diff --git a/overlay/etc/udev/rules.d/79-et-generic-remove.rules b/overlay/etc/udev/rules.d/75-et-generic-remove.rules
similarity index 100%
rename from overlay/etc/udev/rules.d/79-et-generic-remove.rules
rename to overlay/etc/udev/rules.d/75-et-generic-remove.rules
diff --git a/overlay/etc/udev/rules.d/79-et-digirig-dr891.rules b/overlay/etc/udev/rules.d/79-et-digirig-dr891.rules
new file mode 100644
index 0000000..62f39b6
--- /dev/null
+++ b/overlay/etc/udev/rules.d/79-et-digirig-dr891.rules
@@ -0,0 +1,37 @@
+# Author   : Gaston Gonzalez
+# Date     : 11 November 2024
+# Purpose  : udev rules for the Yaesu FT-891 via the DigiRig DR-891
+#
+# Preconditions:
+# 1. Yaesu FT-891 is selected via et-radio
+# 2. Yaesu FT-891 is connected via DR-891 USB cable
+#
+# Postconditions:
+# 1. /dev/et-cat created
+# 2. /dev/et-audio created
+# 3. rigctld is started
+# 
+# CAUTION: The FT-891 is an experimental device that may impact the stability of the platform and may
+#          not work 100% of the time. This device support is best effort only.
+
+# Special rule to ensure that the first serial interface (/dev/ttyUSB4) is tagged as ET_DEVICE=FT-891 so
+# that it can be used in the next CAT control rule. The second serial device will not work (/dev/ttyUSB5)
+# if it is incorrectly detected as the /dev/et-cat device.
+KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", PROGRAM="/opt/emcomm-tools/sbin/udev-tester.sh yaesu-ft891", \
+    ATTRS{bInterfaceNumber}=="00", \
+    ENV{ET_DEVICE}="FT-891"
+
+# CAT control device will only match if PROGRAM above matches (exit status=0)
+SUBSYSTEM=="tty", ENV{ET_DEVICE}=="FT-891", \
+    ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea70",\
+    ACTION=="add", \
+    ENV{ET_SUBDEVICE}="CAT", GROUP="dialout", MODE="0660", SYMLINK+="et-cat", \
+    RUN+="/usr/bin/systemctl start rigctld"
+
+# Audio device will only match if PROGRAM above matches (exit status=0)
+SUBSYSTEM=="sound", ATTRS{idVendor}=="0d8c", ATTRS{idProduct}=="0012", \
+    PROGRAM="/opt/emcomm-tools/sbin/udev-tester.sh yaesu-ft891", \
+    ACTION=="add", \
+    ENV{ET_DEVICE}="FT-891", \
+    ATTR{id}="ET_AUDIO", \
+    ENV{ET_SUBDEVICE}="AUDIO", GROUP="audio", MODE="0660", SYMLINK+="et-audio"
diff --git a/overlay/opt/emcomm-tools/bin/et-audio b/overlay/opt/emcomm-tools/bin/et-audio
index 432486e..2f921e5 100755
--- a/overlay/opt/emcomm-tools/bin/et-audio
+++ b/overlay/opt/emcomm-tools/bin/et-audio
@@ -2,7 +2,7 @@
 #
 # Author  : Gaston Gonzalez
 # Date    : 31 October 2024
-# Updated : 4 November 2024
+# Updated : 11 November 2024
 # Purpose : Configures ET audio device with sane defaults
 #
 # Preconditions
@@ -73,6 +73,18 @@ update-config () {
 
            et-log "Applied amixer settings for ${ET_DEVICE_NAME}"
          ;;
+         "FT-891")
+           # Unmute Speaker a set volume. Adjust if remote station can't decode you. Your TX controls.
+           amixer -q -c ${AUDIO_CARD} sset Speaker Playback Switch 42% unmute
+           # Unmute Mic
+           amixer -q -c ${AUDIO_CARD} sset Mic Playback Switch 52% unmute
+           # Set "L/R Capture" to 19. Adjust if you can't decode received audio. Your RX controls.
+           amixer -q -c ${AUDIO_CARD} sset Mic Capture Switch 31% unmute
+           # Disable Auto Gain Control
+           amixer -q -c ${AUDIO_CARD} sset 'Auto Gain Control' mute
+
+           et-log "Applied amixer settings for ${ET_DEVICE_NAME}"
+         ;;
          *)
            et-log "No ALSA configuration specified for this ET_DEVICE."
