First, we need to set the frequency range we will sweep. Select STIMULUS from the main menu.

Then go into START

And type 13M

Go back to the menu and click STOP. Type 14M

The unit is now set to sweep 13Mhz to 14Mhz.

Once the frequency is changed, a calibration should be run, or the saved calibration should be loaded from memory.

When changing frequency ranges, or cable setups, it is best to calibrate the VNA. This is fairly easy, and requires 3 calibration devices / loads. An Open, a Short, and a 50-ohm load.

First, go to the calibration menu.

Open the main menu, and select CALIBRATE.

Select CALIBRATE, again.

Place the Open device on the port, and then click OPEN.

Once done, it will place a check mark on the button, and advance to the next button.

Place the Short device on the port, then click Short.

Again, wait for the check box.

Place the 50-ohm Load device on the port, then click Load (even if already checked). Again, wait for the check box.

Once Done, Click Back. Now we see our calibrated range.

Let's SAVE the calibration.

Select any slot you like..

Then click APPLY

Now, when you place a real device, you should see a plot!

To calibrate the antenna for 13.56MHz, move the cursor left or right, to get right on frequency.

Once we get to 13.56MHz, we can see how far off from the bottom we are. Adjust the tuning of the antenna to get the cursor to the bottom of the valley (peak resonance / power). In this picture, our SWR is 1.025, which is quite good!

It may be hard to hit dead center…