diff --git a/chirp/drivers/tk481.py b/chirp/drivers/tk481.py
new file mode 100644
index 00000000..5cc9ee60
--- /dev/null
+++ b/chirp/drivers/tk481.py
@@ -0,0 +1,361 @@
+# Copyright 2024 Dan Smith <chirp@f.danplanet.com>
+#
+# 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
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from collections import namedtuple
+import logging
+
+from chirp import bitwise
+from chirp import chirp_common
+from chirp import directory
+from chirp.drivers import tk280
+from chirp.settings import RadioSetting, RadioSettingSubGroup
+from chirp.settings import RadioSettingValueBoolean, RadioSettingValueString
+
+TRUNK_DEFS = """
+struct trunk_settings {
+    ul16 sys_start[32];
+    u8 systems;
+};
+"""
+
+MEM_FORMAT = tk280.DEFS + TRUNK_DEFS + """
+struct trunk_settings trunk;
+
+#seekto 0x004A;
+lbit system_lockout[32];
+lbit trunk_systems[32]; // 1 if system is trunking, 0 if conventional
+
+#seekto 0x005C;
+struct {
+    u16 first_system;
+    u16 last_system; // nope
+} state;
+
+#seekto 0x0082;
+struct settings settings;
+
+#seekto 0x0110;
+struct keys keys;
+
+#seekto 0x1E7;
+struct misc misc;
+
+struct system {
+  u8 system;
+  u8 channels;
+  u8 unknown1;
+  char name[10];
+  u8 unknown2;
+  u8 unknown3;
+  u8 unknown4;
+  u8 unknown5[16];
+};
+
+struct channel {
+  u8 number;
+  lbcd rxfreq[4];
+  lbcd txfreq[4];
+  u8 unknown_rx:4,
+     rx_step:4; // 0x5
+  u8 unknown_tx:4,
+     tx_step:4; // 0x5
+  ul16 rx_tone;
+  ul16 tx_tone;
+  char name[10];
+  u8 unknown4; // 0xFF
+  u8 unknown4_1:4,
+     power:1, // 0=low, 1=high
+     unknown4_2:3;
+  u8 unknown5_1:2,
+     talkaround:1, // 1=No, 0=Yes
+     call:1,   // 1=No, 0=Yes
+     unknown5_2:1,
+     grouplockout:1, // 1=No, 0=Yes
+     unknown5_3:2; //0xFB
+  u8 unknown6[4]; // 0xFF
+};
+"""
+
+LOG = logging.getLogger(__name__)
+SystemDef = namedtuple('SystemDef', ('index', 'number'))
+
+
+@directory.register
+class TK481_Radios(tk280.KenwoodTKx80):
+    MODEL = 'TK-481'
+    TYPE = b'PG481'
+    POWER_LEVELS = [chirp_common.PowerLevel("Low", watts=1),
+                    chirp_common.PowerLevel("High", watts=2.5)]
+    _range = [(896000000, 941000000)]
+    _steps = chirp_common.COMMON_TUNING_STEPS + (6.25, 12.5)
+    _system = 0
+
+    def process_mmap(self):
+        memobj = bitwise.parse(MEM_FORMAT, self._mmap)
+        first = memobj.state.first_system
+
+        my_format = MEM_FORMAT + '#seekto 0x%04x;\n' % first
+        for i in range(32):
+            start = memobj.trunk.sys_start[i]
+            if start == 0xFFFF:
+                # Not used
+                continue
+            # We need to know how many channels each system has in some easy-
+            # to-calculate way without having to parse all the headers. To
+            # avoid another intermediate parse, just grab the start and add
+            # one for the number of channels count.
