[EAS] Dual attention tones

[Dave Turnmire]

I have a mystery that I'm wondering if anyone has noted elsewhere.  I 
have a couple DASDEC decoders in a couple different cities.  To the best 
of my knowledge, their monitoring sources all use SAGE ENDECs, with the 
exception of the State Relay Network (SRN), whose sources are usually 
MTS software/PC.  Based upon the recorded WAV files, as well as what is 
actually forwarded on the air, both of these DASDECs indicate on a 
fairly regular basis that we are receiving TWO attention tones with an 
alert... typically back-to-back and sometimes with a couple seconds gap 
between.  Often with the second tone noticeably louder than the first.  
I haven't observed this when monitoring the SRN directly... but only one 
of our sites monitors the SRN directly, so it might be just a coincidence.

Has anyone else ran into this symptom?  At this point, since I'm seldom 
in a position to listen to the incoming signal in real time, I'm 
uncertain whether those dual tones are REALLY being broadcast by our 
monitored sources (thus likely a SAGE issue)... or whether they are 
being created for some reason by our DASDECs.  Or some other scenario 
that escapes me.  But since we are experiencing this in two widely 
separated markets with different hardware (same model, different 
firmware), it makes me think perhaps it is a symptom of a wider issue.

So... anyone else run into this or have any particular input on it?

Thanks

Dave