[BC] Other uses for 19 kHz pilot frequency...

[Burt I. Weiner]

I don't believe you can use the 19 kHz pilot frequency for anything 
other than as the pilot.  There is some wording somewhere in the 
Rules that specify the protection that must be made to the 19 kHz 
region.  If you try to FSK shift the pilot I would imagine that you 
would destroy the stereo separation since it is the phase reference 
for the re-insertion of the 38 kHz carrier for the DSSC demodulation process.

Burt

At 08:38 AM 1/18/2006, you wrote:
>From: DHultsman5 at aol.com
>Subject: Re: [BC]  FM Band  other used for 19 kHz.
>To: broadcast at radiolists.net
>Message-ID: <1d5.4c706db0.30ff9599 at aol.com>
>Content-Type: text/plain; charset="US-ASCII"
>
>Ok  Brain trust  I have several questions.    What  can we technically use
>10% of the FM signal at 19 kHz.  for other than  light the stereo light (not
>primary) and phase locking the 38 kHz. DSSB  suppressed carrier?
>
>I have heard several ideas in the past, Frequency shift keying for  data?  By
>adding a time constant to hold the receiver phase while the 19  kHz. is
>shifted + or -.
>
>I have heard discussion of amplititude modulating the 19 kHz. low response
>with no cut off below 2% modulation for telemetry tones.
>
>Since it was such a small amount of bandwidth and % of  modulation.   Think
>about it.   It seems that we are wasting  10% modulation when the receivers
>could be locked with todays  technology.
>
>I doubt that it will ever be changed but  I wonder if you could do  something
>similiar to RBDS on the 19 kHz?
>
>Think out of the box.......Comments and ideas???
>
>Dave
>
>hanging out in Pittsburgh

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at earthlink.net
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