Nasmyth-Cassegrain 40-m diameter telescope. Further information about the
Yebes, 50 km north-east of Madrid.
40º 31' 30.75" N, longitude:
03º 05' 19.41" W, elevation:
The 40-m radiotelescope is equipped with HEMT receivers for the 2.2-50 GHz range, and a SIS receiver for the 85-116 GHz range. However for single dish observations only the frequency ranges in the table below can be observed.
Observations at frequencies below 4.8 GHz may have strong radiofrequency interferences
(see e.g. López-Pérez & García Carreño 2017
and for frequencies above 100 GHz are subject to low efficiency. Observations at X band (8 GHz) are at a fixed frequency and hence cannot be corrected for Doppler shifts.
Receivers at different frequencies cannot be used simultaneously except for the 22 and 45 GHz receivers which can be used at the same time.
The backends for spectral line observations consist of Fast Fourier Transform spectrometers (FFTS) with the following characteristics:
Position switching and frequency switching observing modes. In the near future, on-the-fly observations will be available.
Continuum observations, only for pointing and focus. In addition, pointing and focus can be checked using astronomical masers by means of pseudo-continuum observations.
Observations will be performed by Yebes operators using macros/procedure defined and prepared by the observer with the help of the Yebes astronomer on duty.