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Dual Band MM-Wave Receiver for Onsala 20 m Antenna

Igor Lapkin (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling) ; Mathias Fredrixon (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling) ; Erik Sundin (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling) ; Leif Helldner (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Lars E. Pettersson (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Sven-Erik Ferm (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling) ; Miroslav Pantaleev (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Victor Belitsky (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling)
Proceedings of the TWENTY-FIFTH INTERNATIONAL SYMPOSIUM ON SPACE TERAHERTZ TECHNOLOGY, April 27-30, 2014, Moscow, Russia p. 132. (2014)
[Konferensbidrag, refereegranskat]

We present the design and the first light results for the new dual band receiver (4 mm and 3 mm bands) for Onsala Observatory 20 m antenna. For single dish operation, the receiver uses innovative on-source/off-source optical switch. Within the same optical layout, the switch, in combination with additional optical components, provides 2 calibration loads and sideband measurements possibilities. The optics layout of the receiver uses offset elliptical cold mirrors for both channels whereas the on-off switch employs flat mirrors only. The 3 mm channel employs 2SB dual polarization receiver with OMT, 4-8 GHz IF, x 2pol x (USB+LSB). The cryostat has 4 optical widows made of HDPE with anti-reflection corrugations, two for the signal and two for each frequency band cold load. The cryostat employs a two stage cryocooler RDK 408D2 and uses anti-vibration suspension of the cold-head to minimize impact of the vibrations on the receiver stability. The LO system is based on Gunn oscillator with PLL and two mechanical tuners for broadband operation, providing independently tunable LO power for each polarization. At the conference, we will present details on the receiver optics, cryostat design and the result of the first on-sky observations.



Denna post skapades 2015-01-19.
CPL Pubid: 211087