diff --git a/overlay/etc/skel/.config/systemd/user/et-service-mercury-winlink.service b/overlay/etc/skel/.config/systemd/user/et-service-mercury-winlink.service
new file mode 100644
index 0000000..24bbef7
--- /dev/null
+++ b/overlay/etc/skel/.config/systemd/user/et-service-mercury-winlink.service
@@ -0,0 +1,20 @@
+# Author  : Gaston Gonzalez
+# Date    : 12 August 2026
+# Purpose : User systemd unit file for EmComm Tools that starts mercury
+#         : in a Winlink configuration.
+#
+# Usage: 
+#  Check status       : systemctl --user status et-service-mercury-winlink
+#  Start service      : systemctl --user start et-service-mercury-winlink
+#  Stop service       : systemctl --user stop et-service-mercury-winlink
+#  Reload this config : systemctl --user daemon-reload
+
+[Unit]
+Description=EmComm Tools mercury default service for winlink performance
+
+[Service]
+ExecStart=/opt/emcomm-tools/bin/et-mercury winlink
+Restart=no
+
+[Install]
+WantedBy=multi-user.target
diff --git a/overlay/etc/skel/.config/systemd/user/et-service-winlink-mercury.service b/overlay/etc/skel/.config/systemd/user/et-service-winlink-mercury.service
new file mode 100644
index 0000000..d1f5c39
--- /dev/null
+++ b/overlay/etc/skel/.config/systemd/user/et-service-winlink-mercury.service
@@ -0,0 +1,19 @@
+# Author  : Gaston Gonzalez
+# Date    : 12 August 2026
+# Purpose : User systemd unit file for EmComm Tools Winlink over Mercury HF
+#
+# Usage: 
+#  Check status       : systemctl --user status et-service-winlink-mercury
+#  Start service      : systemctl --user start et-service-winlink-mercury
+#  Stop service       : systemctl --user stop et-service-winlink-mercury
+#  Reload this config : systemctl --user daemon-reload
+
+[Unit]
+Description=EmComm Tools Winlink ARDOP service
+
+[Service]
+ExecStart=/opt/emcomm-tools/bin/et-winlink start-mercury-hf
+Restart=no
+
+[Install]
+WantedBy=multi-user.target
diff --git a/overlay/opt/emcomm-tools/bin/et-kill-all b/overlay/opt/emcomm-tools/bin/et-kill-all
index 35c1a77..13fcd43 100755
--- a/overlay/opt/emcomm-tools/bin/et-kill-all
+++ b/overlay/opt/emcomm-tools/bin/et-kill-all
@@ -2,7 +2,7 @@
 #
 # Author   : Gaston Gonzalez
 # Date     : 12 November 2024
-# Updated  : 16 July 2026
+# Updated  : 12 August 2026
 # Purpose  : Stops all EmComm Tools soundcard-based services (i.e. modems)
 #            and radio applications to ensure a clean start for the next mode.
 
@@ -19,6 +19,7 @@ stop_pat() {
 # 2. Stop the applications first, then the modems.
 stop_all_services() {
   systemctl --user stop et-service-winlink-ardop
+  systemctl --user stop et-service-winlink-mercury
   systemctl --user stop et-service-winlink-packet
   systemctl --user stop et-service-winlink-native-packet
   systemctl --user stop et-service-ardop
@@ -41,6 +42,7 @@ stop_all_services() {
   systemctl --user stop et-service-mercury-balanced
   systemctl --user stop et-service-mercury-reliability
   systemctl --user stop et-service-mercury-fast
+  systemctl --user stop et-service-mercury-winlink
 
   # Stop VARA with a sledge hammer
   pkill et-winlink
diff --git a/overlay/opt/emcomm-tools/bin/et-mercury b/overlay/opt/emcomm-tools/bin/et-mercury
index 7f625a4..a51401d 100755
--- a/overlay/opt/emcomm-tools/bin/et-mercury
+++ b/overlay/opt/emcomm-tools/bin/et-mercury
@@ -2,7 +2,7 @@
 #
 # Author  : Gaston Gonzalez
 # Date    : 16 July 2026
-# Updated : 17 July 2026
+# Updated : 12 August 2026
 # Purpose : Wrapper script for starting Mercury with PnP support
 #
 # Preconditions:
@@ -29,6 +29,7 @@ usage() {
   echo "    reliability - Max reliability (Slower Speed) [DATAC1]"
   echo "    balanced    - Balanced (Reliability and Speed) [DATAC17]"
   echo "    fast        - Fast (Low Reliability) [QAM16C2]"
+  echo "    winlink     - Used for Winlink [DATAC3]"
 }
 
 if [[ $# -ne 1 ]]; then
@@ -43,6 +44,9 @@ case "${MODE}" in
   reliability)
     MODE_INDEX="0"
   ;;
+  winlink)
+    MODE_INDEX="1"
+  ;;
   balanced)
     MODE_INDEX="9"
     et-log "Mode not yet supported."
diff --git a/overlay/opt/emcomm-tools/bin/et-mode b/overlay/opt/emcomm-tools/bin/et-mode
index be31cff..d4bb6bf 100755
--- a/overlay/opt/emcomm-tools/bin/et-mode
+++ b/overlay/opt/emcomm-tools/bin/et-mode
@@ -2,7 +2,7 @@
 #
 # Author   : Gaston Gonzalez
 # Date     : 6 November 2024
-# Updated  : 14 June 2026
+# Updated  : 12 August 2026
 # Purpose  : Configures the system for a specific mode of operation
 