          ;;
diff --git a/overlay/opt/emcomm-tools/conf/radios.d/digirig-mobile-no-cat.json b/overlay/opt/emcomm-tools/conf/radios.d/digirig-mobile-no-cat.json
index c1ef914..5d8084b 100644
--- a/overlay/opt/emcomm-tools/conf/radios.d/digirig-mobile-no-cat.json
+++ b/overlay/opt/emcomm-tools/conf/radios.d/digirig-mobile-no-cat.json
@@ -8,7 +8,6 @@
   },
   "notes": [
     "Set your VFO manually",
-    "Adjust your volume, RF gain and squelch manually",
-    "This mode uses the RTS signal to trigger the PTT"
+    "Adjust your volume, RF gain and squelch manually"
   ]
 }
diff --git a/overlay/opt/emcomm-tools/conf/radios.d/yaesu-ft891.json b/overlay/opt/emcomm-tools/conf/radios.d/yaesu-ft891.json
new file mode 100644
index 0000000..0f3f4f9
--- /dev/null
+++ b/overlay/opt/emcomm-tools/conf/radios.d/yaesu-ft891.json
@@ -0,0 +1,36 @@
+{
+  "id": "yaesu-ft891",
+  "vendor": "Yaesu",
+  "model": "FT-891 (DR-891)",
+  "rigctrl": {
+    "id": "1036",
+    "baud": "38400",
+    "ptt": "RTS"
+  },
+  "notes": [
+    "05-06 CAT RATE = 38400bps",
+    "05-07 CAT TOT = 100ms",
+    "05-08 CAT RTS = DISABLE",
+    "08-01 DATA MODE = OTHERS",
+    "08-02 PSK TONE = 1500Hz",
+    "08-03 OTHER DISP = 1500Hz",
+    "08-04 OTHER SHIFT = 1500Hz",
+    "08-05 DATA LCUT FREQ = OFF",
+    "08-07 DATA HCUT FREQ = OFF",
+    "08-09 DATA IN SELECT = REAR",
+    "08-10 DATA PTT SELECT = DAKY",
+    "08-11 DATA OUT LEVEL = 50",
+    "08-12 DATA BFO = USB",
+    "11-07 SSB BFO = AUTO",
+    "For digital operation always set Mode = DATA",
+    "For digital operation always set WDH = 3000"
+  ],
+  "fieldNotes": [
+    "Long press [BAND] and select DATA using the VFO knob",
+    "Short press [F] multiple times and stop at FUNCTION-1 screen",
+    "Use the MFK to select WDH",
+    "Short press the MFK, then rotate to set the WDH value to 3000",
+    "Long press [F] to exit",
+    "Set digital output power via menu 16-03."
+  ]
+}
diff --git a/overlay/opt/emcomm-tools/sbin/udev-tester.sh b/overlay/opt/emcomm-tools/sbin/udev-tester.sh
new file mode 100755
index 0000000..781c92a
--- /dev/null
+++ b/overlay/opt/emcomm-tools/sbin/udev-tester.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+# Author  : Gaston Gonzalez
+# Date    : 11 October 2024
+# Purpose : Perform tests that can be used by the udev subsystem to aid
+#           in rule development. This is intended to by used with the PROGRAM
+#           directive inside of a udev rule.
+#
+# Exit Statuses:
+#  0   udev rule should match  
+#  1   udev rule should not match.
+
+ET_HOME=/opt/emcomm-tools
+ACTIVE_RADIO="${ET_HOME}/conf/radios.d/active-radio.json"
+
+# Exit with a 0 exit success if, and only if, the currently selected radio is
+# a Yaesu FT-891.
+test_yaesu_ft891() {
+  if [ -L "${ET_HOME}/conf/radios.d/active-radio.json" ]; then
+    ID=$(cat "${ET_HOME}/conf/radios.d/active-radio.json" | jq -r .id)
+
+    if [[ "$ID" == "yaesu-ft891" ]]; then
+      exit 0
+    fi
+  fi
+  
+  exit 1
+}
+
+usage() {
+  echo "usage: $(basename $0) <radio ID>"
+}
+
+if [ $# -ne 1 ]; then
+  usage
+  exit 1
+fi
+
+case $1 in
+  yaesu-ft891)
+    test_yaesu_ft891
+  ;;
+esac
+
+exit 1