> Sounds like medium to high speed data-specifically it sounds like 
a 
> control channel from a trunked system, or maybe a mobile data 
terminal 
> system, or cellular...

I didn't see anything in the spectrogram that would lead me to that. 
I didn't see any steppiness or distinct components other than hum 
and PL tone.

I just uploaded to ken's, two more files.
One with the generator, adjusting generator level up and down with 
no modulation, and then modulation (1kHz),  and another with voice 
thru the machine.  In the voice one, I opened up the local receiver 
speaker, so as to deliberately create an echo, showing what my audio 
delay is set for, and what that would sound like if it were the 
600kHz mix-back trick.

Well, the FTP isn't working now.. 
When I get them up there, the first is hnoise5, and the one with 
voice is hnoise6








 
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