diff --git a/horusgui/__init__.py b/horusgui/__init__.py
index 39774cf..f7e5c1d 100755
--- a/horusgui/__init__.py
+++ b/horusgui/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.16"
+__version__ = "0.3.17"
diff --git a/horusgui/config.py b/horusgui/config.py
index 76163d2..5e4c47a 100644
--- a/horusgui/config.py
+++ b/horusgui/config.py
@@ -76,7 +76,7 @@ def read_config(widgets):
     global qt_settings, default_config
 
     # This is getting a bit ridiculous, need to re-think this approach.
-    OK_VERSIONS = [__version__, '0.3.15', '0.3.14', '0.3.13', '0.3.12', '0.3.11', '0.3.10', '0.3.9', '0.3.8', '0.3.7', '0.3.6', '0.3.5', '0.3.4', '0.3.1', '0.2.1']
+    OK_VERSIONS = [__version__, '0.3.16', '0.3.15', '0.3.14', '0.3.13', '0.3.12', '0.3.11', '0.3.10', '0.3.9', '0.3.8', '0.3.7', '0.3.6', '0.3.5', '0.3.4', '0.3.1', '0.2.1']
     
     # Try and read in the version parameter from QSettings
     if qt_settings.value("version") not in OK_VERSIONS:
diff --git a/horusgui/gui.py b/horusgui/gui.py
index 9a6e397..c1bf392 100644
--- a/horusgui/gui.py
+++ b/horusgui/gui.py
@@ -876,11 +876,20 @@ def handle_status_update(status):
 def get_latest_snr():
     global widgets
 
-    # Assume 2 Hz stats updates, and take the peak of the last 4 seconds.
-    SNR_LEN = 2*4
+    _current_modem = widgets["horusModemSelector"].currentText()
+
+    _snr_update_rate = 2 # Hz
+
+    if "RTTY" in _current_modem:
+        # RTTY needs a much longer lookback period to find the peak SNR
+        # This is because of a very long buffer used in the RTTY demod
+        _snr_lookback = _snr_update_rate * 15
+    else:
+        # For Horus Binary we can use a smaller lookback time
+        _snr_lookback = _snr_update_rate * 4
     
-    if len(widgets["snrPlotSNR"])>SNR_LEN:
-        return np.max(widgets["snrPlotSNR"][-1*SNR_LEN:])
+    if len(widgets["snrPlotSNR"])>_snr_lookback:
+        return np.max(widgets["snrPlotSNR"][-1*_snr_lookback:])
     else:
         return np.max(widgets["snrPlotSNR"])
 
diff --git a/pyproject.toml b/pyproject.toml
index d983224..a08287e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "horusgui"
-version = "0.3.16"
+version = "0.3.17"
 description = ""
 authors = ["Mark Jessop <vk5qi@rfhead.net>"]