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]
Safety Instructions – please note!
•
Do not exceed the tensile strength of the wire!
The PVC-coated stranded wire of the antenna is made of DIN 46431/40500 graded copper with a breaking
load of 210-280 N/sq.mm. This load is far beyond the irreversible stretching limit damaging the wire. To be
reasonably safe the load should not exceed the values in the following table:
Type of antenna cross section maximal load
400W, 80m-10m
1,5mm²
4….6 'Kilos'
400W, 160m
2,5mm²
8…10 'Kilos'
2000W, 160m-10m
2,5mm²
8...10 'Kilos'
please do not force high mechanical tension on the antenna, a slight sag of the antenna will not
disturb the function and efficency of the antenna, but will avoid the antenna to tear on high winds.
•
If trees are used to support the antenna, provisions must be made to take up the
movement of the trees and avoid breaking of the wire. This can be done by a pulley up in
the tree and a halyard with a weight down as shown in the picture above. Alternatively
you can take up the movement with an elastic (rubber) guy line or a spring. Don’t forget
to install a safety catch in case of a failure of the line or spring!
•
Before mounting the antenna make sure that the stainless steel clamps at the egg
insulators and the balun have been securely tightened!
•
Because of the high voltages at both ends of the antenna touching the wire will
cause electric shocks and burns. Try to keep a distance of 1 - 2 meters between the ends
of the antenna and the supporting structures to avoid deteriorating influences by stray
coupling!
•
Keep adequate safety distances to power lines and masts and do not forget to
provide lightning protection!
General Hints for Wire Antennas:
•
To be able to tune the antenna in its actual site it is helpful if you can easily hoist and lower
the antenna.
•
The effectiveness of the antenna depends as much on its height as on its unobstructed
location.
•
The VSWR is influenced by the way the feed line is led down from the balun. Keep it as
perpendicular to the antenna wire as possible.
•
Antennas running parallel to power lines are prone to receive a substantially higher level of
QRM and may easily cause TVI.
