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Jan van Muijlwijk (PA3FXB)
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Jan van Muijlwijk (PA3FXB)2018-01-10 16:27:392018-09-20 20:28:11Dwingeloo observes the BEESAT-3
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Tammo Jan Dijkema
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Tammo Jan Dijkema2017-09-01 09:26:412018-09-21 11:59:12Stellarium background from the radio telescope
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Jan van Muijlwijk (PA3FXB)
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Jan van Muijlwijk (PA3FXB)2017-07-04 18:29:012018-09-24 11:16:23Two satellites reactivated
Dwingeloo has fringes (again) !
/in About CAMRAS, About the radio telescope, Astronomy, User info /by Paul Boven (PE1NUT)On Wednesday the 29th of August 2018, the Dwingeloo Radio Telescope took part in a test VLBI observation and we managed to obtain fringes to Westerbork and Jodrell Bank (Mark II Radio Telescope) right away. This is more than 40 years after its first appearance as a VLBI telescope (see Schilizzi e.a., A&A 77, 1979).
The Dwingeloo Telescope, once the largest fully steerable dish in the world, is now operated by the CAMRAS volunteer organisation. They have, with great support from ASTRON, restored and rejuvenated the historical instrument. Its return to VLBI is a huge milestone and a testament to the great work by all these volunteers.
The image shows the fringes in one of the 8 subbands of each 16 MHz that were recorded. The background image depicts the ‘flowchart’ created in the open source GnuRadio program to convert the input from raw samples, into properly timestamped VDIF data for the JIVE correlator.
Just like the previous time that Dwingeloo did VLBI, the frequency reference is again a borrowed Rubidium clock. However, as part of the ASTERICS project, we are working to transport the H-maser frequency reference signal from Westerbork over fiber to the Dwingeloo Telescope. This still requires a bit of digging to bridge the last few hundred meters to the telescope, but expect even better fringes soon.
Source ASTRON/JIVE Daily Image 31-08-2018
Image CAMRAS/JIVE (Paul Boven)
Restoration film
/in About CAMRAS, About the radio telescope, User info, Visitor info /by Michel Arts (PE1NVK)During the restoration of the Dwingeloo Radio Telescope in the period 2012-2014, Jan Klaassens, Hilko Hof and Arie Burggraaf of amateur videoclub Spotlight in Hoogeveen recorded the entire restoration on film for ASTRON and CAMRAS. In 2016 the restoration film premiered and the film material was published on DVD. Now that this DVD is almost sold out, the film material can also be viewed via the CAMRAS website.
On web page About the radio telescope / Restoration are the trailer (3 minutes) and the documentary (22 minutes). The documentary also includes interviews (in Dutch) with people involved in the restoration.
On page About the radio telescope / Restoration / At a glance is the reportage (32 minutes). The reportage shows almost all steps of the restoration process in more or less chronological order. The interviews have been omitted in the reportage. The different steps of the restoration process can also be seen on this page as separate clips in length ranging from a half minute to a maximum of three minutes. (Audible language at the workplace is Dutch).
The film ‘The construction of a radio telescope’ by Herman Kleibrink from 1957 (29 minutes) (in Dutch) is on page About the radio telescope / Design and build.
All mentioned films can also be viewed via the CAMRAS YouTube channel. A shortened link is https://tinyurl.com/youtube-camras.
Photo CAMRAS (Peter Bennema)