diff --git a/app/rtknavi/naviopt.dfm b/app/rtknavi/naviopt.dfm
index a493c73cb9dd83daa27a00d3c1c3d6f086f894cf..65eaefc3189a80baf73f1a899fe386766da6b61e 100644
--- a/app/rtknavi/naviopt.dfm
+++ b/app/rtknavi/naviopt.dfm
@@ -62,8 +62,6 @@ object OptDialog: TOptDialog
     TabOrder = 4
     object TabSheet1: TTabSheet
       Caption = 'Setting&1'
-      ExplicitLeft = 8
-      ExplicitTop = 22
       object Label3: TLabel
         Left = 24
         Top = 137
@@ -214,14 +212,13 @@ object OptDialog: TOptDialog
         Width = 152
         Height = 21
         Style = csDropDownList
-        ItemIndex = 1
         TabOrder = 1
-        Text = 'L1+L2'
         OnChange = FreqChange
         Items.Strings = (
           'L1'
           'L1+L2'
-          'L1+L2+L5')
+          'L1+L2+L5'
+          'L1+L2+L5+L6')
       end
       object SatEphem: TComboBox
         Left = 248
diff --git a/app/rtkpost/postopt.dfm b/app/rtkpost/postopt.dfm
index 337bd989badbc5f691cd9b1d8efdc7ad1099d843..70806f3eabb8fc929e4501a0f78b72ba7aea316d 100644
--- a/app/rtkpost/postopt.dfm
+++ b/app/rtkpost/postopt.dfm
@@ -105,8 +105,6 @@ object OptDialog: TOptDialog
     TabOrder = 4
     object TabSheet1: TTabSheet
       Caption = 'Setting&1'
-      ExplicitLeft = 1
-      ExplicitTop = 21
       object Label3: TLabel
         Left = 24
         Top = 95
@@ -246,13 +244,15 @@ object OptDialog: TOptDialog
         Width = 152
         Height = 21
         Style = csDropDownList
+        ItemIndex = 1
         TabOrder = 1
+        Text = 'L1+L2'
         OnChange = FreqChange
         Items.Strings = (
           'L1'
           'L1+L2'
-          'L1+L2+E5b'
-          'L1+L2+E5b+L5')
+          'L1+L2+L5'
+          'L1+L2+L5+L6')
       end
       object Solution: TComboBox
         Left = 248
diff --git a/src/options.c b/src/options.c
index 60fc70913da2a54960a8e72ba562233be03f2c4b..1d18d4188e3651924d6fa9659c12e0ddfe054a15 100644
--- a/src/options.c
+++ b/src/options.c
@@ -40,7 +40,7 @@ static char snrmask_[NFREQ][1024];
 /* system options table ------------------------------------------------------*/
 #define SWTOPT  "0:off,1:on"
 #define MODOPT  "0:single,1:dgps,2:kinematic,3:static,4:static-start,5:movingbase,6:fixed,7:ppp-kine,8:ppp-static,9:ppp-fixed"
-#define FRQOPT  "1:l1,2:l1+l2,3:l1+l2+l5,4:l1+l2+l5+l6,2:l1+l2+e5b"
+#define FRQOPT  "1:l1,2:l1+l2,3:l1+l2+l5,4:l1+l2+l5+l6"
 #define TYPOPT  "0:forward,1:backward,2:combined"
 #define IONOPT  "0:off,1:brdc,2:sbas,3:dual-freq,4:est-stec,5:ionex-tec,6:qzs-brdc,7:qzs-lex,8:stec"
 #define TRPOPT  "0:off,1:saas,2:sbas,3:est-ztd,4:est-ztdgrad,5:ztd"