diff --git a/rfg_vna_viewer.py b/rfg_vna_viewer.py
index 7605188..678da8e 100644
--- a/rfg_vna_viewer.py
+++ b/rfg_vna_viewer.py
@@ -218,7 +218,7 @@ def build_gui():
     p_ph.getAxis("right").setPen(pg.mkPen((255, 100, 200)))
     c_ph_dev = pg.PlotCurveItem(pen=pg.mkPen((255, 100, 200), width=1), name="Отклонение")
     vb_dev.addItem(c_ph_dev)
-    vb_dev.setYRange(-1, 1)
+    vb_dev.setYRange(-3, 3)
     vb_dev.enableAutoRange(axis=pg.ViewBox.YAxis, enable=False)
 
     # Keep secondary ViewBox geometry in sync