diff --git a/nanovna.h b/nanovna.h
index 883b830..404f579 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -47,7 +47,7 @@
 #define __SI4468__
 
 #define DEFAULT_IF  978000000
-#define DEFAULT_SPUR_IF 978000000
+#define DEFAULT_SPUR_IF 979000000
 #define DEFAULT_MAX_FREQ    800000000
 #define HIGH_MIN_FREQ_MHZ   110
 #define HIGH_MAX_FREQ_MHZ   1200
diff --git a/sa_core.c b/sa_core.c
index d33f315..0e0d8a9 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -1501,6 +1501,7 @@ static const int spur_table[] =                                 // Frequencies t
 {
  117716000,
  746083000,
+ 1956000000,
 #if 0
  // 580000,            // 433.8 MHz table
 // 880000,    //?
@@ -1593,7 +1594,7 @@ int avoid_spur(int f)                   // find if this frequency should be avoi
 //  int window = ((int)actual_rbw ) * 1000*2;
 //  if (window < 50000)
 //    window = 50000;
-  if (setting.mode != M_LOW || !setting.auto_IF || actual_rbw_x10 > 3000)
+  if (setting.mode != M_LOW || !setting.auto_IF)
     return(false);
   return binary_search(f);
 }
@@ -1950,7 +1951,7 @@ modulation_again:
             set_freq (ADF4351_LO2, config.frequency_IF2  - local_IF);          // Down from IF2 to fixed second IF in Ultra SA mode
           }
           if (!setting.tracking && S_STATE(setting.below_IF)) { // if in low input mode and below IF
-            if (lf > extra_IF)
+            if (lf > extra_IF + 138000000)
               set_freq (ADF4351_LO, lf - extra_IF); // set LO SI4432 to below IF frequency
             else
               set_freq (ADF4351_LO, extra_IF-lf); // set LO SI4432 to below IF frequency
diff --git a/si4432.c b/si4432.c
index f6f99df..b5ebcf6 100644
--- a/si4432.c
+++ b/si4432.c
@@ -1006,7 +1006,7 @@ void ADF4351_set_frequency(int channel, uint32_t freq, int drive)  // freq / 10H
 {
 //  freq -= 71000;
 
-  uint32_t offs = ((freq / 1000)* 4) / 1000;
+  uint32_t offs = ((freq / 1000)* ( 0) )/ 1000;
 //  uint32_t offs = 0;
   ADF4351_prep_frequency(channel,freq + offs, drive);
 //START_PROFILE;