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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

IGN Yebes 40m Radio Telescope  

General description of the 40-m radio telescope of IGN in Yebes (Spain).