That's a cool experiment and was fun to listen to your UHFRadio.wma clip. I wondered if it would work using your computer speakers, though it's not surprising that the actual Morse Code was not heard. If you listen again; however, you should be able to discern the approximate 7-second interruption in the 1-second cadence. If you know somebody with a hand scanner (like the
Uniden BC125AT), the dash-dot patterns are audible and if you record them, and then look at their graphical representation (like with
Audacity), you can easily decode the dot-dash-dot. Attached is audio and above is the audio decoded.