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22 GHz Observations with the Resurfaced Central 17 m of the Parkes Radio Telescope

  • J. L. Caswell (a1), R. A. Batchelor (a1), W. M. Goss (a1), R. F. Haynes (a1), S. H. Knowles (a1), K. J. Wellington (a1), D. E. Yabsley (a1) and M. Balister (a1)...

Extract

At the centre of the Parkes 64—m radio telescope a region of diameter 17 m has recently been resurfaced to improve its efficiency at high frequencies. The first measurements using this section have been made at 22 GHz, in observations of both continuum sources and water tfapour masers. For these observations the receiver front-end used a mixer cooled in liquid nitrogen, followed by a 5 GHz cryogenic parametric amplifier as a second stage. The option of switching against an offset horn was available and the total system noise temperature was ∽ 750 K.

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References

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Caswell, J. L., Batchelor, R. A., Haynes, R. F., and Huchtmeier, W. K., Aust. J. Phys., 21, All (1974).
Cato, B. T., Romnang, B. O., Lewin, P. T., Rydbeck, O. E. H., Yngvesson, K. S., Cardiasnos, A. G., and Shanley, J. F., Res. Rep. No. 123, Research Laboratory of Electronics and Onsala Space Observatory, Chalmers University of Technology, Gothenburg (1975).
Hills, R., Janssen, M. A., Thornton, D. D., and Welch, W. J., Astrophys. J., 175, L59 (1972).
Johnston, K. J., Sloanaker, R. M., and Bologna, J. M., Astrophys. J., 182, 67 (1973).
Johnston, K. J., Robinson, B. J., Caswell, J. L., and Batchelor, R. A., Astrophys. Lett., 10, 93 (1972).
Lada, C. J., Dickinson, D. F., Gottlieb, C. A., and Wright, E. L., Astrophys. J., (in press) (1976).
Turner, B. E., and Rubin, R. H., Astrophys. J., 170, L113 (1971).

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