diff --git a/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/prefs.xml b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/prefs.xml
new file mode 100644
index 0000000..9c99288
--- /dev/null
+++ b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/prefs.xml
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE map SYSTEM "http://java.sun.com/dtd/preferences.dtd">
+<map MAP_XML_VERSION="1.0"/>
diff --git a/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Beacons/MYCALL/prefs.xml b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Beacons/MYCALL/prefs.xml
new file mode 100644
index 0000000..c2dd1c8
--- /dev/null
+++ b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Beacons/MYCALL/prefs.xml
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE map SYSTEM "http://java.sun.com/dtd/preferences.dtd">
+<map MAP_XML_VERSION="1.0">
+  <entry key="ambiguity" value="1.6666666E-4"/>
+  <entry key="beaconName" value="MYCALL"/>
+  <entry key="ctcss" value="TOFF"/>
+  <entry key="decayRatio" value="2"/>
+  <entry key="digipeaters" value="WIDE1-1;WIDE1-1,WIDE2-1"/>
+  <entry key="directionality" value="0"/>
+  <entry key="enabled" value="true"/>
+  <entry key="fixedAltitudeM" value="NaN"/>
+  <entry key="freeText" value="ETC R3"/>
+  <entry key="gain" value="0"/>
+  <entry key="height" value="0"/>
+  <entry key="initialRateSecs" value="60"/>
+  <entry key="latitude" value="33.0"/>
+  <entry key="longitude" value="-112.0"/>
+  <entry key="monitorFreq" value="0.0"/>
+  <entry key="offset" value="0"/>
+  <entry key="positionType" value="NO_TIME_W_MESSAGING"/>
+  <entry key="power" value="0"/>
+  <entry key="reportAltitude" value="false"/>
+  <entry key="reportSpeed" value="false"/>
+  <entry key="showDFS" value="false"/>
+  <entry key="showPHG" value="false"/>
+  <entry key="slowRateSecs" value="1800"/>
+  <entry key="status" value="7"/>
+  <entry key="symTableId" value="/"/>
+  <entry key="symbolCode" value="["/>
+  <entry key="type" value="POSITION"/>
+  <entry key="useGpsForPosition" value="true"/>
+  <entry key="useWeather" value="false"/>
+</map>
diff --git a/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Beacons/prefs.xml b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Beacons/prefs.xml
new file mode 100644
index 0000000..9c99288
--- /dev/null
+++ b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Beacons/prefs.xml
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE map SYSTEM "http://java.sun.com/dtd/preferences.dtd">
+<map MAP_XML_VERSION="1.0"/>
diff --git a/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/DigipeatAlias/prefs.xml b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/DigipeatAlias/prefs.xml
new file mode 100644
index 0000000..38d870b
--- /dev/null
+++ b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/DigipeatAlias/prefs.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE map SYSTEM "http://java.sun.com/dtd/preferences.dtd">
+<map MAP_XML_VERSION="1.0">
+  <entry key="TEMP1" value="true,false,false"/>
+  <entry key="WIDE1" value="true,false,true"/>
+  <entry key="WIDE2" value="true,false,true"/>
+</map>
diff --git a/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Ports/prefs.xml b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Ports/prefs.xml
new file mode 100644
index 0000000..61b8ec5
--- /dev/null
+++ b/overlay/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Ports/prefs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE map SYSTEM "http://java.sun.com/dtd/preferences.dtd">
+<map MAP_XML_VERSION="1.0">
+  <entry key="Port1" value="KISS-over-TCP,localhost,8001,N0CAL,,true,TEMP1;;true;false;1;0/-120/10;0;MYCALL"/>
+  <entry key="Port2" value="GPSD,localhost,2947,,,false;;true;false;1;0/-120/10;0;"/>
+</map>
diff --git a/overlay/opt/emcomm-tools/bin/et-direwolf b/overlay/opt/emcomm-tools/bin/et-direwolf
index c9cfbd1..239e540 100755
--- a/overlay/opt/emcomm-tools/bin/et-direwolf
+++ b/overlay/opt/emcomm-tools/bin/et-direwolf
@@ -2,6 +2,7 @@
 #
 # Author  : Gaston Gonzalez
 # Date    : 1 November 2024
+# Updated : 3 November 2024
 # Purpose : Wrapper script for starting Dire Wolf with PnP support
 #
 # Preconditions:
@@ -55,6 +56,14 @@ start() {
   update-config
   
