[BC] Scope for Mod Monitor...

[Jerry Mathis]

On 7/19/06, Bill Croghan <loteng at lvradio.com> wrote:
>
>        The day I met Dane Erickson 25+ years ago, he was still working for
> the FCC and started out handing me a polaroid of an oscilloscope showing
> my
> station over modulating.  Heck of a note to end my first week there.  He
> showed me how they modulated an FM generator, watching for the nulls on a
> spectrum analyzer that showed the proper modulation index for the defined
> 100% modulation and observing the demodulated signal on an o-scpe.  They
> then calibrated the vertical on the O-scope to that point, and started
> watching the stations modulation.  The over modulation was obvious.  I
> learned a lot that day!  I still use that system to check my own
> modulation
> monitors.
>
> Bill
>
> Bill Croghan CPBE WB?KSW
> Chief Engineer,
> KOMP/KXPT/KENO/KBAD
> Lotus Broadcasting
> Las Vegas, NV
> Email to loteng (at) lvradio.com
> Phone 702-315-3030
> Fax      702-876-6685
>
>
> I, and I bet others, would be interested to learn how you check FM
> modulation with an oscilloscope.
> --
> JM
> _______________________________________________
>


So you have to START with a Spectrum Analyzer, or a calibrated demodulator.
That's nice, if you have them.
-- 
JM