the site. Re-
fer to the equipment manufacturer’s instructions to ensure that proper safety procedures are carried out.
2:41. The user should connect the monitor to a video output connector (VGA) and a keyboard and mouse to
the available USB ports as shown in the diagram.
CONNECTING TO THE WIDE AREA NETWORK (WAN)
2:42. The sounder uses standard Ethernet RJ45 cable for connections to the WAN.
ELECTRICAL POWER CONNECTION
2:43. A standard 3-pin EIA connector is fitted on the rear panel for connection of the sounder to the AC
mains power source. An appropriate EIA power cable is needed for connection to the AC mains power out-
let. Input power in the range of voltages 110-240 VAC and 50/60 Hz is supported.
Backup power source
2:44. Generally most DPS4D installations make use of commercially available UPS (Uninterruptable Power
Supply) backup power sources. Lowell Digisonde International (LDI) can supply assistance selecting an
appropriate UPS if necessary. Earlier models of the DPS4D had provisions for connecting two external 12
volt automobile storage batteries as an alternative to a UPS. LDI can provide assistance to users who have
this feature and wish to make use of it. Realistically, considering the availability of commercial UPSes, such
UPSes should be the preferred approach and commercial UPSes have software which can be installed in the
Data computer to effect an orderly shutdown when the UPS shuts off the power.
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