   if [ $? -eq 0 ]; then
+
+    RIGCTLD_OUT=$(systemctl status rigctld)
+    if [ $? -ne 0 ]; then
+      et-log "Can't start Dire Wolf. rigctld not running. Ensure radio is selected."
+      notify_user "Can't start Dire Wolf. rigctld not running."
+      exit 1
+    fi
+   
     CMD="direwolf -c ${DIREWOLF_CONF_FILE} -t 0 -p"
     et-log "Starting Dire Wolf with: '${CMD}'"
     echo
diff --git a/overlay/opt/emcomm-tools/bin/et-radio b/overlay/opt/emcomm-tools/bin/et-radio
index d1ba6e2..1754a39 100755
--- a/overlay/opt/emcomm-tools/bin/et-radio
+++ b/overlay/opt/emcomm-tools/bin/et-radio
@@ -2,7 +2,7 @@
 #
 # Author   : Gaston Gonzalez
 # Date     : 11 October 2024
-# Updated  : 28 October 2024
+# Updated  : 3 November 2024
 # Purpose  : A script for managaing plug-and-play radios
 set -e
 
@@ -48,6 +48,9 @@ if [ $exit_status -eq 0 ]; then
 
   printf "\nConfiguration Notes\n"
   cat ${ACTIVE_RADIO} | jq -r '.notes[] | "* \(.)"'
+
+  
+  printf "\n** Plug in radio. If already connected, reconnect it.\n"
 else
   echo "No radio selected."
 fi
diff --git a/overlay/opt/emcomm-tools/bin/et-yaac b/overlay/opt/emcomm-tools/bin/et-yaac
new file mode 100755
index 0000000..94048f3
--- /dev/null
+++ b/overlay/opt/emcomm-tools/bin/et-yaac
@@ -0,0 +1,95 @@
+#!/bin/bash
+#
+# Author  : Gaston Gonzalez
+# Date    : 3 November 2024
+# Purpose : Wrapper script for starting YAAC with PnP support
+#
+# Preconditions:
+# 1. Supported radio and audio interface are connected and properly detected
+# 2. Dire Wolf is started
+#
+# Postconditions:
+# 1. YAAC is started
+# 2. Callsign is updated in YAAC
+
+YAAC_CONF_DIR=${HOME}/.java/.userPrefs/org/ka2ddo/yaac
+YAAC_CONF_FILE_PORTS=${YAAC_CONF_DIR}/Ports/prefs.xml
+YAAC_CONF_FILE_PORTS_TEMPLATE=/etc/skel/.java/.userPrefs/org/ka2ddo/yaac/Ports/prefs.xml
+
+usage() {
+  echo "usage: $(basename $0) <command>"
+  echo "  <command>"
+  echo "    start           - Start YAAC"
+  echo "    update-config   - Update configuration for selected mode"
+}
+
+if [ $# -ne 1 ]; then
+  usage
+  exit 1
+fi
+
+notify_user() {
+  notify-send \
+   -t 5000 \
+   --app-name="EmComm Tools" \
+   "$1"
+}
+
+start() {
+  update-config
+  
+  if [ $? -eq 0 ]; then
+
+    RIGCTLD_OUT=$(ps -ef | grep [d]irewolf)
+    if [ $? -ne 0 ]; then
+      et-log "Can't start YAAC. Dire Wolf not running."
+      notify_user "Can't start YAAC. Dire Wolf not running."
+      exit 1
+    fi
+
+    CMD="java -jar /opt/yaac/YAAC.jar"
+    et-log "Starting YAAC with: ${CMD}"
+
+    ${CMD}
+   
+  else 
+    et-log "Error updating configuration. Can't start YAAC"
+    exit 1
+  fi
+}
+
+update-config () {
+
+    [ -z "$ET_USER_CONFIG" ] && ET_USER_CONFIG="${HOME}/.config/emcomm-tools/user.json"
+
+    CALLSIGN=$(cat ${ET_USER_CONFIG} | jq -r .callsign)
+
+    if [ "${CALLSIGN}" = "N0CALL" ]; then
+      notify_user "Can't start YAAC. No callsign set. Run: et-user."
+      exit 1
+    fi
+
+    et-log "Updating YAAC ports file: ${YAAC_CONF_FILE_PORTS}..."
+    cp -v ${YAAC_CONF_FILE_PORTS_TEMPLATE} ${YAAC_CONF_FILE_PORTS}
+    sed -i "s|N0CAL|${CALLSIGN}|g" ${YAAC_CONF_FILE_PORTS}
+    
+    echo "Generated the configuration below..."
+    echo
+    cat ${YAAC_CONF_FILE_PORTS}
+    echo
+
+}
+
+case $1 in
+  start)
+    start
+    ;;
+  update-config)
+    update-config
+    ;;
+  *)
+    echo "Invalid command."
+    usage
+    exit 1
+  ;;
+esac
diff --git a/scripts/install-base.sh b/scripts/install-base.sh
index daf0d37..c07b837 100755
--- a/scripts/install-base.sh
+++ b/scripts/install-base.sh
@@ -2,7 +2,7 @@
 #
 # Author  : Gaston Gonzalez
 # Date    : 16 March 2024
-# Updated : 6 October 2024
+# Updated : 11 November 2024
 # Purpose : Install base tools and configuration
 set -e
 
