diff --git a/csdr/chain/m17.py b/csdr/chain/m17.py
new file mode 100644
index 0000000..4c21d47
--- /dev/null
+++ b/csdr/chain/m17.py
@@ -0,0 +1,26 @@
+from csdr.chain.demodulator import BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain
+from owrx.m17 import M17Module
+from pycsdr.modules import FmDemod, Limit, Convert
+from pycsdr.types import Format
+from digiham.modules import DcBlock
+
+
+class M17Chain(BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain):
+    def __init__(self):
+        workers = [
+            FmDemod(),
+            DcBlock(),
+            Limit(),
+            Convert(Format.FLOAT, Format.SHORT),
+            M17Module(),
+        ]
+        super().__init__(workers)
+
+    def getFixedIfSampleRate(self) -> int:
+        return 48000
+
+    def getFixedAudioRate(self) -> int:
+        return 8000
+
+    def supportsSquelch(self) -> bool:
+        return False
diff --git a/csdr/module.py b/csdr/module.py
index b12d950..efd5c1f 100644
--- a/csdr/module.py
+++ b/csdr/module.py
@@ -28,12 +28,7 @@ class Module(BaseModule, metaclass=ABCMeta):
         pass
 
 
-class ThreadModule(Module, Thread, metaclass=ABCMeta):
-    def __init__(self):
-        self.doRun = True
-        super().__init__()
-        Thread.__init__(self)
-
+class AutoStartModule(Module, metaclass=ABCMeta):
     def _checkStart(self) -> None:
         if self.reader is not None and self.writer is not None:
             self.start()
@@ -46,6 +41,17 @@ class ThreadModule(Module, Thread, metaclass=ABCMeta):
         super().setWriter(writer)
         self._checkStart()
 
+    @abstractmethod
+    def start(self):
+        pass
+
+
+class ThreadModule(AutoStartModule, Thread, metaclass=ABCMeta):
+    def __init__(self):
+        self.doRun = True
+        super().__init__()
+        Thread.__init__(self)
+
     @abstractmethod
     def run(self):
         pass
@@ -54,6 +60,9 @@ class ThreadModule(Module, Thread, metaclass=ABCMeta):
         self.doRun = False
         self.reader.stop()
 
+    def start(self):
+        Thread.start(self)
+
 
 class PickleModule(ThreadModule):
     def getInputFormat(self) -> Format:
diff --git a/owrx/aprs/module.py b/owrx/aprs/module.py
index 5e559b0..ddbbde6 100644
--- a/owrx/aprs/module.py
+++ b/owrx/aprs/module.py
@@ -1,4 +1,4 @@
-from csdr.module import Module
+from csdr.module import AutoStartModule
 from pycsdr.types import Format
 from pycsdr.modules import Reader, Writer, TcpSource
 from subprocess import Popen, PIPE
@@ -12,7 +12,7 @@ import logging
 logger = logging.getLogger(__name__)
 
 
-class DirewolfModule(Module):
+class DirewolfModule(AutoStartModule):
     def __init__(self, service: bool = False):
         self.process = None
         self.inputReader = None
@@ -20,10 +20,6 @@ class DirewolfModule(Module):
         self.service = service
         super().__init__()
 
