----- Original Message -----
> From: Robert Nickels <ranickel@comcast.net>
> To: osmocom-sdr@lists.osmocom.org
> Cc:
> Sent: Sunday, March 17, 2013 12:32 PM
> Subject: Re: Broadcast FM subcarrier decoding?
>
> On 3/17/2013 9:48 AM, Alan Corey wrote:
>> I can see what look like they might be subcarriers on either side of the
> main signal.  Anyone decoded those?
>
> Hi Alan,
>
> Depending on where you live, there could be several subcarriers present.  From
> your description I'm pretty sure you're referring to Sub Carrier
> Authorization (SCA) which has been mainly used for background music and an audio
> book reading service for the blind as well as other voice and  data services. 
> SCA uses 67 or 92 KHz subcarriers which can be seen on the composite FM signal. 
> If you have a soundcard with sufficient bandwidth  you can send the output of
> SDR# (in NBFM, 150 KHz mode) to another instance of SDR# *(sound card, DSB
> mode)  using Virtual Audio Cable.    My soundcard won't go high enough but
> here's a set of screen images from a system that can, where the various
> elements on the upper side of the FM channel center are annotated:
> http://img208.imageshack.us/img208/5922/fmspectrum.png
>
> The RDS (Radio Data System) or RDBS in the US digital data channel is easily
> seen at 57 KHz,  The level of all these subcarriers is much lower than the
> stereo pilot so you'll need a strong signal for decoding.
>
> 73, Bob W9RAN
>