A Spanish Scientific and Technical Infrastructure

40m RT basic technical information

Observing modes

Spectral observations. These observations are available under several standard modes: position switch and frequency switch. On-The-Fly (OTF) mode will be offered soon (see below). Position Switch observations can be programmed ad-hoc using several phases. The spectral backends are Fast Fourier Spectrometers (FFTs) with 100 MHz, 500 MHz, 1.5 GHz and 2.5 GHz bandwidths with 6 KHz, 30 KHz, 180 KHz and 38 KHz resolution respectively

Continuum observations. These observations are restricted to total power pointing drifts or focus drifts. Position switch using a wobbler or a beam switch are not available. Currently there are several backends offering a bandwidth of 2.5 GHz, 1.5 GHz, 500 MHz or 100 MHz depending on the observed frequency.

New: On-The-Fly mapping and 3 mm (band W) observations are now offered in DDT proposals under a strict shared-risk policy. Please indicate the desired mode in your scientific justification and in the Scheduling Constraints boxes of the science goals in RAYO, as OTF and band W selections are not yet available in RAYO.

Available observing frequencies:

  • C band: 4.9-5,4 GHz & 6.1 – 6.6 GHz (currently offered in single-dish mode only in the range 6.1 – 6.6 GHz)
  • X Band: 8.1 - 8.9 GHz (currently VLBI only)
  • K Band: 21 - 25 GHz
  • Q Band: 31.3 - 50.6 GHz
  • W Band: 72 - 90 GHz (currently VLBI only)

Instantaneous detection band and spectral resolution

  • C Band: 500 MHz. 6.1 & 30 KHz
  • X Band: 500 MHz. 6.1 & 30 KHz
  • K Band: 500 MHz. 6.1 & 30 KHz
  • Q Band: 18 GHz. 38 KHz
  • W Band: 18 GHz. 38 KHz

Angular resolution (θb) and aperture efficiency(ηA)

  • C Band: θb=260’’, ηA=0.46
  • X Band: θb=180’’, ηA=0.70
  • K Band: θb=80’’, ηA=0.50
  • Q Band: θb=40’’, ηA=0.41
  • W Band: θb=20’’, ηA=0.18

The 18 GHz expansion of bands Q and W has been done within project Nanocosmos (ERC-2013-Syg-610256-NANOCOSMOS) during 2019.