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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