@@ -21,7 +21,7 @@ apt install \
   gpg \
   jq \
   net-tools \
-  openjdk-11-jdk \
+  openjdk-20-jdk \
   openssh-server \
   screen \
   stow \
diff --git a/scripts/install-yaac.sh b/scripts/install-yaac.sh
new file mode 100755
index 0000000..2e6e2b3
--- /dev/null
+++ b/scripts/install-yaac.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+# Author  : Gaston Gonzalez
+# Date    : 3 November 2024
+# Purpose : Install YAAC
+set -e
+trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG
+trap 'et-log "\"${last_command}\" command failed with exit code $?."' ERR
+
+VERSION=latest
+ZIP_FILE=YAAC.zip
+INSTALL_DIR=/opt/yaac-${VERSION}
+LINK_PATH=/opt/yaac
+
+et-log "Installing YAAC..."
+
+if [ ! -e ${ET_DIST_DIR}/${ZIP_FILE} ]; then
+
+  URL=https://www.ka2ddo.org/ka2ddo/${ZIP_FILE}
+
+  et-log "Downloading YAAC: ${URL}"
+  curl -s -L -o ${ZIP_FILE} --fail ${URL}
+
+  [ ! -e ${ET_DIST_DIR} ] && mkdir ${ET_DIST_DIR}
+  [ ! -e ${ET_SRC_DIR} ] && mkdir ${ET_SRC_DIR}
+  
+  mv -v ${ZIP_FILE} ${ET_DIST_DIR}
+fi
+
+CWD_DIR=$(pwd)
+
+if [ ! -e ${INSTALL_DIR} ]; then
+  mkdir -v ${INSTALL_DIR} && cd ${INSTALL_DIR}
+  unzip ${ET_DIST_DIR}/${ZIP_FILE}
+else
+  et-log "${INSTALL_DIR} already exists."
+fi
+
+[ -e ${LINK_PATH} ] && rm ${LINK_PATH}
+ln -s ${INSTALL_DIR} ${LINK_PATH}
+
+cd ${CWD_DIR}
diff --git a/scripts/install.sh b/scripts/install.sh
index 9f825a4..7fda58c 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -2,7 +2,7 @@
 #
 # Author  : Gaston Gonzalez
 # Date    : 16 March 2024
-# Updated : 30 October 2024
+# Updated : 3 November 2024
 # Purpose : Main installer for EmComm Tools OS Community
 
 . ./env.sh
@@ -35,6 +35,8 @@ exitIfNotRoot
 
 ./install-conky.sh
 
+# Install packet tool chain
 ./install-direwolf.sh
+./install-yaac.sh
 
 ./install-audio-tools.sh
diff --git a/tests/run-test-suite.sh b/tests/run-test-suite.sh
new file mode 100755
index 0000000..67904b7
--- /dev/null
+++ b/tests/run-test-suite.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+# Author   : Gaston Gonzalez
+# Date     : 3 November 2024
+# Purpose  : Post installation validation script
+
+PATH=.:$PATH
+
+ls test-*.sh | while read test_case; do
+  eval ${test_case}
+  if [[ $? -eq 0 ]]; then
+    printf "%20s %s\n" "${test_case}" "[PASSED]"
+  else
+    printf "%20s %s\n" "${test_case}" "[FAILED]"
+  fi
+done
diff --git a/tests/test-java.sh b/tests/test-java.sh
new file mode 100755
index 0000000..76c3791
--- /dev/null
+++ b/tests/test-java.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+# Author   : Gaston Gonzalez
+# Date     : 3 November 2024
+# Purpose  : Test Java installation
+
+# We need to redirect stderr to stdout otherwise grep will not match.
+JAVA_OUT=$(java -version 2>&1 | grep 20.0.1)
+exit $?