Arecibo presently supports VLBI for up to a
maximum of 4% of its astronomy observing time. A hydrogen maser
frequency standard is available for VLBI, this being
a unit from Symmetricon Inc.,
(Model No. MHM2010.) For information on this unit
The maser also serves as the Observatory master clock.
Arecibo is equipped with a VLBA4 Data-Acquisition Rack and Mark-5A, plus
an RDBE digital backend and Mark-5C, VLBI recording systems. These are
compatible with the HSA, EVN and Global networks, plus operations with the
RadioAstron 10-m diameter orbital VLBI dish. The 305-m telescope is available
for scheduling with any of these. Any proposer wishing to include the
305-m telecope in their VLBI observations should submit a proposal
to the HSA, EVN or Global networks as usual, rather than to Arecibo.
All proposals should contain special justification for inclusion of
Arecibo. (Observations with ``ad-hoc'' arrays will also be considered. In
this case, proposals should be submitted to Arecibo as specified at
http://www.naic.edu/~astro/proposals/proposal.shtml.It is the
proposers' responsibility to ensure that telescope time be granted by
all observing facilities involved.)
From 2004, Arecibo has used a VLBA4 Data-Acquisition Rack, together with a Mark-5A disk-based VLBI recording system. This allows up to a 1 GBit/s data recording rate. The Mark-5A system also allows Arecibo to participate in real-time e-VLBI with EVN. The addition of an RDBE VLBI digital backend, and Mk5C recorders occurred in 2012. This system permits standard data recording rates of 2-GBit/s.
Robert Minchin 2017-10-30