A High Resolution Radio Telescope for Use at 3.5 M

Mills, B. Y.; Little, A. G.; Sheridan, K. V.; Slee, O. B.

doi:10.1109/jrproc.1958.286712

Cited by 61 publications

(23 citation statements)

References 15 publications

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“…Phase switching and phase-sensitive detection is used in both interferometer systems, the phase-reversing switch being inserted in the local oscillator feed to the common east-west converter (85'5 Mc/s-+25'5 Mc/s). This corresponds exactly to the original Cross receivers (Mills et al 1958). …”

Section: (B) the Lteceiversmentioning

confidence: 54%

“…The constructional elements and performance of this array have been described elsewhere (Mills et al 1958). Briefly, it consists of two collinear rows of half-wave dipoles separated by approximately half a wavelength and backed by a horizontal wire-mesh reflector.…”

Section: Description Of the Instrumentmentioning

confidence: 99%

“…The methods of setting up have been described in detail elsewhere (Mills et al 1958) ; briefly, the current distribution is adjusted by feeding power from a crystalcontrolled oscillator into the aerial via its normal output connection, which is situated at the centre of the array. The current in each dipole is sampled in turn by a pick-up loop and fed to a detector.…”

Section: (C) Automatic Gain Controlmentioning

confidence: 99%

“…The original instrument has been described in detail by Mills et al (1958) t briefly, it consists of a cruciform arrangement of two arrays of dipoles, each approximately 1500 ft long by effectively 15 ft wide. It operates at a wavelength of 3·5 m (85·5 Mc/s) and by combining the outputs of the arrays in a switching arrangement, produces a pencil-beam response.…”

Section: Introductionmentioning

confidence: 99%

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An Interferometer for the Measurement of Radio Source Sizes

Goddard¹,

Watkinson²,

Mills³

1960

Aust. J. Phys.

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SummaryModifications have been made to the 85·5 Mc/s cross-type radio telescope at Sydney to permit the measurement of radio source sizes in the range of 10' to l' arc. The basic modification involves the addition of another aerial at a distant site connected by radio link. A new form of automatic gain control ensures very good stability for the system. The modified instrument is described in general terms and calibration techniques are discussed.

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Section: (B) the Lteceiversmentioning

confidence: 54%

Section: Description Of the Instrumentmentioning

confidence: 99%

Section: (C) Automatic Gain Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Interferometer for the Measurement of Radio Source Sizes

Goddard¹,

Watkinson²,

Mills³

1960

Aust. J. Phys.

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“…The radio telescope and its use have been described in detail by Mills et al (1958). In the present case it is operated as a meridian transit instrument, and the aerial beam is automatically switched successively to five declinations separated by approximately 20 min of arc; the beam is held at each declination for a period of 12 sec.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Strong Radio Sources in Centaurus, Fornax, and Puppis

Sheridan¹

1958

Aust. J. Phys.

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SummaryIsophotes of three strong southern radio sources have been prepared from observa· tions at a wavelength of 3·5 m with a 50 min pencil·beam system. The two extragalactic sources Centaurus-A and Fornax-A are found to have extensive coronas very much larger than the size of the associated galaxies. Using optical estimates of distance these two sources are shown to have similar spatial extensions and may be physically similar systems. The third source, Puppis-A, may be the remnants of a galactic supernova of type II.

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Introduction and Historical Review

Thompson

Moran

Swenson

2001

Interferometry and Synthesis in Radio Astronomy

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Introduction and historical review P. W. RossNocard and Mollereau (1 887) were the first to describe the isolation of streptococci from bovine mastitis and these organisms were likely to have been the group-B streptococci (GBS). Many years elapsed, however, before these streptococci featured again in the literature. In 1933, Rebecca Lancefield divided streptococci into groups on the basis of carbohydrate antigens in the cell wall; her classification scheme was based on precipitation reactions of hot-hydrochloric-acid extracts of whole organisms (Lancefield extracts) with antisera raised in rabbits against whole-cell formalinised streptococci. These classical studies clarified the taxonomy of streptococci to a considerable degree because the cultural and biochemical patterns that had been used before 1933 had added little to streptococcal identification.The streptococci that Lancefield described as group B were isolated from bovine and dairy sources. In 1934 she divided GBS into types I, I1 and I11 and in 1938 subdivided type I into Ia and Ib. All the antigens were polysaccharides. Pattison, Matthews and Maxted (1955) added to the serological profile of GBS by describing two protein antigens, R and X. They also stated that GBS from human and bovine sources were not similar and this was corroborated by Butter and de Moor (1967). Wilkinson (1975) discovered a third protein antigen and called it Icp. It is generally referred to as the Ic protein and is usually found in strains with the Ia or Ib polysaccharide. Strains possessing the Ia and Ic antigens are said to belong to type Ic. The Icp antigen may be found in strains with the I1 or the I11 polysaccharide or without a detectable polysaccharide antigen. With serological tests that identify carbohydrate and protein antigens, many combinations of antigens are found-Ia, Ib, Ic, Icp, 11,

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A High Resolution Radio Telescope for Use at 3.5 M

Cited by 61 publications

References 15 publications

An Interferometer for the Measurement of Radio Source Sizes

An Interferometer for the Measurement of Radio Source Sizes

An Investigation of the Strong Radio Sources in Centaurus, Fornax, and Puppis

Introduction and Historical Review

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