OE3GBB
This is the home of amateur radio station OE3GBB.
I am licensed since 1969 and have enjoyed this hobby since then. My special interests are
antennas and propagation on short-wave.
Please follow this link to my homepage as professional engineer.
Within my company IEP GmbH. we are active in the field of energy management.
You have been visitor since 1.10.1998.
QTH:
A-2620 Wartmannstetten 172, Austria
Locator: JN87AQ
height above sea level: 425 m (1390ft)
A small village with about 400 people about 60 km south of Vienna in the eastern foothills
of the Alps. My QTH is situated on the outskirts of the village where we own about 8 ha
(20 acres) of fields and wood. There is a downslope of about 20 meters (60 ft) from
the towers from about 260 to 360/0 and 150 degrees azimut. Ground condition is heavy clay.
The Alps are rising to the west up to 2000m (6000ft) within 20 km (12.5m) and the horizon
in this direction is at 4°. The same horizon is existing to the north and east because of
closer but lower hills. To the northeast the horizon is about +/- zero because of the
Viennese basin. The only direction making problems is to the south because of a close
mountain range climbing up to 1800m (5900ft) resulting in a horizon of about 8°.
View of our house to NW (short path North America).
Equipment:
| Short-wave: | TS690S Linear amplifier: 1 kW homemade (2 x MRF154 MosFET) Sommer beam XP708 at 16m (48ft) Delta loop for 160/80m with apex 26m (80ft) |
| 144 Mc Band: | TR2299G Linear amplifier: 80 W homemade collinear vertical antenna |
| 432 Mc Band: | FT690 Linear amplifier 120W 9 ele. Yagi |
| Towers: | 16m (48ft) self supporting tower, stainless steel and elevator
for rotator and beam 26m (75ft) self supporting tower, galvanized angle steel, rotateable upper half |
XP708 with elevator
16m tower with XP708
new 26m tower during construction by myself. This is the view to 50 degrees (short path
Japan).
I got this tower from the local electric utility company and disassembled, reconstructed
and reassembled the whole thing. Its weight is over 2 t (4000 lb) of galvanized and
painted angle steel, bolted with a few hundred of screws. I constructed two bearing points
2 m (6 ft) apart in a height of 13m (42 ft) to allow the upper section to rotate inside
the lower one. ....and it is working!
The new tower is now up. I used a crane to get it up in two parts only. The base is
3x3x1,4m of concrete with rebar cage and connected to a hinge to ease the erection of the
very heavy lower part of the tower. This lower part is carrying the two bearing points 2m
apart. The upper part was lifted easily atop and shifted by hand inside the plates. As
soon I was up it started to rain so tightening the screws was quite unpleasant (it was
also up 14m). The upper part had not to be alligned but I have to adjust the bearings us
soon I want to fully turn the towertop, which will be next spring.
On the right photo you can see the two bearing points. The lower one consists of two
plates with 40 stell balls between them to carry the vertical load. The distance of the
balls provided by a pertinax disc with 40 holes. To carry the horizontal wind load the two
steel plates are turnable in two fitted pieces of steel pipe.
The upper bearing just has to carry the windload. It consists of 8 pieces of plastic roles
mounted on the circumference of the turnable part and a10 mm thick plate on the outer
tower to provide a circular support to the roles.
The turning os done by means of a steel rope going from tower base to a cylindrical
section within the tunable tower and back to earth. This cylindrical section is visible on
the right photo close to the lower bearing.
More photos to follow shortly.
Logging: SWISSLOG Propagation Simulation: PROPLAB
ICEPAC
HFxPropagation: DXmon
ActiveBeaconWizard++Antenna Simulation: EZNEC
YT
TA
AO