# Branch next - analolg FM modulators do not work?

**URL:** <https://www.ruby-forum.com/t/branch-next-analolg-fm-modulators-do-not-work/227070>\
**Category:** GNU Radio\
**Created:** [March 3, 2013, 9:20am UTC](https://www.ruby-forum.com/t/branch-next-analolg-fm-modulators-do-not-work/227070 "2013-03-03T09:20:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Ralph\_ASSchmid](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/4bbf92/32.png) [@Ralph\_ASSchmid](https://www.ruby-forum.com/u/Ralph_ASSchmid)\
**Post date:** [March 3, 2013, 9:20am UTC](https://www.ruby-forum.com/t/branch-next-analolg-fm-modulators-do-not-work/227070/1 "2013-03-03T09:20:55Z")

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Hi,

with branch “nect” I get an error like this wenn for example a simple  
NBFM or  
WBFM transmitter is built:

howing: “/media/RAS\_SD/Documents/Stereo-TX.grc”

Generating: “/media/RAS\_SD/Documents/top\_block.py”

Executing: “/media/RAS\_SD/Documents/top\_block.py”

Traceback (most recent call last):  
File “/media/RAS\_SD/Documents/top\_block.py”, line 9, in   
from gnuradio import blks2  
File  
“/usr/local/lib/python2.7/dist-packages/gnuradio/blks2/ **init**.py”,  
line 37, in   
exec “from gnuradio.blks2impl.%s import \*” % (f,)  
File “”, line 1, in   
File “/usr/local/lib/python2.7/dist-  
packages/gnuradio/blks2impl/channel\_model.py”, line 26, in   
channel\_model = gr.channel\_model  
AttributeError: ‘module’ object has no attribute ‘channel\_model’

> > > Done

Not a really big problem as still “master” works fine…

Ralph.

---

<div class="post-metadata">

**Author:** ![Ralph\_ASSchmid](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/4bbf92/32.png) [@Ralph\_ASSchmid](https://www.ruby-forum.com/u/Ralph_ASSchmid)\
**Post date:** [March 3, 2013, 5:16pm UTC](https://www.ruby-forum.com/t/branch-next-analolg-fm-modulators-do-not-work/227070/2 "2013-03-03T17:16:31Z")

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On Sun, Mar 3, 2013 at 3:19 AM, Ralph A. Schmid [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> AttributeError: ‘module’ object has no attribute ‘channel\_model’
> 
> > > > Done
> 
> Not a really big problem as still “master” works fine…
> 
> Ralph.

Ralph,

We have discussed and warned about this on the mailing list with our  
move to the 3.7 API. Because we are making core changes to the API and  
in which modules the blocks exist, we know there are going to be  
breakages in the example code. We are waiting until we are done  
transitioning all of the blocks before we make a concerted effort to  
fix all of them. Basically, if we fixed them for every change we made,  
we’d just be repeatedly fixing them. The ‘next’ branch is not  
guaranteed to right now work with all of the effort going in to 3.7.

Tom

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<div class="post-metadata">

**Author:** ![Ralph\_ASSchmid](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/4bbf92/32.png) [@Ralph\_ASSchmid](https://www.ruby-forum.com/u/Ralph_ASSchmid)\
**Post date:** [March 3, 2013, 5:20pm UTC](https://www.ruby-forum.com/t/branch-next-analolg-fm-modulators-do-not-work/227070/3 "2013-03-03T17:20:37Z")

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> Ralph,
> 
> We have discussed and warned about this on the mailing list with our move  
> to the 3.7 API. Because we are making core changes to the API and in which  
> modules the blocks exist, we know there are going to be breakages in the  
> example code. We are waiting until we are done transitioning all of the  
> blocks  
> before we make a concerted effort to fix all of them. Basically, if we  
> fixed  
> them for every change we made, we’d just be repeatedly fixing them. The

OK, fine.

> ‘next’ branch is not guaranteed to right now work with all of the effort  
> going  
> in to 3.7.

I know, no problem 🙂 Just wanted to mention it.

> Tom

Ralph.