restore aprs functionality

owrx/service/chain.py

@@ -1,6 +1,7 @@
 from csdr.chain import Chain
 from csdr.chain.selector import Selector
 from csdr.chain.demodulator import BaseDemodulatorChain, SecondaryDemodulator, FixedAudioRateChain
+from pycsdr.types import Format
 
 
 class ServiceDemodulatorChain(Chain):
@@ -8,13 +9,16 @@ class ServiceDemodulatorChain(Chain):
         # TODO magic number... check if this edge case even exsists and change the api if possible
         rate = secondaryDemod.getFixedAudioRate() if isinstance(secondaryDemod, FixedAudioRateChain) else 1200
 
-        self.selector = Selector(sampleRate, rate, shiftRate)
+        self.selector = Selector(sampleRate, rate, shiftRate, withSquelch=False)
+
+        workers = [self.selector]
+
+        # primary demodulator is only necessary if the secondary does not accept IQ input
+        if secondaryDemod.getInputFormat() is not Format.COMPLEX_FLOAT:
+            workers += [demod]
+
+        workers += [secondaryDemod]
 
-        workers = [
-            self.selector,
-            demod,
-            secondaryDemod
-        ]
         super().__init__(workers)
 
     def setBandPass(self, lowCut, highCut):