Hi Barry!
If you use a number of half wavelength coax cables, you will get the same result as if you made the measurement direct in the feedpoint. You can use the smith chart, one "full circle" is the same as one half wavelength. If you start with a measurement without any cable and open input, you will have a "point" on the edge to the left in the chart. If you connect a cable, 1/4 length, you will end ut at the left side and get a "short", extending the cable to the double, you will be back to where you started. If adding a new half wavelength, you get a "new" circle, a litle closer to the center. This is because there will be some loss in the cable. Set the sweep start to 10kHz and adjust the sweep stop to get a bit more than a full circle. Now you can cut the cable until you get one or two or x whole number of circles - each circle represents one half wavelength.
So, keep in mind using a number of half wavelengths of cable to do measurements "remote" OR you could of course make the calibrations at the end of a random length cable. The calibration will "cancel" the cable length...
Karl Jan - LA3FY
