From def23e5eb3d4386aa9af43d752e44f13076ebaae Mon Sep 17 00:00:00 2001
From: Craig Warren <craig_warren@me.com>
Date: Mon, 4 Apr 2016 18:02:29 +0100
Subject: [PATCH] Default frequency for a waveform set to None.

---
 gprMax/waveforms.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gprMax/waveforms.py b/gprMax/waveforms.py
index 440a2a3f..b47016bf 100644
--- a/gprMax/waveforms.py
+++ b/gprMax/waveforms.py
@@ -30,7 +30,7 @@ class Waveform:
         self.ID = None
         self.type = None
         self.amp = 1
-        self.freq = 0
+        self.freq = None
         self.uservalues = None
 
     def calculate_value(self, time, dt):