diff --git a/owrx/form/wsjt.py b/owrx/form/wsjt.py
index 52bd50f..a5e1af0 100644
--- a/owrx/form/wsjt.py
+++ b/owrx/form/wsjt.py
@@ -2,7 +2,6 @@ from owrx.form import Input
 from owrx.form.converter import JsonConverter
 from owrx.wsjt import Q65Mode, Q65Interval
 from owrx.modes import Modes, WsjtMode
-import json
 import html
 
 
diff --git a/owrx/waterfall.py b/owrx/waterfall.py
new file mode 100644
index 0000000..e69de29