Revert changes

src/sigutils/specttuner.c

@@ -305,6 +305,8 @@ SU_INSTANCER(
   new->index = -1;
 
   if (!full_spectrum) {
+    /* Tentative configuration */
+    new->k = 1. / (2 * PI / actual_bw);
     /*
      * XXX: THERE IS SOMETHING HERE I COULD NOT FULLY UNDERSTAND
      *
@@ -328,6 +330,7 @@ SU_INSTANCER(
     new->width = SU_CEIL(min_size / params->guard);
     new->halfw = new->width >> 1;
   } else {
+    new->k = 1. / (2 * PI / params->bw);
     new->center =
         2 * SU_FLOOR(.5 * (effective_freq + 1 * rbw) / (2 * PI) * window_size);
     new->size = window_size;
@@ -339,7 +342,7 @@ SU_INSTANCER(
 
   /* Adjust configuration to new size */
   new->decimation = window_size / new->size;
-  new->k = 1. / window_size;
+  new->k = 1. / (new->decimation *new->size);
 
   /*
    * High precision mode: initialize local oscillator to compensate
@@ -354,7 +357,7 @@ SU_INSTANCER(
   new->halfsz = new->size >> 1;
   new->offset = new->size >> 2;
 
-  new->gain = 1.f;
+  new->gain = 1.;
 
   SU_TRY_FAIL(new->width > 0);