Messages

1

HF Mystery Signals / Re: Mystery Data Burst?

« on: January 02, 2017, 2134 UTC »

Thanks for your reply.  I should have been more clear; the audio
is a simulation of the sound, not a recording of the sound itself.
It appears at what seem to be completely random times.
I've gone weeks without hearing it at all.
But one thing:  When a ham frequency is "frisky" like 14313
used to be or 7200 now, or when the Mexican drug runners are
talking between 6.5 and 7.1 MC, I hear it much more often.
I will try to leave a laptop recording audio and try to catch a
"real" instance, but that will take some time.  Been a long mystery.

Thanks,
Dave S.

2

HF Mystery Signals / Mystery Data Burst?

« on: December 31, 2016, 1955 UTC »

Hello, all.  I've heard this "mystery" signal around HF for years. 
I wonder if anyone knows what it is?
It sounds like this:
http://home.netcom.com/~arc5/pulses.wav
Here it a lot around the ham bands, especially around "certain" freqs.
Some have speculated that it's HF-DF stations sending data burst
to each other to calibrate for band conditions and increase accuracy.
Anyone have a real idea?

TNX OM ES 73 DE Dave AB5S