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: New bands and observing modes are available on a limited, shared-risk basis:

  • W band (72 - 90 GHz) observations are now available for a limited number of hours in the semester (winter time only), with a bandwidth of 18.5 GHz.
  • On-the-fly mapping in the Q and W bands is now available with a bandwidth of 2.5 GHz.
  • Total power continuum On-the-fly mapping is also available using the FFT spectrometers. Simultaneous observations at up to 8 frequencies in the Q or W bands are possible, with bandwidths up to 2.5 GHz per frequency. To request this mode, select "On the Fly map" in the Observing Goals section of RAYO, and specify your continuum requirements (frequencies and bandwidths) in the "Special Remarks and Scheduling Constrains" box underneath.

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

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: 18.5 GHz. 38 KHz
  • W Band: 18.5 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 18.5 GHz expansion of bands Q and W has been done within project Nanocosmos (ERC-2013-Syg-610256-NANOCOSMOS) during 2019.