# NTSC Modulation?

**URL:** <https://www.ruby-forum.com/t/ntsc-modulation/238791>\
**Category:** GNU Radio\
**Created:** [January 29, 2014, 9:49am UTC](https://www.ruby-forum.com/t/ntsc-modulation/238791 "2014-01-29T09:49:26Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [January 29, 2014, 9:49am UTC](https://www.ruby-forum.com/t/ntsc-modulation/238791/1 "2014-01-29T09:49:26Z")

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Googling around and was wondering if anyone has managed to get NTSC  
(Analog  
TV) modulation working in GNURadio. I have ATSC up and going, but would  
like to do some analog stuff too as my old exciter is junk. If not,  
where  
do I start?

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**Author:** ![jowijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e95f7d/32.png) [@jowijo](https://www.ruby-forum.com/u/jowijo)\
**Post date:** [January 29, 2014, 10:46am UTC](https://www.ruby-forum.com/t/ntsc-modulation/238791/2 "2014-01-29T10:46:20Z")

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On 29.01.2014 09:48, Jordan J. wrote:

> Googling around and was wondering if anyone has managed to get NTSC  
> (Analog TV) modulation working in GNURadio. I have ATSC up and going,  
> but would like to do some analog stuff too as my old exciter is junk. If  
> not, where do I start?

Googling around gives me this:  
[http://osdir.com/ml/gnu.radio.general/2005-01/msg00029.html](http://osdir.com/ml/gnu.radio.general/2005-01/msg00029.html)  
Seems that Martin DvH has already done something similar.

Also, where to start depends on where you are now.

- Is your hardware setup fine? I.e. can you get a good NTSC signal into  
your machine?
- How well do you know GNU Radio and signal processing?

In general, I think a gr-ntsc would be interesting. Have a look at the  
tutorials on how to write an OOT-module. If you have more specific  
questions, just come back to this thread.

MB

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**Author:** ![jowijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e95f7d/32.png) [@jowijo](https://www.ruby-forum.com/u/jowijo)\
**Post date:** [April 3, 2014, 2:17am UTC](https://www.ruby-forum.com/t/ntsc-modulation/238791/3 "2014-04-03T02:17:56Z")

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My question pertains to modulation (transmission), not reception. 🙂 I  
have  
yet to find much of anything in the way of examples or a foundation of  
doing this. Kind of surprised this seems to be an uncommon thing.

TL;DR: I would like to modulate an NTSC (analog) TV signal using  
GNURadio.