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

[Dana Puopolo]

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
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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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