Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/~tghosh/haat/PAARE_rewording.doc Дата изменения: Fri Aug 1 21:43:58 2008 Дата индексирования: Sun Apr 10 17:29:53 2016 Кодировка: Поисковые слова: http www.astronomy.ru forum index.php topic 4644.0.html

Existing segment from PAARE Proposal

A number of four standard VLBI frequency bands below 10 GHz will in due
course be required to be serviced by the auxiliary antenna. While a
separate VLBI backend and recorder may be required for the auxiliary
antenna, it might be possible to time-share a single system, as is also
envisaged for the maser time/frequency standard
In searching for an economical solution to obtaining an ``auxiliary''
antenna at Arecibo for use in phase-referenced VLBI (and other roles) and
to be operated in partnership with the Humacao Campus of the UPR and NAIC,
we recently learned that NASA/Canberra Deep Space Communication Complex
(CDSCC) had moth-balled their 11.3-m antenna (DSS-33), earlier used as a
HALCA/VSOP earth station, and were looking for somebody who would be
interested in taking over the dish. This indeed looks a potentially
acceptable option for the auxiliary dish, and we have expressed our
interest to NASA and are in the process to bring it to Arecibo.


Perhaps should transmute to something like:--



The four standard VLBI frequency bands below 10 GHz will in due course be
required to be serviced by the auxiliary antenna. We expect the phase
reference antenna to share the Observatory's maser time/frequency standard,
which may also be feasible with the VLBI backend.

The Arecibo Observatory expects/hopes to obtain and erect a 12 m class
phase-reference antenna for use both by UPRPREAA and in support of VLBI
observations made with its 305 m antenna. However, NAIC does not foresee
being able to provide the technical manpower to build and maintain the
complement of receivers needed to properly exploit the potential of this
additional antenna with funding from its Cooperative Agreement with NSF.
Hence support for the construction and maintenance of the initial C-band
receiving system is sought here by UPR-Humacao from this Proposal. UPR-
Humacao will join with NAIC in seeking funding for other receivers foor the
phase reference antenna via future MRI proposals.


Question to Chris:
perhaps the 327 MHz access would never be needed on the 12 m in view of
both the size of the OTM, and the much wider beam width at that frequency
on the 305 m. Which would alter the initial sentence above. It would be
better if we can be clearcut about the VLBI backend here too!