It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Originally posted by gariac
This clip comes from the Groom Lake aircraft "ground frequency." The tones sound like "touch tones", AKA DTMF. Following each DTMF burst is a bit of goofy audio at a much reduced level. The file is raw wave (no compression).
Well, that's all I know. Happy deciphering!
Groom Lake audio puzzle