Does anyone know what this is?

[Iain McFadyen]

This topic has got me in a tailspin.

I was sure that AIS1 and AIS2 channels were 161.975 and 162.025,... but
sure enough, I do see several articles listing the freqs as 162.075. Of
course, a simple typo by someone, in a document published on the Web, can
lead to all sorts of fear, uncertainty and doubt (FUD).

The modulation technique for AIS1 and AIS2 means that it is virtually
impossible to detect any audio at all. The WAV file is definitely not any
kind of AIS that I have ever heard before....

Here is the official USCG channel assignment listing...

http://www.navcen.uscg.gov/?pageName=apps18

Iain

Iain



On Tue, Oct 27, 2015 at 3:48 PM, Terry N4TLF <n4tlf at wb4jfi.com> wrote:

> It appears to be an automatic ship identification system:
> http://www.funwithelectronics.com/?id=14
> http://continuouswave.com/ubb/Forum6/HTML/003638.html
> http://manpages.ubuntu.com/manpages/vivid/man1/gnuais.1.html
>
> 73, Terry, N4TLF
>
> *From:* Mark Bulla <markbulla at gmail.com>
> *Sent:* Tuesday, October 27, 2015 3:35 PM
> *To:* AMRAD Mail list <tacos at amrad.org>
> *Subject:* Does anyone know what this is?
>
>
> All -
>
> I've attached a .wav file of a transmission that I'm picking up at work -
> I'm receiving it on 162.075 MHz with my HDSDR setup using the FM demod
> setting.  It sounds digital, and has occasional longer bursts of data.
>
> It's not bothering me, I'm just curious if anyone knows what it is.
>
> Mark
>
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