[BC] AM Stereo On A Mono Radio-FM Loudness

[Radio Doctor]

On Wed, 03 Oct 2007 19:25:56 +0000, RichardBJohnson at comcast.net said:
> 
> According to the FCC Rules, the FCC is wrong. The FM deviation must
> be measured using a Type Approved modulation monitor --period.
> 
> There are published methods of verifying the monitor's calibration
> using the Bessel-null method. This is done with a steady-state tone.
> The ballistics of the meter and the characteristics of the flasher are
> defined by the rules on type-approval of monitors.
> 
> It doesn't matter if the modulation levels are WRONG! The idea
> is that EVERYBODY must use the same RULES. It's rules-based,
> not physics based.
> 
> That said, if somebody was able to push a new monitoring scheme
> through the FCC, that allowed unfair competition, and it seems as
> though that's what they did, then the FCC is simply wrong (again).
> 
> Note that 75 kHz deviation is purely arbitrary, a RULE. In fact, with
> FM, the deviation has little to do with the bandwidth occupied!
> 
> Somebody, maybe even Armstrong, himself, decided upon a
> deviation that could be handled with conventional receiver
> circuitry. The rest is history. Even the channel-spacing is
> arbitrary! No radio station will sound louder and, therefore
> obtain an unfair competitive edge, as long as the same rules
> are followed by all. That is precisely why there are rules
> about modulation monitors.
> 
> --
> Cheers,
> Richard B. Johnson
> Read about my book
> http://www.LymanSchool.org
> 
> 
>  -------------- Original message ----------------------
> From: "Dana  Puopolo" <dpuopolo at usa.net>
> > Interesting.
> > At the NAB a few years ago, I was shown by the FCC how they measured it there.
> > They took a lab grade FM tuner and connected it to an oscilloscope that was
> > calibrated to the tuner for 100% modulation at their lab. After adjusting the
> > directional antenna to eliminate multipath, they looked at the modulation
> > peaks on the calibrated 'scope. Too many and you got a pink slip. That sure
> > DOESN'T sound like using occupied bandwidth to me!
> > 
> > -D
> > 
> > ------ Original Message ------
> > Received: Wed, 03 Oct 2007 01:46:39 PM EDT
> > From: RADIO DOCTOR <lylehenry at fastmail.fm>
> > To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
> > Subject: RE: [BC] AM Stereo On A Mono Radio-FM Loudness
> > 
> > On Wed, 3 Oct 2007, Dana  Puopolo wrote:
> > 
> > > For the life of me, I still fail to understand why the FCC doesn't use 
> > > occupied bandwidth as opposed to peak deviation to measure broadcast 
> > > FM modulation. Every other radio service does it that way!
> > 
> > A major group was testing FMeXtra this summer and the engineer told me 
> > that they do use occupied bandwidth.  The FCC had been there some time 
> > back and saw how they did it.  No pink ticket.
> > 
> > 
> > ..Lyle, FMeXtra evangelist, in Los Angeles, CA     Cell: 213-880-4690
> > -----------------------------------------------------------------------
> >            Go digital on FM with FMeXtra!  http://fmextra.com
> > Lyle Henry, CPBE  THE RADIO DOCTOR  K9DKW/K7OO  Silver Lake/Los Angeles
> >   SCA Consultant, Contract Engr: Brazil, China, Mexico, Taiwan, SE Asia
> >                          323-660-4690 Office/Home
> > -----------------------------------------------------------------------
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> 
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Lyle Henry, CPBE  THE RADIO DOCTOR  K9DKW/K7OO  Silver Lake/Los Angeles
 SCA Consultant, Contract Engr: Brazil, China, Mexico, Taiwan, SE Asia
                        323-660-4690 Office/Home
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