diff --git a/src/NanoVNASaver/Hardware/JNCRadio_VNA_3G.py b/src/NanoVNASaver/Hardware/JNCRadio_VNA_3G.py
index ce87ef4..106126c 100644
--- a/src/NanoVNASaver/Hardware/JNCRadio_VNA_3G.py
+++ b/src/NanoVNASaver/Hardware/JNCRadio_VNA_3G.py
@@ -31,8 +31,9 @@ class JNCRadio_VNA_3G(NanoVNA):
     name = "JNCRadio_VNA_3G"
     screenwidth = 800
     screenheight = 480
-    valid_datapoints = (101, 201, 301, 401, 501)
-    sweep_points_max = 501
+    valid_datapoints = (501, 11, 101, 1001)
+    sweep_points_max = 11
+    sweep_points_max = 1001
 
     def __init__(self, iface: Interface):
         super().__init__(iface)
@@ -40,6 +41,7 @@ class JNCRadio_VNA_3G(NanoVNA):
 
     def getScreenshot(self) -> QPixmap:
         logger.debug("Capturing screenshot...")
+        self.serial.timeout=8
         if not self.connected():
             return QPixmap()
         try:
diff --git a/src/NanoVNASaver/Hardware/SV4401A.py b/src/NanoVNASaver/Hardware/SV4401A.py
index a281ce2..ca5f279 100644
--- a/src/NanoVNASaver/Hardware/SV4401A.py
+++ b/src/NanoVNASaver/Hardware/SV4401A.py
@@ -31,9 +31,9 @@ class SV4401A(NanoVNA):
     name = "SV4401A"
     screenwidth = 1024
     screenheight = 600
-    valid_datapoints = (101, 301, 501)
-    sweep_points_max = 101
-    sweep_points_max = 501
+    valid_datapoints = (501, 101, 1001)
+    sweep_points_min = 101
+    sweep_points_max = 1001
 
     def __init__(self, iface: Interface):
         super().__init__(iface)
diff --git a/src/NanoVNASaver/Hardware/SV6301A.py b/src/NanoVNASaver/Hardware/SV6301A.py
index d0bb831..93a1e6b 100644
--- a/src/NanoVNASaver/Hardware/SV6301A.py
+++ b/src/NanoVNASaver/Hardware/SV6301A.py
@@ -31,9 +31,9 @@ class SV6301A(NanoVNA):
     name = "SV6301A"
     screenwidth = 1024
     screenheight = 600
-    valid_datapoints = (101, 301, 501)
-    sweep_points_max = 101
-    sweep_points_max = 501
+    valid_datapoints = (501, 101, 1001)
+    sweep_points_min = 101
+    sweep_points_max = 1001
 
     def __init__(self, iface: Interface):
         super().__init__(iface)
diff --git a/src/NanoVNASaver/Windows/DeviceSettings.py b/src/NanoVNASaver/Windows/DeviceSettings.py
index acffcad..1080d83 100644
--- a/src/NanoVNASaver/Windows/DeviceSettings.py
+++ b/src/NanoVNASaver/Windows/DeviceSettings.py
@@ -152,6 +152,7 @@ class DeviceSettingsWindow(QtWidgets.QWidget):
 
         if "Customizable data points" in features:
             self.datapoints.clear()
+            self.custom_points_Eidt.setValidator(QIntValidator(self.app.vna.sweep_points_min,self.app.vna.sweep_points_max))
             cur_dps = self.app.vna.datapoints
             for d in sorted(self.app.vna.valid_datapoints):
                 self.datapoints.addItem(str(d))