I found some experimental licenses near 15937.5, but not close enough
to be what you are hearing. However, it might pay look at them as maybe
your interpretation as to where they are located is not on the money.
It can be a bit confusing, but the FCC often specifies where the peak
energy is located, not where you would tune your radio. For example, in
sideband, there is no energy at the carrier, but the radio is designed
such that you tune to where the carrier would be if you had one.

If you never searched the FCC, go he
http://svartifoss2.fcc.gov/reports/index.cfm
Use the "frequency" search, and keep it narrow, maybe 1Mhz around where
you think the signal is located. Search both the universal licensing
and the experimental.

Ron Baker, Pluralitas! wrote:
wrote in message
oups.com...
For the feds, the band can be fixed or any mobile except aero. For the
rest, it's fixed.

I found another signal with the same modulation
at 7991.5 kHz. It is transmitting now at 1545 UTC
while there is nothing at 15937.5.

--
rb

wrote:
I did a FCC search, but found nothing. The NTIA allocation just says
fixed. I'll check the redbook.


Ron Baker, Pluralitas! wrote:
It is transmitting right now.

I regularly pick up an unusual data signal
at 15937.5 kHz (USB). It is 7 fsk signals stacked
in frequency. They are 170 Hz shift and there
is 170 Hz between them. The Baud rate is 75.
All seven channels send the same bit stream
but offset in time by as much as 6.66 seconds.
The bits show a flat autocorrelation.
Anybody know what this is/ who is sending
it?

--
rb