Yebes Technological Development Center
Projects The Center for Technological Developments (CDT) is a branch of the National Geographic Institute of Spain. • VLBI - Astronomy - Geodesy - Space
ARIES
• Single dish - Centimeter - Milimeter
Yebes Technological Development Center • Propagation experiments: Atmosphere Cerro de la Palera s/n 19141 - Yebes Guadalajara Spain Phone: (+34) 949290311 Fax: (+34) 949290063
Centro de Desarrollos Tecnológicos de Yebes Instituto Geográfico Nacional (Spain)
Phone: (+34) 949290311 Fax: (+34) 949290063 Email: jm.serna@oan.es
Servosystem
Time and Frequency System
ARIES SUBSYSTEMS ▫ Main drives
▫ iMaser 3000 (T4 Science) - Smart Active Hydrogen Maser Clock.
▫ Subreflector.
Specification
Value
▫ Nasmyth mirrors.
Allan deviation (BW=1Hz)
▫ Focal mirrors (AMS).
Phase Noise (5MHz)
▫ Auxiliary (stow, shutter).
Temperature sensitivity
1000 sec and floor (2·10-15) -130dBc/Hz @ 1Hz <5·10-15/Hz 10 ps/K
Phase sensitivity
▫ Four motors per axis, two positions subreflector + focus, moving nasmyth mirrors, AMS five displacements. ▫ Movement range: Az (-90, +430deg), El (0, +90deg).
5, 10 and 100MHz; 1pps
Outputs
Holography
▫ Maximum speed: Az (3deg/sec), El (1deg/sec). Minimum speed: 0.1mdeg/sec.
Optics of the 40m Radio Telescope
Satélite
R
▫ Nasmyth-Cassegrain.
T
Main diameter: 40 meters. Secondary diameter: 3.28 m.
Receivers
F/D=0.375, Fe/D=7.9 (Mag=21.09)
Receivers Cabin
▫ Mounting: Az/El, turning head over bearing.
▫ Size: 8x9x3.5 m3
▫ Operation: Primary and Nasmyth.
▫ Multiple receivers.
▫ Aperture efficiency (150µ µm rms): 70% @ 7mm, 50% @ 3mm. ▫ Pointing: requirement (5’’ @ 10m/sec), 1’’ servosystem error.
Radio Telescope Structure
▫ Automatization. ▫ Receivers (S, CH, C, X, 22Ghz, Q, 3mm). ▫ Nasmyth mirrors (M3 moving in elevation, turn 180deg; M4 & M4’ two fixed positions: 0deg horizontal and 20deg tilted).
Freq band
BW (MHz)
Pol
Trx (K)
TSYS(K)
S
2.2-2.37
170
RH/LHCP
<50
170
CH
3.22-3.39
170
RH/LHCP
<50
170
C
4.56-5.06 5.9-6.9
500 500
RH/LHCP RH/LHCP
<10 <10
35 35
X
8.18-8.98
500
RH/LHCP
<10
65
K
21.75-22.85 23.35-24.45
500 500
RH/LHCP RH/LHCP
<20 <20
65 70
84-116
600
lin/circ
<50
150
10.9-12.75
10
RHCP
<75
120
W Primary
Subreflector
▫ Flat mirrors, aluminium film, elliptical shape, 45µm rms accuracy.
Holography
Back-ends and Control Room ▫ Digital Autocorrelator. Secondary
Bandwidth
Counter Weights
Channels
Resolution
1024MHz
512
2MHz
512MHz
1024
0.5MHz
256MHz
2048
125KHz
128MHz
2048
62.5Khz
▫ FFT Spectrometer.
Fork
▫ VLBI back-ends.
Azimut Bearing Panels Control room
X band Rx
Bandwidth
Channels
Resolution
1500MHz
8192
212KHz
750MHz
16384
53KHz
500MHz
16384
35KHz
100MHz
16384
7Khz
FI Module Phase Cal Unit