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

[Walter Brisken]

Hi Michael,

I believe this should work.  vex 1.5 will not be able to describe this 
properly so you would need to carefully craft the .v2d file to capture 
the setup.  vex 2.0 (support starting with 2.8.1) should handle this 
without special entries in .v2d.  To be safe I would suggest getting 
your hands on a sample dataset, make two copies of it, and try 
correlating one against the other to make sure the output makes sense.

-Walter

On 5/16/24 06:50, Michael Dutka via Difx-users 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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