Use the SkyKing products for the signal processing, cut off it's sounder and replace it with an appropriate detector/amplifier for the siren.
If you're lucky they use a piezo that just needs power, and all you'll have to do is switch a transistor with it. If you're not lucky, they'll give some AC signal to the piezo, and you'll have to rectify and amplify it.
Maybe if I could just understand the signals coming form the receiver, I could hook up a relay to the very loud radio shack siren. The siren must have 12 volts. I am a software engineer.
The signal from the receiver to the servo is a pulse that ranges from about
1mS to 2mS and the servo gets somewhere around 40-50 pulses per second, IIRC. Perhaps a diode to resistor to charge a capacitor to a comparator circuit would trigger when no pulses are present.RogerN
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