Hey everyone just to clear up some confusion here. Unfortunately Zabuzard was slightly incorrect here.
The ALR-46 has a separate set of electronics for detecting C and D band guidance commands that which are commonly found on soviet SAM systems. These signals can be detected and correlated with a threat to give you a launch warning, or warn if there is launch related activity.
The RWR can also indicate PRF (Pulse Repetition Frequency) changes which occur during search/tracking changes. These will be indicated by the new guy audio which plays 3 short beeps at the PRF of the emitter. A diamond is also shown around the new guy producing the new guy audio. Currently the new guy audio is bugged and not displaying the diamond and the audio being played is wrong, these will be fixed in patches soon.
Lastly the RWR can categorise known active missile threats, these will be displayed and trigger a launch warning - currently this feature is in testing but not in the public version.
Thanks, Hopefully that is clearer.
Handoff plays the captured pulse train information continuously, unfortunately the raw audio produced by the SAM sweep patterns and change in amplitude unfortunately cannot be heard.
There appears to be a power sync bug right now. After cold starting (and having the gens on) have your gunner hop out of the aircraft and then hop back in, this will resolve the power desync.
JNelson's post in RWR launch warning was marked as the answer