LDI Intellectual Property.
Not for secondary distribution or replication, in part or entirety.
DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 2 - INSTALLATION, SETTING UP AND FIELD VALIDATION 2-7
Figure 2-1: Schematic Representation of one Delta of the Cross Delta Transmit Antenna.
2:23. TCI (a division of SPX) has made available an antenna according to the LDI design. With the TCI
model 656 implementation of the design, the four elements attached to the top of the tower are also used as
guy wires. The four elements / guy wires must be attached to ground anchors embedded in concrete accord-
ing to the TCI instructions. The TCI Installation Manual has specifications for the concrete base for the tow-
er itself, for concrete ground anchors for the four top elements / guy wires, and for the three concrete ground
anchors for the lower sets of guy wires. If a smaller antenna is absolutely necessary, such as for a temporary
installation, consult LDI regarding alternative antenna solutions.
2:24. The Baluns are attached to the tower at the top. The Termination Resistors are attached at the bottom.
The two coaxial cables which feed the baluns at the top of the tower are attached to the tower every meter or
two. These baluns and termination resistors are supplied with the TCI model 656. In addition, LDI can
supply these components if the Digisonde
®
user constructs their own transmit antenna.
Transmit Antenna Interface Requirements
Mechanical
2:25. The two transmit antenna feeder cables of equal length are connected to the Surge Protector then to the
back of the sounder rear I/O panel by N-to-N connectors.
Electrical
2:26. The sounder supplies RF energy to the transmit antenna. No high voltage electrical power is required
nor supplied by the system.
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