[Difx-users] Questions on new digital back end for Russian geodetic stations {External} {External}

[Adam Deller]

I don't immediately see anything that would cause a problem. Depending on
how the VDIF threads are recorded (separate files or interlaced into one
file) there might be a setup change needed (two datasteams per telescope,
one per VDIF file, rather than just one datastream as would be the case for
interlaced VDIF).  I don't think point 3) needs any changes, if there are
channels in these stations that are not present at other stations they just
wouldn't be correlated.

Cheers,
Adam

On Thu, 16 May 2024 at 06:51, Michael Dutka via Difx-users <
difx-users at listmgr.nrao.edu> wrote:

> Hi All,
> We received a message about an upgrade to the digital backend for Russian
> geodetic VLBI stations and then describe the frequency setup like this:
>
>
>    1. VDIF output format (instead of Mark5B+)
>    2. Each frequency range has its own VDIF data stream, i.e. for S/X
>    mode will be two VDIF streams (instead of one like Mark5B+)
>    3. The number of DBBCs used in each frequency range must be a multiple
>    of 2, i.e. standard geodetic mode will be 8 USB channels in S and 8 USB or
>    16 channels (8 USB+ 2 LSB + 6 any) in X (instead of 6 USB in S & 8 USB + 2
>    LSB in X)
>
>
> The question is can DiFX handle this setup?  I'm pretty sure the answer is
> yes (for the 3rd item we might need to use dummy channels or some other
> sort of trick).  Does anyone see any glaring issues?
>
>
>
> --
> Dr. Michael S. Dutka
> US Navy (civilian)
> USNO Phone Number- 202-762-0242
> Cell- 301-996-3588
>
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>


-- 
!=============================================================!
Prof. Adam Deller
Centre for Astrophysics & Supercomputing
Swinburne University of Technology
John St, Hawthorn VIC 3122 Australia
phone: +61 3 9214 5307
fax: +61 3 9214 8797
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