diff --git a/src/README-Tetra b/src/README-Tetra
new file mode 100644
index 00000000..f5228c26
--- /dev/null
+++ b/src/README-Tetra
@@ -0,0 +1,38 @@
+*
+* Adi Bier / DL1HRC
+* dl1hrc { at } gmx . de
+*
+
+This branch only works if you have the following things:
+
+- Motorola MTM5x00, MTM800E, MTM800FuG
+- active data cable, e.g. PMKN4104
+- (Sepura/Cleartone my work, but no warranty)
+
+The MS is completely controlled by AT-commands over the PEI interface
+
+Installation instructions from Frédéric/F1IWQ can be found here:
+http://dl.free.fr/getfile.pl?file=/RabtkiOU
+
+
+Here are two quick-and-dirty installation/update documentation, keep 
+in mind: No configuration will be done!
+
+1) first time installation (including German(!) voice announcements):
+
+You may use my semi-automatic installation-script from here 
+http://svxlink.ham-radio-op.net/svxlink/svxlink-tetra-contrib.sh
+
+Start installation as root:
+wget -O - http://svxlink.ham-radio-op.net/svxlink/svxlink-tetra-contrib.sh | bash
+
+
+2) Update an existing tetra-contrib installation made by the previous script 
+as root:
+
+systemctl stop svxlink
+cd /home/svxlink/svxlink/src/build/
+git pull
+make install
+systemctl start svxlink
+
diff --git a/src/svxlink/svxlink/DapNetClient.cpp b/src/svxlink/svxlink/DapNetClient.cpp
index 061df9c5..1a3a7680 100644
--- a/src/svxlink/svxlink/DapNetClient.cpp
+++ b/src/svxlink/svxlink/DapNetClient.cpp
@@ -1,6 +1,6 @@
 /**
 @file	 DapNetClient.cpp
-@brief   Network connection manager for DapNet transceivers
+@brief   Network connection manager for DapNet
 @author  Tobias Blomberg / SM0SVX & Adi Bier / DL1HRC
 @date	 2021-02-07
 
diff --git a/src/svxlink/svxlink/DapNetClient.h b/src/svxlink/svxlink/DapNetClient.h
index 90f0fd8b..4055096d 100644
--- a/src/svxlink/svxlink/DapNetClient.h
+++ b/src/svxlink/svxlink/DapNetClient.h
@@ -1,6 +1,6 @@
 /**
 @file	 DapNetClient.h
-@brief   Network connection for DapNetClient transceivers
+@brief   Network connection manager for DapNet
 @author  Tobias Blomberg / SM0SVX & Adi Bier / DL1HRC
 @date	 2021-02-07
 
diff --git a/src/svxlink/svxlink/TetraLib.h b/src/svxlink/svxlink/TetraLib.h
index 78e2da31..6862c306 100644
--- a/src/svxlink/svxlink/TetraLib.h
+++ b/src/svxlink/svxlink/TetraLib.h
@@ -490,7 +490,6 @@ void handleLipSds(std::string in, LipInfo &lipinfo)
     {
       lipinfo.longitude = tlo * 360.0 / 33554432;
     }
-    //std::cout << "tlo=" << tlo << ",lipinfo.longitude=" << lipinfo.longitude << std::endl;
 
     if (tla > 8388608)
     {
@@ -500,7 +499,6 @@ void handleLipSds(std::string in, LipInfo &lipinfo)
     {
       lipinfo.latitude = tla * 360.0 / 33554432;
     }
-    //std::cout << "tla=" << tla << ",lipinfo.latitude=" << lipinfo.latitude << std::endl;
 
     // position error in meter
     lipinfo.positionerror = 2*pow(10,(std::stoi(in.substr(15,1),nullptr,16) & 0x03));
@@ -756,6 +754,12 @@ std::string getNextStr(std::string& h)
 std::string getPeiError(int errorcode)
 {
 
+  if (errorcode > 45)
+  {
+    std::stringstream ss;
+    ss << "Unknown Error occured (" << errorcode << ")" << std::endl;
+    return ss.str();
+  }
 std::string error[] = {
 "0 - The MT was unable to send the data over the air (e.g. to the SwMI)",
 "1 - The MT can not establish a reliable communication with the TE",