move some helpers to util.py

charon_vna/io_.py

@@ -0,0 +1,12 @@
+from pathlib import Path
+
+import skrf as rf
+import xarray as xr
+from util import net2s
+
+
+# scikit-rf has no way to save files aside from touchstone and pickle
+def cal2zarr(cal: rf.calibration.Calibration, outpath: Path):
+    ideals = [net2s(net) for net in cal.ideals]
+    measured = [net2s(net) for net in cal.measured]
+    # s.to_zarr(outpath)