[time-nuts] Phase modulation question

[Don Latham]

Hi Corby:
See: http://www.mhtl.uwaterloo.ca/old/courses/me3532/js/bessel.html
you can simply calculate what you need...
Don

Bruce Griffiths
> cdelect at juno.com wrote:
>> Hi,
>>
>> I'm making some phase mod index measurements as it relates to Rubidium
>> and Cesium standards.
>>
>> Two questions.
>>
>> 1. Is a Bessel table for sine wave modulated FM used for PM also?
>>
>> 2. Where can I find a Bessel table that has fine resolution, the ones
>> I'm
>> seeing only have large increments of Mod index. (like .25  .5 1.0 1.5
>> 2.0) I need to measure in between these values.
>>
>> Thanks,
>>
>> Corby
>>
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>>
> The only difference between fm and pm is that for fm the carrier phase
> angle is modulated by the integral of the frequency modulation signal
> whereas for PM the modulating signal directly modulates the carrier
> phase angle. Thus the analysis is exactly the same (apart from a 90
> degree phase shift of the phase angle modulation) for both sinusoidal FM
> and sinusoidal PM.
>
> Bruce
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-- 
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Dr. Don Latham AJ7LL
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