[BC] More mono on FM...

[Burt I. Weiner]

Yes, they turned of the Pilot, a test function.  They didn't turn the 
generator to mono.

Burt


At 07:57 AM 1/17/2006, you wrote:
>Subject: [BC] Running mono on FM...
>To: "Broadcast List" <broadcast at radiolists.net>
>Message-ID: <018a01c61b6d$ceea61d0$6b65e242 at Insp1000>
>Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>         reply-type=original
>
>Burt Weiner:
> >> One L.A. station was leaving the  L-R on and only feeding mono
> >>  to the left channel.  The L-R channel was  gobbling up modulation.
>Andy Green:
> > the major downside to broadcating in Stereo is the increased
> > signal to noise ratio that comes with demodulating the L-r
> > info - since the noise level increases with frequency in FM the
> > penalty is quite high.
>___________________
>
>Presumably in Burt's example, the station also turned off its stereo pilot.
>Otherwise stereo receivers would have output on the left channel only in
>that mode.
>
>A stereo FM receiver should kill its L-R demod if no pilot is present.  In
>that case it would not suffer the stereo FM "S/N hit" -- just whatever
>results from reducing L+R modulation at the tx to permit legal, total
>modulation while L+R and L-R (but no pilot) are transmitted.
>
>RF

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at earthlink.net
K6OQK