Astron. Astrophys. Suppl. Ser.
Volume 137, Number 3, June II 1999
|Page(s)||537 - 541|
|Published online||15 June 1999|
A new radio spectral receiving system at mm in Urumqi Astronomical Station
Department of Astronomy, Nanjing University, Nanjing 210093, PR China
2 Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, PR China
3 Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080, PR China
4 Urumqi Astronomical Station, Chinese Academy of Sciences, Urumqi 830011, PR China
Accepted: 24 March 1999
We describe a new radio spectral receiving system installed on the 25 m radio telescope of the Urumqi Astronomical Station in China. The receiver is conventional cryogenically cooled 22 GHz system, with the front end being a low noise HEMT amplifier. An average noise temperature of the receiver is about 50 K. The back end, however, is less conventional; it is a surface acoustic wave chirp transform spectrometer (SAW CZT), used for the first time in radio astronomy. As the prototype spectrometer, this system has a bandwidth of 40 MHz and 39.06 KHz frequency resolution. The observational results of water vapor masers demonstrate the feasibility of the SAW CZT-based spectrometer as astronomical spectral line observations.
Key words: instrumentation: detectors
© European Southern Observatory (ESO), 1999