Re: [Discuss-gnuradio] OP25 FSK4 Demodulator Error

[Marcus Müller]

Hi Brandon,

well, I haven't tested OP25 on neither 3.6 nor 3.7, but the changes between the 3.6 and 3.7 class naming and module organization are the nr. 1 cause of OOT regressions; I've only fired up osmocom.org and had a look on the OP25 to-do list, which says "Re-engineering and re-factoring to support GNURadio 3.7 and later."

Using 3.6 and 3.7 parallely works, but you have to make sure you don't mix up things: I'd recommend you install both 3.6 and 3.7 in separate prefixes (you can install 3.7 into a prefix using pybombs, and follow the manual route to install 3.6.5 into another prefix [1]); then you can, by changing a few environment variables, use different versions. Pybombs will even give you a script you can use to modify paths to include your 3.7-prefix, and by changing a few lines in that, you can use a copy to do the same for your 3.6-prefix. Very handy for fiddling around with GNU Radio itself, without breaking everything that was built atop of a working GR installation :)

Greetings,
Marcus
[1] http://gnuradio.org/redmine/projects/gnuradio/wiki/OldFAQ#Experts-only-How-can-I-deliberately-install-GNU-Radio-multiple-times-different-versions

On 02/22/2015 08:16 PM, Brandon Lester wrote:

I'm using 3.7.6. Does 3.6 work? Is there a way that I can have two versions installed concurrently?

On Feb 22, 2015 2:12 PM, "Marcus Müller" <address@hidden> wrote:

Hi Brandon,

which version of GNU Radio are you working with (`gnuradio-config --version`)?
I'm not quite sure, but I think the porting of OP25 to GR 3.7 is still ongoing, so I'm not quite sure it's supposed to work with current GNU Radio at this point.

Greetings,
Marcus

On 02/22/2015 07:07 PM, Brandon Lester wrote:

I'm trying to get my OP25 flowgraph to work. I am having some issues with the FSK4 demodulator and the OP25 Decoder (Combined) blocks. When I run the flowgraph, I get the error "Exception: Could not find a FSK4 demodulator to use". This happens whether I use the combined block, or the FSK4 Demodulator and the simple decoder. I have gr-baz, and gr-op25 installed. In the python shell, I have tried "from gnuradio import fsk4" and I get "cannot import name fsk4". 

I did have to modify the op25.py file to point the import statement to the op25 library as discussed in https://lists.gnu.org/archive/html/discuss-gnuradio/2014-07/msg00293.html

--

Brandon Lester

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