diff --git a/DMRSlot.cpp b/DMRSlot.cpp
index e08db32..001c6f4 100644
--- a/DMRSlot.cpp
+++ b/DMRSlot.cpp
@@ -170,7 +170,8 @@ bool CDMRSlot::writeModem(unsigned char *data, unsigned int len)
 		
 		// Convert the raw RSSI to dBm
 		int rssi = m_rssiMapper->interpolate(raw);
-		LogDebug("DMR Slot %u, raw RSSI: %u, reported RSSI: %d dBm", m_slotNo, raw, rssi);
+		if (rssi != 0)
+			LogDebug("DMR Slot %u, raw RSSI: %u, reported RSSI: %d dBm", m_slotNo, raw, rssi);
 
 		// RSSI is always reported as positive
 		m_rssi = (rssi >= 0) ? rssi : -rssi;
diff --git a/DStarControl.cpp b/DStarControl.cpp
index 1dbf238..6780fb2 100644
--- a/DStarControl.cpp
+++ b/DStarControl.cpp
@@ -1,5 +1,5 @@
 /*
- *	Copyright (C) 2015,2016,2017 Jonathan Naylor, G4KLX
+ *	Copyright (C) 2015,2016,2017,2018 Jonathan Naylor, G4KLX
  *
  *	This program is free software; you can redistribute it and/or modify
  *	it under the terms of the GNU General Public License as published by
@@ -157,7 +157,8 @@ bool CDStarControl::writeModem(unsigned char *data, unsigned int len)
 
 		// Convert the raw RSSI to dBm
 		int rssi = m_rssiMapper->interpolate(raw);
-		LogDebug("D-Star, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
+		if (rssi != 0)
+			LogDebug("D-Star, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
 
 		// RSSI is always reported as positive
 		m_rssi = (rssi >= 0) ? rssi : -rssi;
@@ -179,7 +180,8 @@ bool CDStarControl::writeModem(unsigned char *data, unsigned int len)
 
 		// Convert the raw RSSI to dBm
 		int rssi = m_rssiMapper->interpolate(raw);
-		LogDebug("D-Star, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
+		if (rssi != 0)
+			LogDebug("D-Star, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
 
 		// RSSI is always reported as positive
 		m_rssi = (rssi >= 0) ? rssi : -rssi;
diff --git a/NXDNControl.cpp b/NXDNControl.cpp
index c513f50..65c4955 100644
--- a/NXDNControl.cpp
+++ b/NXDNControl.cpp
@@ -117,7 +117,8 @@ bool CNXDNControl::writeModem(unsigned char *data, unsigned int len)
 
 		// Convert the raw RSSI to dBm
 		int rssi = m_rssiMapper->interpolate(raw);
-		LogDebug("NXDN, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
+		if (rssi != 0)
+			LogDebug("NXDN, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
 
 		// RSSI is always reported as positive
 		m_rssi = (rssi >= 0) ? rssi : -rssi;
diff --git a/P25Control.cpp b/P25Control.cpp
index fc9a440..1ed8bcd 100644
--- a/P25Control.cpp
+++ b/P25Control.cpp
@@ -189,7 +189,8 @@ bool CP25Control::writeModem(unsigned char* data, unsigned int len)
 
 		// Convert the raw RSSI to dBm
 		int rssi = m_rssiMapper->interpolate(raw);
-		LogDebug("P25, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
+		if (rssi != 0)
+			LogDebug("P25, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
 
 		// RSSI is always reported as positive
 		m_rssi = (rssi >= 0) ? rssi : -rssi;
diff --git a/YSFControl.cpp b/YSFControl.cpp
index df4667e..16ad7bf 100644
--- a/YSFControl.cpp
+++ b/YSFControl.cpp
@@ -142,7 +142,8 @@ bool CYSFControl::writeModem(unsigned char *data, unsigned int len)
 
 		// Convert the raw RSSI to dBm
 		int rssi = m_rssiMapper->interpolate(raw);
-		LogDebug("YSF, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
+		if (rssi != 0)
+			LogDebug("YSF, raw RSSI: %u, reported RSSI: %d dBm", raw, rssi);
 
 		// RSSI is always reported as positive
 		m_rssi = (rssi >= 0) ? rssi : -rssi;