Re: [Discuss-gnuradio] Success (kinda)

[Rob Judd]

Hi Alan,

If you get a clean sound during low-bandwidth music passages, then all
is correct. The bandwidth is the problem when going into a standard
soundcard. Broadcast FM width is ca. 180kHz and you can't just truncate
it and expect it to sound great.

If it dosen't ever sound clean, you may be locked to a harmonic of the
station.

Rob


Alan Gray wrote:
> 
> Further to my problems with FM reception, I've just been
> looking through the standards for broadcast FM in Australia
> and the US. Most characteristics of the signal are identical,
> but I noted that in the US a 75uS pre-emphasis/ de-emphasis is
> used, whereas in Australia we use a 50uS pre-emphasis/de-emphasis
> 
> I freely admit to know a very minimal amout about FM and how
> it works, so I I was wondering if anyone could tell me what
> effect this would have on my reception, and also what I have
> to change in the code to adapt it to the Australian method
> 
> Sorry for hitting everyone with so many messages
> 
> Alan
> 
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