| Location: |
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| D- 53902 Bad-Muenstereifel-Effelsberg |
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| geographic longitude |
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6◦53’ 01.0” |
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East |
| geographic latitude |
|
50◦31’ 29.4” |
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North |
| height above sea level |
|
319 |
|
m |
| height above sea level (elevation axis) |
|
369 |
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m |
| Constrution period |
|
1967–1971 |
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| Foundation: |
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| Quantity of concrete: |
|
5200 |
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m3 |
| Piles: |
number |
134 |
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lenght |
8–12 |
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m |
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diameter |
1,2 |
|
m |
| Azimut-track |
diameter |
64 |
|
m |
| At the track an arc second is equivalent to |
|
0,155 |
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mm |
| Precision of the track under load |
|
0,3 |
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mm |
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| Steel construction: |
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| Total weight |
|
3200 |
|
t |
| Weight of the tiltable part |
|
ca. 1950 |
|
t |
| Maximum height (tilted!) |
|
109 |
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m |
| Height at elevation axis |
|
50 |
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m |
| Height of the base frame (over ground) |
|
2 |
|
m |
| Height of the box girder |
|
3 |
|
m |
| Height of the elevation platform (over ground) |
|
20,3 |
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m |
| Height of the cabletwist |
|
12 |
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m |
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| Mainreflector: |
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| Paraboloid |
diameter |
100 |
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m |
| Focal lemght |
|
30 |
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m |
| Reflector depth |
|
20,83 |
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m |
| Number of panels |
|
2360 |
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solid over |
1496 |
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| Area |
plain |
9090 |
|
m2 |
| Aperture |
|
7850 |
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m2 |
| Accuracy of an individual panel |
|
0,3–0,5 |
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mm |
| Alignment accuracy of a panel |
|
0,2 |
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mm |
| Size of the pipes |
|
51–419 |
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mm |
| Radius of the elevation gear rig |
|
28 |
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m |
| At the gear rig an arc sec equated to |
|
0,136 |
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mm |
| Mean surface error |
|
0,5 |
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mm |
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| Subreflector (Gregory): |
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| Ellipsodial mirror |
with a diameter of |
6,5 |
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m |
| Distance of the focal points |
|
24,5 |
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m |
| Distance to the main reflector |
|
32,055 |
|
m |
| Diameter of the central opening |
|
1,25 |
|
m |
| Number of panels |
|
96 |
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| Surface error of one panel |
|
~ 10 |
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µm |
| Mean surface error |
|
≤ 60 |
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µm |
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| Receivier cabines: |
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| Primaryfocus |
dimension |
ca. 6x6x6 |
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m3 |
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max. possible reciever |
9 |
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| Secondary focus (Apex) |
heigth |
7,2 |
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m |
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diameter |
6,2 |
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m |
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number of reciever systemes |
9 |
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number of horns |
19 |
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| electrical power supply: |
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| 2 transformaters, 20kV/400V, convective cooling |
|
800 |
|
kVA |
| Emergency diesel generator |
|
400 |
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kVA |
| Emergency-Battery 235 V |
|
288 |
|
Ah |
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| Drive: |
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| max. slewing (Azimuth) |
(0◦= North, 90◦= East) |
30◦–510◦ |
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during observation |
33,5◦–506,5◦ |
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| zero point of the slewing range |
(quiescent point of the cabeltwist) |
270◦ |
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(West) |
| max. tilt (Elevation) |
|
7,5◦–94◦ |
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during observation |
8,1◦–89◦ |
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| Azimuth: |
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| friction drive with 16 driving wheels |
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| 16 DC -shunt motors |
effective power |
each 17,5 |
|
kW |
| max. speed |
|
32 |
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deg/min |
| time for a rotation of 360◦ |
|
approx. 15 |
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min |
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| Elevation: |
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| geardrive with 2 drive units |
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| per 2 DC -shunt motors |
effective power |
each 17,5 |
|
kW |
| max. speed |
|
16 |
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deg/min |
| time for a tilt from 7,5◦–90◦ |
|
approx. 5 |
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min |
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| controlcircuit: |
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| 1. power (digital): |
tension transmission max. 10 % in astronimic use |
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| 2. drive (analog): |
|
3 - 2500 |
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U/min |
| 3. position (computer controlled): |
max. accurateness |
~ 0,1 arcsec |
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effective (pointing) |
1–2 arcsec |
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(~ 0.2 mm) |