advice on ardusimple?

[Greg Troxel]

I have been thinking about getting an F9P for a while.  (I realize it's
not the magic infinite performance device some make it out to me.)
Besides the built-in RTK, I am interested in dual-frequency carrier
phase for OPUS and NRCAN PPP (including dynamic post-processed PPP for
trail mapping) as well as rtklib use.

It seems there are multiple options for the module on a board with
micro-USB, and then there is the antenna issue.  I am considering one of
the following boards and an antenna.   This antenna is more than the
non-calibrated one, but still vastly less than anything from Trimble.

  https://www.ardusimple.com/product/simplertk2b/
  https://www.ardusimple.com/product/simplertk2b-f9p-v3/

  
https://www.ardusimple.com/product/calibrated-survey-gnss-multiband-antenna-ip67/

There is also sparkfun:

  https://www.sparkfun.com/products/16481

  but they do not seem to have dual-band antennas

Questions:

  any positive experiences with ardusimple, or any reason to avoid (on
  list if you are comfortable, private hints welcome if not)

  any reason to prefer the v3 board if I am intending to connect a RPI3
  to this and not necessarily use high-power xbee?

  what else should I be looking at instead?  (If I want F9P and
  survey-grade antenna)


Thanks,
Greg

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