+            count = self._mmap[start + 1][0]
+            sys_format = (
+                "struct { \n"
+                "  struct system sys;\n"
+                "  struct channel channels[0x%x];\n"
+                "} system%i;\n") % (count, i)
+            my_format += sys_format
+        self._memobj = bitwise.parse(my_format, self._mmap)
+
+    def _get_system_info(self, index):
+        if self._memobj.trunk.sys_start[index] == 0xFFFF:
+            raise IndexError('No such system')
+        system = getattr(self._memobj, 'system%i' % index)
+        system_start = self._memobj.trunk.sys_start[index]
+        system_end = system_start + (32 * (system.sys.channels + 1))
+        return system_start, system_end, system
+
+    def _expand_system(self, system_number, amount=1):
+        """Expand a system to make more room for memories"""
+
+        my_index = system_number - 1
+        try:
+            system_start, system_end, system = self._get_system_info(my_index)
+            system.sys.channels += amount
+        except IndexError:
+            system = None
+            # If we're the first, we'll start at beginning of memory
+            system_start = 0x0300
+            # Find first used system before me, grab its start+size
+            for i in range(my_index):
+                try:
+                    _, system_start, _ = self._get_system_info(i)
+                except IndexError:
+                    continue
+            LOG.debug('Allocating new system %i at 0x%04x',
+                      my_index, system_start)
+            # An empty system has only the 32-byte header
+            system_end = system_start + 32
+
+        # Add space to all the system starts after this one
+        for index in reversed(range(32)):
+            if index > my_index:
+                if self._memobj.trunk.sys_start[index] == 0xFFFF:
+                    continue
+                self._memobj.trunk.sys_start[index] += (amount * 32)
+            elif index == my_index:
+                self._memobj.trunk.sys_start[index] = system_start
+
+        # Calculate the new end of the system we need to expand:
+        # number of channels (plus one for the system header), 32 bytes each
+        new_end = system_end + (amount * 32)
+
+        # Copy everything to the new location
+        self._mmap[new_end] = self._mmap[system_end:-(amount * 32)]
+
+        # Clear the new hole and add to the channels
+        self._mmap[system_end] = b'\xFF' * 32 * amount
+
+        # If we allocated a new system, bootstrap the channel count, mark as
+        # non-trunked, increase the total system count
+        if system is None:
+            self._mmap[system_start + 1] = amount
+            self._memobj.trunk_systems[my_index] = 0
+            self._memobj.trunk.systems += 1
+
+        # Rebuild the internal memory object
+        self.process_mmap()
+        LOG.debug('Expanded system %i index %i to %i channels '
+                  '(start 0x%04x new end %04x)',
+                  system_number, my_index,
+                  system and system.sys.channels or amount,
+                  system_start, new_end)
+
+        return getattr(self._memobj, 'system%i' % my_index)
+
+    def _reduce_system(self, system_number, channel):
+        """Remove a memory slot from a system"""
+
+        my_index = system_number - 1
+        system_start, system_end, system = self._get_system_info(my_index)
+
+        # Shift memories up in the system, or fail before accounting if we
+        # do not find the one specified
+        found_channel = False
+        for i in range(0, system.sys.channels):
+            if system.channels[i].number == channel:
+                found_channel = True
+            elif found_channel:
+                system.channels[i - 1].set_raw(system.channels[i].get_raw())
+        if not found_channel:
+            raise IndexError('Memory %i not mapped' % channel)
+
+        # Remove space from all the system starts after this one
+        for index in reversed(range(32)):
+            if index > my_index:
+                if self._memobj.trunk.sys_start[index] == 0xFFFF:
+                    continue
+                self._memobj.trunk.sys_start[index] -= 32
+
+        # Calculate the new end of the system we need to expand:
+        # number of channels (plus one for the system header), 32 bytes each
+        new_end = system_end - 32
+
+        # Copy everything to the new location
+        self._mmap[new_end] = self._mmap[system_end:]
+
+        # Clear the hole at the end (if necessary) and decrement the channels
+        self._mmap[-32] = b'\xFF' * 32
+        system.sys.channels -= 1
+
+        # Rebuild the internal memory object
+        self.process_mmap()
+        LOG.debug('Reduced system %i index %i to %i channels '
+                  '(start 0x%04x new end %04x)',
+                  system_number, my_index,
+                  system.sys.channels, system_start, new_end)
+
+    def get_features(self):
+        rf = super().get_features()
+        rf.memory_bounds = (1, 250)
+        # These are all NFM only?
