minor polishing

diff --git a/vfo.c b/vfo.c
index 8502ca708c77ba51fc477132d0bf9f92f5a1de89..15479b01ea711dc49f320c6dd8c0af67512c9260 100644 (file)
--- a/vfo.c
+++ b/vfo.c
@@ -813,7 +813,6 @@ void vfo_id_step(int id, int steps) {
     } else {
       delta=vfo[id].frequency;
       vfo[id].frequency=ROUND(vfo[id].frequency,steps);
-      g_print("%s: OLD=%lld NEW=%lld\n", __FUNCTION__,delta, vfo[id].frequency);
       delta = vfo[id].frequency - delta;
     }
 

diff --git a/waterfall.c b/waterfall.c
index 00b54acb1ac5a238abab46e45eb802afac6b9cb0..f34c20371508fc705c79848b23174059a7b07dd8 100644 (file)
--- a/waterfall.c
+++ b/waterfall.c
@@ -170,6 +170,16 @@ void waterfall_update(RECEIVER *rx) {
       rx->waterfall_sample_rate=rx->sample_rate;
     }
 
+    //
+    // If we have just shifted the waterfall befause the VFO frequency has changed,
+    // there are  still IQ samples in the input queue corresponding to the "old"
+    // VFO frequency, and this produces artifacts both on the panadaper and on the
+    // waterfall. However, for the panadapter these are overwritten in due course,
+    // while artifacts "stay" on the waterfall. We therefore refrain from updating
+    // the waterfall *now* and continue updating when the VFO frequency has
+    // stabilized. This will not remove the artifacts in any case but is a big
+    // improvement.
+    //
     if (rotate_pixels != 0)  return;
 
     memmove(&pixels[rowstride],pixels,(height-1)*rowstride);