Sunday, April 15, 2012

Contest station DR1A

Tower 1

Build: 03.APR.2004 - Beams: 20m-Stack(5/5) - Height: 38m
It's a 24m high wind turbine tower with swing bearing and on top of that a 14m climbable steel mast is mounted resulting in a total height of 38m. With that it's currently the tallest tower.
Since the summer of 2009 the 2nd stack for 20m is mounted here with the 2 times 5 element Cushcraft-beams.

Tower 2

Build: 31.JUL.1999; Beams: 15m-Stack(5/5) - Height: 30m
The tower is a 18m tall construction tower with sides of 1 by 1 meter. The tower is part of a 48 meter tower, that was taken down in 1991.
In the summer of 2009 we put a turning device with a 30m rotating mast to mount the two 5 element Cushcraft beams.

Tower 3

Build: 29.July.2000; Beams: 20m-Stack(5/5) - Height: 32m
The tower is a self supporting tower composed of a 12m RWE Utility tower that we made longer by 6 m. The rotating part is located in the tower base and rotates a 32m long mast that holds the 20m stack. The 20m stack consists of two 5 element Yagi antennas from ON7LR. The first antenna is mounted 19m above ground, the second 31m. The antenna boom is 16m long.

Tower 4

Build: 29.July.2000; Beam: 40m 3-Element-Yagi - Height: 35m
The first 19m of the gyed construction tower (part of a 48m construction tower) was already errected in the year 2000. In the late summer of 2006 the tower was lengthend by 15m to reach its current final height of 35m above ground.
Here at 35m our 3 element 40m Yagi is mounted. The rotating part that sits in the base can bring the antenna in position via a 35m long mast.

Tower 5

Build: 31.July.1999; Beam: 15m-Stack(5/5) - Height: 37m
Until now there we had 30m of construction tower from the west tower that we build up in 1997 at another place.
In the summer of 2009 we finaly rebuild the tower. The top of the tower was taken off and cut at 25m in order to put a 37m tall rotating mast inside for the 15m stack. THe mast supports the two 5 element Yagi's from ON7LR, one at 26m and another at 36m height above ground.

Tower 6

Build: 03.April.2004; Beam: variable - Height: 29m
We took down the tower in February 2004 at a formal armed forces location.
The tower is cone shaped from 3m*3m at the base up to 1.3m*1.3m at the top. On top of that there is a 4m*4m large working platform at 29m above ground.
This tower will be rebuild in the future.

Tower 7

Build: in the future, no date has been set yet.
This tower was taken down at the same location as tower 6.
It has 3 parts of 6m each and will be lengthend to 25-30m.
Until then the tower will most likely spend its days laying on the antenna lawn.

Tower 8

Build: 03.April.2004; Beams: 2 * 10m-Stack(5/5/5/5) - Height: 38m
This tower used to be a tower for mobile communication and was taken down by us in October 2003. It was build up during the 3-tower activity.
It has a height of 30m and at about 16m we installed a flood light so we don't need to walk in the dark accross the antenna lawn

Tower 9

Build: 20.September.2009; 80m Vertical-radiator - Height: 21m
This is our newest tower. A 21m high vertical radiator for the 80m band that if necessary can be made longer for the 160m band.
Furthermore we have layed out a 3.6km radial net around the radiator.

All towers have their own switching cabinet the base, the so called tower-connection-cabinet.
The tubes with coax, supply and control cables fthat come from the tower-connection-room in the basement end here. At the same time all cables that come from the tower end here and can be routed to the specific cable towards the basement.

Hier muss noch
ein aktuelles Bild hin
von einem
Every tower-connection-cabinet is equiped as follows:

  • 2-3 coax cable 7/8" Hardline-coax
  • 1 control cable 16 * 2 * 0,8mm²
  • 1 control cable 12 * 2 * 1,2mm² (every pair individualy shielded)
  • 1 supply cable NYY 5 * 2,5mm² for lighting purposes)
  • 1 supply cable NYY 5 * 6mm² (supply cable for distribution box)
  • distribution box with 1 * 32A CEE, 1 * 16A CEE , 3 * Schuko
  • Motor control / Rotor control
  • 24V permanent voltage, 2 circuits fused seperately
  • 1 light with 60W-bulb (so that you are not in the dark)

For the future we plan to put up tower number 7, as well as to put up second stacked systems for the 10m-20m bands. Now that we have a full size 40m beam we still need a yagi for the 80m band.
For the far future four square antennas for the 80m and 160m bands are planned for which we need the proper space.
In this way we still have years of work ahead of us before we are finally ready.
Apart from these big Antenna monsters that can be seen from far, we also have conventional "wire antennas", that should not be disregarded.
At this moment we only use dipoles for the 80m and 160m band, which we hung up horozontally between the the tops of a few towers.
The possibility is also there to put up horizontal deltaloops for 40m and 80m that are then located also on the antenna lawn between the towers.
Also we have some beverage antennnas for the low bands (40m, 80m and 160m) around the yard available:
  • two Phased Beverages to 280 degrees (abt. 280m long)
  • two Phased Beverages to 300 degrees (abt. 140m long)
  • one Beverage to 100 degrees (abt. 280m long)
  • one Beverage to 45 degrees (abt. 180m long)
  • one Beverage to 225 degrees (abz. 180m long)
Some more interesting stuff:
  • Until now we dug out about 200 cubic meters of dirt which was filled with the same amount of conrete for the tower bases.
  • Also we dug out 150 cubic meters of dirt to place the tubes for the antenna, control and supply cables.
  • Up to now we placed at  least 2300m of tubing between the tower-connection-room and the 10 tower-connection-cabinets
  • We have placed 1470m of DN60-tubes for the hardline coax cable and 720m DN100 tubes for the rest of the cables.
  • In October of 2005 Markus pulled all of the 7/8" hardline coax cables with a total length of 1738m through the tubes. Apart from that 870m of control and 870m of supply cable were pulled and layed down between the tower-connection-cabinets and the tower-connection-room

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