I know you know NSA, that I'm a newbie, I wish I had heard my Dad back in 1985 , and went deep on computing... but you know that I'm not stupid...actually no white noise solve my problems ...I can tape the frequency of the PC , just approaching the audio jack to the timer module, and I record the tape , and run it on media player...the very basics of jamming. If i wouldn't be a newbie, then i would use an oscillator app, and decode your sign.