diff --git a/charon_vna/vna.py b/charon_vna/vna.py
index 0a6bcf5..beb0144 100644
--- a/charon_vna/vna.py
+++ b/charon_vna/vna.py
@@ -327,11 +327,11 @@ plt.show()
 cal_frequency = np.linspace(70e6, 600e6, 101)
 ideal_cal_frequency = rf.Frequency(np.min(cal_frequency), np.max(cal_frequency), len(cal_frequency))
 input("Connect SHORT and press ENTER...")
-short = vna_capture(frequency=cal_frequency)
+short = sdr.vna_capture(frequency=cal_frequency)
 input("Connect OPEN and press ENTER...")
-open = vna_capture(frequency=cal_frequency)
+open = sdr.vna_capture(frequency=cal_frequency)
 input("Connect LOAD and press ENTER...")
-load = vna_capture(frequency=cal_frequency)
+load = sdr.vna_capture(frequency=cal_frequency)
 
 short_net = s2net(short)
 open_net = s2net(open)
@@ -345,7 +345,7 @@ calibration = rf.calibration.OnePort(
 
 
 # %%
-s = vna_capture(frequency=cal_frequency)
+s = sdr.vna_capture(frequency=cal_frequency)
 
 # %%
 s_calibrated = calibration.apply_cal(s2net(s))