WiMo Antennen und Elektronik GmbH
Am Gäxwald 14, D-76863 Herxheim Tel. (07276) 96680 FAX 9668-11
http://www.wimo.com e-mail: [email protected]
W3DZZ+5 Drahtantenne 10-80m, 1000 Watt
Best. Nr:
11376
4. Electrical circuit and antenna operation diagrams.
5. Design.
Trap design
Trap is made under traditional scheme. It is a parallel circuit which consists of inductance coil on the
plastic mandrel with insulated wire and the cable capacitor with the breakdown voltage of 3 kV.
The circuit is placed in a fiberglass case to protect against rain. The case is not sealed, which allows the
inside elements to breath and drain unwanted water. Nevertheless, it is properly protected against atmospheric
condensation.
Antenna's wire arms are attached to the trap with fly nuts. Each trap passes through our Quality Control
department to check basic parameters: rejection of frequency and reactive impedance at 3.65 MHz and 14.2
MHz etc.
Balun design
Balun is designed to reduce radiation caused by feeder skinned current. This design implements a
current balun. In addition to balancing adjustment it enables transformation of the antenna impedance at 14
MHz band.
6. Antenna assembling.
The installation of the antenna is quite easy. Please
note that longer wire segments are connected to the
balun, and shorter wire segments are extend from the
trap.
In the center of the antenna, two short segments are
connected mechanically with the balun's eyebolt by
stranding using brass wire. Make sure that while
pulling the antenna, mechanical loading lay on the
antenna curtain and this wire strand, but not on the
bends heading to the balun's trailer.
7. Installation rules.
We suggest that while buying this antenna, you have already examined the installation location, place or
area where you would like to install it.
Follow things should be kept in mind –
•
The span between two points of suspension shall be at least 33 meters. The height of the suspension
points: at least 10 meters from base/ground.
•
The cable from the antenna's center must be perpendicular to the curtain for at least 10 meters. In case
the perpendicular length cannot be achieved, not a problem, the Antenna would still work, however one
may observe slight parameter change on 20 m band.
•
Antenna can be installed or positioned either horizontally or at an angle to the horizon as a Slopper
antenna wire
isolator
isolator
load
block
trap
trap
capacitive
loads
PL-259
connectors
balance unit/transformer
(balun)
