diff --git a/adi/fmc_4p_vna.py b/adi/fmc_4p_vna.py
index 584c17b7b..066a059c2 100644
--- a/adi/fmc_4p_vna.py
+++ b/adi/fmc_4p_vna.py
@@ -32,16 +32,17 @@
 # THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import numpy as np
+from adi.ad4858 import ad4858
+from adi.ad5686 import ad5686
 from adi.ad9083 import ad9083
+from adi.ad9173 import ad9173
 from adi.adf4371 import adf4371
 from adi.adl5960 import adl5960
 from adi.admv8818 import admv8818
 from adi.adrf5720 import adrf5720
 from adi.gen_mux import genmux
 from adi.one_bit_adc_dac import one_bit_adc_dac
-from adi.ad9173 import ad9173
-from adi.ad5686 import ad5686
-from adi.ad4858 import ad4858
+
 
 class fmc_4p_vna(adrf5720, ad9083, admv8818, genmux, adf4371, adl5960, one_bit_adc_dac):
     """ FMCVNA Scalable 4-port Vector Network Analyzer Board """
@@ -51,15 +52,15 @@ class fmc_4p_vna(adrf5720, ad9083, admv8818, genmux, adf4371, adl5960, one_bit_a
     def __init__(self, uri):
         self.lo = adf4371(uri)
         self.rfin_attenuator = adrf5720(uri, device_name="adrf5720-rfin")
-        self.lo_attenuator = adrf5720(uri, device_name="adrf5720-lo")
+        self.rfin2_attenuator = adrf5720(uri, device_name="adrf5720-rfin2")
         self.bpf = admv8818(uri, device_name="admv8818")
         self.rfin_mux = genmux(uri, device_name="mux-rfin")
         self.lo_mux = genmux(uri, device_name="mux-adf4371")
         self.freq_src_sel_mux = genmux(uri, device_name="mux-freq-src-sel")
-        self.rfin_freq_src_sel_mux = genmux(uri, device_name="mux-rfin-freq-src-sel")
+        self.rfin_low = genmux(uri, device_name="mux-rfin-low")
         self.hsdac = ad9173(uri)
         self.ad4858 = ad4858(uri)
-        self.ad5732 = ad5686(uri)
+        # self.ad5732 = ad5686(uri)
 
         for i in range(1, 5):
             self.frontend[i - 1] = adl5960(uri, device_name=f"adl5960-{i}")
diff --git a/examples/4p_vna.py b/examples/4p_vna.py
index be174b230..9d44abe5d 100644
--- a/examples/4p_vna.py
+++ b/examples/4p_vna.py
@@ -92,6 +92,7 @@ def spec_est(x, fs, ref=2 ** 15, plot=False, title=""):
 
     return ampl, freqs
 
+
 def ad4858_plot(x, plot=False, title=""):
 
     if plot:
@@ -109,6 +110,7 @@ def ad4858_plot(x, plot=False, title=""):
 
     return r_avg
 
+
 def ad4858_capture():
     channels = []
     x = vna.ad4858.rx()
@@ -132,16 +134,12 @@ def ad4858_capture():
 # Capture all 8 channels
 vna.ad4858.rx_enabled_channels = [0, 1, 2, 3, 4, 5, 6, 7]
 vna.ad4858.rx_buffer_size = 128
-#fs_ad4858 = int(vna.ad4858.rx_sample_rate)
+# fs_ad4858 = int(vna.ad4858.rx_sample_rate)
 
 # ADRF5720
-vna.lo_attenuator.attenuation = 6
+vna.rfin2_attenuator.attenuation = 6
 vna.rfin_attenuator.attenuation = 6
 
-# AD5732R values between -8192...8191
-
-vna.ad5732.channel[0].raw = 0
-vna.ad5732.channel[1].raw = 0
 
 vna.lo_mux.select = "rf8"
 vna.rfin_mux.select = "d1"
@@ -149,7 +147,7 @@ def ad4858_capture():
 vna.lo.rfaux8_vco_output_enable = False
 
 vna.freq_src_sel_mux.select = "rf_dac0_direct"
-vna.rfin_freq_src_sel_mux.select = "rf_dac1_direct"
+vna.rfin_low.select = "d1"
 
 # vna.hsdac.modulation_switch_mode
 #      0 = Mode 0
@@ -167,6 +165,7 @@ def ad4858_capture():
 vna.hsdac.main0_nco_frequency = 100000000
 vna.hsdac.main1_nco_frequency = 100000000
 
+
 # push shifted DC the out of spectrum
 if_frequency = fs
 
@@ -211,10 +210,9 @@ def ad4858_capture():
     #     vna.lo.rfaux8_vco_output_enable = True
     #     vna.lo.rf16_frequency = f
 
-
     vna.bpf.band_pass_center_frequency = int(f / 1e6)
     vna.hsdac.main0_nco_frequency = int(f)
-    #vna.hsdac.main1_nco_frequency = int(f)
+    # vna.hsdac.main1_nco_frequency = int(f)
 
     print("ADL5960-", i, "CT2 REG 0x21 =", vna.frontend[0].reg_read(0x21))
     # ADMV8818 should update automatically as long as the LO doubler is not used
@@ -233,10 +231,11 @@ def ad4858_capture():
         "MHz",
     )
 
-    print (ad4858_capture())
+    print(ad4858_capture())
 
     for r in range(2):
         i = int(r / 2) + 1
+        vna.gpio_hi_low_sel = 0
         vna.rfin_mux.select = f"d{i}"
         x = vna.rx()
         if r & 1:
@@ -248,11 +247,12 @@ def ad4858_capture():
 
     for r in range(2):
         i = int(r / 2) + 1
+        vna.gpio_hi_low_sel = 1
         vna.rfin_mux.select = f"d{i}"
         x = vna.ad4858.rx()
         if r & 1:
             dir = "Reflected"
         else:
             dir = "Forward"
-        
-        ad4858_plot(x[r], plot=True, title=f"AD4858 {dir} Port-{i} f={f} Hz")
\ No newline at end of file
+
+        ad4858_plot(x[r], plot=True, title=f"AD4858 {dir} Port-{i} f={f} Hz")