Adding separate 170Hz (HAM) and 450Hz (DDK) RTTY modes.

csdr/chain/digimodes.py

@@ -112,12 +112,10 @@ class CwDemodulator(SecondaryDemodulator, SecondarySelectorChain):
 
 
 class RttyDemodulator(SecondaryDemodulator, SecondarySelectorChain):
-    def __init__(self, baudRate: float):
-        # Our input "baud rate" is actually frequency shift here
-        # Real RTTY baud rate is different
+    def __init__(self, targetWidth: float, baudRate: float):
         self.sampleRate = 12000
-        self.targetWidth = baudRate
-        self.baudRate = 45.45
+        self.targetWidth = targetWidth
+        self.baudRate = baudRate
         workers = [
             Agc(Format.FLOAT),
             RttyDecoder(self.sampleRate, 0, int(self.targetWidth), self.baudRate),

owrx/dsp.py

@@ -616,9 +616,12 @@ class DspManager(SdrSourceEventClient, ClientDemodulatorSecondaryDspEventClient)
         elif mod == "cwdecoder":
             from csdr.chain.digimodes import CwDemodulator
             return CwDemodulator(75.0)
-        elif mod == "rtty":
+        elif mod == "rtty170":
             from csdr.chain.digimodes import RttyDemodulator
-            return RttyDemodulator(170.0)
+            return RttyDemodulator(170.0, 45.45)
+        elif mod == "rtty450":
+            from csdr.chain.digimodes import RttyDemodulator
+            return RttyDemodulator(450.0, 50.0)
 
     def setSecondaryDemodulator(self, mod):
         demodulator = self._getSecondaryDemodulator(mod)

owrx/modes.py

@@ -139,7 +139,8 @@ class Modes(object):
             squelch=False,
         ),
         DigitalMode("cwdecoder", "CWDecoder", underlying=["usb"]),
-        DigitalMode("rtty", "RTTY", underlying=["usb"]),
+        DigitalMode("rtty170", "RTTY170", underlying=["usb"]),
+        DigitalMode("rtty450", "RTTY450", underlying=["usb"]),
     ]
 
     @staticmethod