 # Use a simple text file to save the state of the last mode selected
@@ -20,6 +20,7 @@ MODE_ID_BBS_SERVER="bbs-server"
 MODE_ID_CHAT_CLIENT="chat-chattervox" 
 MODE_ID_PACKET_DIGIPEATER="packet-digipeater" 
 MODE_ID_WINLINK_ARDOP="winlink-ardop" 
+MODE_ID_WINLINK_MERCURY="winlink-mercury" 
 MODE_ID_WINLINK_PACKET="winlink-packet" 
 MODE_ID_WINLINK_VARA_HF="winlink-vara-hf" 
 MODE_ID_WINLINK_VARA_FM="winlink-vara-fm" 
@@ -150,6 +151,7 @@ if [ -e "${HOME}/.wine32/drive_c/VARA FM/VARAFM.exe" ]; then
   options+=("${MODE_ID_WINLINK_VARA_FM}" "Winlink over VHF/UHF (VARA FM)")
 fi
 
+options+=("${MODE_ID_WINLINK_MERCURY}" "Winlink over HF  (Mercury)")
 options+=("${MODE_ID_WINLINK_ARDOP}" "Winlink over HF (ARDOP)")
 
 if [ -e "${HOME}/.wine32/drive_c/VARA/VARA.exe" ]; then
@@ -250,6 +252,12 @@ if [ $exit_status -eq 0 ]; then
       start_and_wait_for_service et-service-winlink-ardop
       min http://localhost:8080
     ;;
+    ${MODE_ID_WINLINK_MERCURY}) 
+      et-log "Using Mercury as the modem."
+      start_and_wait_for_service et-service-mercury-winlink
+      start_and_wait_for_service et-service-winlink-mercury
+      min http://localhost:8080
+    ;;
     ${MODE_ID_WINLINK_PACKET})
       start_and_wait_for_service et-service-direwolf-simple 
       start_and_wait_for_service et-service-winlink-packet
diff --git a/overlay/opt/emcomm-tools/bin/et-winlink b/overlay/opt/emcomm-tools/bin/et-winlink
index 1089a8b..1494425 100755
--- a/overlay/opt/emcomm-tools/bin/et-winlink
+++ b/overlay/opt/emcomm-tools/bin/et-winlink
@@ -2,7 +2,7 @@
 #
 # Author  : Gaston Gonzalez
 # Date    : 4 November 2024
-# Updated : 4 February 2025
+# Updated : 12 August 2026
 # Purpose : Wrapper script for starting YAAC with PnP support
 #
 # Preconditions:
@@ -26,6 +26,7 @@ usage() {
   echo "    start-native-packet - Start Pat Winlink in native AX.25 packet mode"
   echo "    start-vara-fm       - Start Pat Winlink in VARA FM mode"
   echo "    start-vara-hf       - Start Pat Winlink in VARA HF mode"
+  echo "    start-mercury-hf    - Start Pat Winlink in Mercury HF mode"
 }
 
 if [ $# -ne 1 ]; then
@@ -112,6 +113,16 @@ start_vara_hf() {
   ${CMD}
 }
 
+start_mercury_hf() {
+ 
+  update_config mercury-hf
+
+  CMD="pat http"
+  et-log "Starting Pat with: ${CMD}"
+
+  ${CMD}
+}
+
 update_config () {
 
   [ -z "$ET_USER_CONFIG" ] && ET_USER_CONFIG="${HOME}/.config/emcomm-tools/user.json"
@@ -141,6 +152,9 @@ update_config () {
     vara-hf)
       PAT_CONF_FILE_TEMPLATE=/opt/emcomm-tools/conf/template.d/winlink/config.vara-hf.json
       ;;
+    mercury-hf)
+      PAT_CONF_FILE_TEMPLATE=/opt/emcomm-tools/conf/template.d/winlink/config.vara-hf.json
+      ;;
   esac
 
   et-log "Updating Pat configuration file: ${PAT_CONF_FILE}..."
@@ -167,6 +181,9 @@ case $1 in
   start-vara-hf)
     start_vara_hf
     ;;
+  start-mercury-hf)
+    start_mercury_hf
+    ;;
   *)
     echo "Invalid command."
     usage