+        rf.valid_modes = ['NFM']
+        rf.valid_skips = ['', 'S']
+        return rf
+
+    def get_sub_devices(self):
+        return [TK481System(i + 1, self)
+                for i in range(32)
+                if self._memobj.trunk.sys_start[i] != 0xFFFF]
+
+    def _get_memory(self, number):
+        system = getattr(self._memobj, 'system%i' % (self._system - 1))
+        for i in range(system.sys.channels):
+            if int(system.channels[i].number) == number:
+                return system.channels[i]
+        raise IndexError('Memory %i not mapped' % number)
+
+    def get_raw_memory(self, number):
+        return repr(self._get_memory(number))
+
+    def get_memory(self, number):
+        mem = chirp_common.Memory()
+        try:
+            _mem = self._get_memory(number)
+        except IndexError:
+            mem.number = number
+            mem.empty = True
+            return mem
+        self._get_memory_base(mem, _mem)
+        mem.mode = 'NFM'
+        mem.skip = '' if bool(_mem.grouplockout) else 'S'
+        return mem
+
+    def set_memory(self, mem):
+        try:
+            _mem = self._get_memory(mem.number)
+        except IndexError:
+            system = self._parent._expand_system(self._system)
+            _mem = system.channels[system.sys.channels - 1]
+
+        if mem.empty:
+            self._parent._reduce_system(self._system, mem.number)
+            return
+
+        self._set_memory_base(mem, _mem)
+
+        _mem.talkaround = 0 if not mem.duplex else 1
+        _mem.grouplockout = 1 if mem.skip == '' else 0
+
+    def _set_settings_groups(self, settings):
+        for i in range(32):
+            try:
+                enabled = settings['system-%i-enable' % i].value
+            except KeyError:
+                enabled = True
+            try:
+                name = str(settings['system-%i-name' % i].value)
+            except KeyError:
+                name = None
+            try:
+                _, _, system = self._get_system_info(i)
+            except IndexError:
+                if enabled:
+                    new_system = self._expand_system(i + 1)
+                    new_system.sys.name = ('System %i' % (i + 1)).ljust(10)
+            else:
+                if name is not None:
+                    system.sys.name = name
+
+    def _get_settings_groups(self, groups):
+        groups.set_shortname('Systems')
+        for i in range(32):
+            rsg = RadioSettingSubGroup('system-%i' % i, 'System %i' % (i + 1))
+            rse = RadioSetting('system-%i-enable' % i, 'Enabled',
+                               RadioSettingValueBoolean(
+                                   self._memobj.trunk.sys_start[i] != 0xFFFF))
+            rse.set_volatile(True)
+            rse.set_doc('Requires reload of file after changing!')
+            if rse.value:
+                # FIXME: Don't allow deleting systems yet
+                rse.value.set_mutable(False)
+            rsg.append(rse)
+            if rse.value:
+                _, _, system = self._get_system_info(i)
+                name = str(system.sys.name)
+            else:
+                name = ''
+
+            rs = RadioSetting('system-%i-name' % i, 'Name',
+                              RadioSettingValueString(0, 10, name))
+            rs.value.set_mutable(bool(rse.value))
+            rsg.append(rs)
+
+            rs = RadioSetting('system-%i-lockout' % i, 'Scan',
+                              RadioSettingValueBoolean(
+                                  self._memobj.system_lockout[i]))
+            rs.value.set_mutable(bool(rse.value))
+            rsg.append(rs)
+            groups.append(rsg)
+
+    # FIXME: Not yet decoded
+    def _get_settings_fsync(self, optfeat2):
+        return
+
+    def _get_settings_ost(self, ost):
+        return
+
+    def _get_settings_format(self, optfeat1, optfeat2, scaninf):
+        return
+
+
+class TK481System(TK481_Radios):
+    def __init__(self, system, parent):
+        self._system = system
+        self._parent = parent
+        self.VARIANT = str(
+            getattr(self._memobj,
+                    'system%i' % (system - 1)).sys.name).strip()
+        self.TYPE = parent.TYPE
+
+    @property
+    def _memobj(self):
+        return self._parent._memobj
diff --git a/tests/images/Kenwood_TK-481.img b/tests/images/Kenwood_TK-481.img
new file mode 100644
index 00000000..26e8eb5b
Binary files /dev/null and b/tests/images/Kenwood_TK-481.img differ