# Looking for PM demodulator

**URL:** <https://www.ruby-forum.com/t/looking-for-pm-demodulator/229800>\
**Category:** GNU Radio\
**Created:** [January 28, 2013, 2:45pm UTC](https://www.ruby-forum.com/t/looking-for-pm-demodulator/229800 "2013-01-28T14:45:12Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![adream](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/53a042/32.png) [@adream](https://www.ruby-forum.com/u/adream)\
**Post date:** [January 28, 2013, 2:45pm UTC](https://www.ruby-forum.com/t/looking-for-pm-demodulator/229800/1 "2013-01-28T14:45:12Z")

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Hello,  
I am learning the technology of PM demodulation, so I want to read the  
PM  
demodulator’s souce code, but I don’t know how to find these file in the  
gunradio’s source code.  
can anyone tell me which files do these work?  
thank you

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**Author:** ![adream](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/53a042/32.png) [@adream](https://www.ruby-forum.com/u/adream)\
**Post date:** [January 28, 2013, 4:07pm UTC](https://www.ruby-forum.com/t/looking-for-pm-demodulator/229800/2 "2013-01-28T16:07:37Z")

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On 28 Jan 2013 08:44, adream wrote:

> Hello,  
> I am learning the  
> technology of PM demodulation, so I want to read the PM demodulator’s  
> souce code, but I don’t know how to find these file in the gunradio’s  
> source code.  
> can anyone tell me which files do these work?  
> thank  
> you

The quadrature demod block should demodulate PM.

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<div class="post-metadata">

**Author:** ![adream](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/53a042/32.png) [@adream](https://www.ruby-forum.com/u/adream)\
**Post date:** [January 29, 2013, 6:19pm UTC](https://www.ruby-forum.com/t/looking-for-pm-demodulator/229800/3 "2013-01-29T18:19:50Z")

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On 01/28/2013 07:08 PM, adream wrote:

> Thank you for your reply  
> There are two quadrature demodulator int gnuraio,  
> gr\_quadrature\_demod\_cf and gr::anlog:quadrature\_demod\_cf, so which one  
> can be used to demodulate PM signals  
> Thank you very much.

I believe they’re the same. The gr::analog:quadrature\_demod\_cf is part  
of the newer naming scheme that is emerging.

–  
Marcus L.  
Principal Investigator  
Shirleys Bay Radio Astronomy Consortium

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<div class="post-metadata">

**Author:** ![adream](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/53a042/32.png) [@adream](https://www.ruby-forum.com/u/adream)\
**Post date:** [January 29, 2013, 8:08pm UTC](https://www.ruby-forum.com/t/looking-for-pm-demodulator/229800/4 "2013-01-29T20:08:38Z")

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On Mon, Jan 28, 2013 at 4:16 PM, Marcus D. Leech [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> I believe they’re the same. The gr::analog:quadrature\_demod\_cf is part of  
> the newer naming scheme that is emerging.

If you use the one corresponding to gr::analog::quadrature\_demod\_cf,  
then  
your code won’t need to change when release 3.7 becomes official.

Johnathan