-    def setReader(self, reader: Reader) -> None:
-        super().setReader(reader)
-        self.start()
-
     def setWriter(self, writer: Writer) -> None:
         super().setWriter(writer)
         if self.tcpSource is not None:
diff --git a/owrx/dsp.py b/owrx/dsp.py
index 71c94a6..81c0e09 100644
--- a/owrx/dsp.py
+++ b/owrx/dsp.py
@@ -12,6 +12,7 @@ from csdr.chain.selector import Selector
 from csdr.chain.clientaudio import ClientAudioChain
 from csdr.chain.analog import NFm, WFm, Am, Ssb
 from csdr.chain.digiham import DigihamChain, Dmr, Dstar, Nxdn, Ysf
+from csdr.chain.m17 import M17Chain
 from csdr.chain.fft import FftChain
 from csdr.chain.digimodes import AudioChopperDemodulator, PacketDemodulator, PocsagDemodulator
 from pycsdr.modules import Buffer, Writer
@@ -425,25 +426,24 @@ class DspManager(Output, SdrSourceEventClient):
         if isinstance(demod, BaseDemodulatorChain):
             return demod
         # TODO: move this to Modes
-        demodChain = None
         if demod == "nfm":
-            demodChain = NFm(self.props["output_rate"])
+            return NFm(self.props["output_rate"])
         elif demod == "wfm":
-            demodChain = WFm(self.props["hd_output_rate"], self.props["wfm_deemphasis_tau"])
+            return WFm(self.props["hd_output_rate"], self.props["wfm_deemphasis_tau"])
         elif demod == "am":
-            demodChain = Am()
+            return Am()
         elif demod in ["usb", "lsb", "cw"]:
-            demodChain = Ssb()
+            return Ssb()
         elif demod == "dmr":
-            demodChain = Dmr(self.props["digital_voice_codecserver"])
+            return Dmr(self.props["digital_voice_codecserver"])
         elif demod == "dstar":
-            demodChain = Dstar(self.props["digital_voice_codecserver"])
+            return Dstar(self.props["digital_voice_codecserver"])
         elif demod == "ysf":
-            demodChain = Ysf(self.props["digital_voice_codecserver"])
+            return Ysf(self.props["digital_voice_codecserver"])
         elif demod == "nxdn":
-            demodChain = Nxdn(self.props["digital_voice_codecserver"])
-
-        return demodChain
+            return Nxdn(self.props["digital_voice_codecserver"])
+        elif demod == "m17":
+            return M17Chain()
 
     def setDemodulator(self, mod):
         demodulator = self._getDemodulator(mod)
diff --git a/owrx/m17.py b/owrx/m17.py
new file mode 100644
index 0000000..d4c6944
--- /dev/null
+++ b/owrx/m17.py
@@ -0,0 +1,42 @@
+from csdr.module import AutoStartModule
+from pycsdr.types import Format
+from subprocess import Popen, PIPE
+import threading
+
+
+class M17Module(AutoStartModule):
+    def __init__(self):
+        self.process = None
+        super().__init__()
+
+    def getInputFormat(self) -> Format:
+        return Format.SHORT
+
+    def getOutputFormat(self) -> Format:
+        return Format.SHORT
+
+    def start(self):
+        self.process = Popen(["m17-demod"], stdin=PIPE, stdout=PIPE)
+        threading.Thread(target=self.pump(self.reader.read, self.process.stdin.write)).start()
+        threading.Thread(target=self.pump(self.process.stdout.read, self.writer.write)).start()
+
+    def stop(self):
+        if self.process is not None:
+            self.process.terminate()
+            self.process.wait()
+            self.process = None
+        self.reader.stop()
+
+    def pump(self, read, write):
+        def copy():
+            while True:
+                data = None
+                try:
+                    data = read()
+                except ValueError:
+                    pass
+                if data is None or isinstance(data, bytes) and len(data) == 0:
+                    break
+                write(data)
+
+        return copy
diff --git a/owrx/service/__init__.py b/owrx/service/__init__.py
index 3a7d2f1..d6d6698 100644
--- a/owrx/service/__init__.py
+++ b/owrx/service/__init__.py
@@ -273,13 +273,10 @@ class ServiceHandler(SdrSourceEventClient):
         if isinstance(demod, BaseDemodulatorChain):
             return demod
         # TODO: move this to Modes
-        demodChain = None
         if demod == "nfm":
-            demodChain = NFm(48000)
+            return NFm(48000)
         elif demod in ["usb", "lsb", "cw"]:
-            demodChain = Ssb()
-
-        return demodChain
+            return Ssb()
 
     # TODO move this elsewhere
     def _getSecondaryDemodulator(self, mod):