[Difx-users] added support for PCal spacings like 700/9 MHz {External}

[Jan Wagner]

Hi all,

the DiFX dev branch now supports fractional Phase Cal spacings, in
particular a new Korean KVN photonic phase cal system has a spacing of
700/9 MHz = 77.777... MHz.

For users the syntax is:

ANTENNA KY
{
  phaseCalInt = 700       # integer MHz
  phaseCalIntDivisor = 9  # denominator for phaseCalInt, optional, the
default is 1
  toneSelection = all
  ...
}

Note: The feature was initially in the associated feature branch (
https://github.com/difx/difx/tree/feature-kvn-fractional-pcal). It has now
been merged into dev via "git flow feature finish kvn-fractional-pcal".
Incidentally that did not create any Pull Request - "git flow" just
automatically merged the changes back into dev. The lack of a Pull Request
was unintentional, though luckily, the auto-merge nevertheless followed the
merge guideline of https://github.com/difx/difx/wiki/contribution.

kind regards,
Jan
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