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1.4" or 2" throat large constant directivity horns you can actually buy!
1.4" or 2" throat large constant directivity horns you can actually buy!
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Old 29th May 2019, 08:38 PM   #411
gedlee is offline gedlee  United States
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Quote:
Originally Posted by badman View Post
I think it's doable just with lots of effort and impractical for most systems. Even though Geddes style solutions are a little more complex than plug 'n play, adding dipole EQ and all the extra stuff that goes along with a dipole/cardioid solution adds a lot more complexity and equipment.
Having been down this road with paper studies I can tell you that the complexity gets to the point of impractical.
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Old 2nd June 2019, 05:59 AM   #412
mabat is offline mabat  Czech Republic
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I found some more pictures of the "rectangular" profile including cuts around the circumference. I'm willing to release the tool if anyone is interested. I could incorporate a functionality of generating of complete ABEC project with a mesh file so everyone could easily "design and try" their own. Any interest?
Attached Images
File Type: png ATH10-cuts_0-to-diagonal.png (22.7 KB, 578 views)
File Type: png ATH10-cuts_diagonal-to-90.png (32.6 KB, 496 views)
File Type: png ATH10-f.png (127.7 KB, 499 views)
File Type: png ATH10-o.png (122.2 KB, 508 views)
File Type: png ATH10-D.png (152.9 KB, 492 views)
File Type: jpg ATH10-z1.jpg (236.2 KB, 86 views)
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Old 2nd June 2019, 10:02 AM   #413
NiToNi is offline NiToNi  United Kingdom
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Absolutely - that would be awesome, Marcel!

How easy would it be to translate models to CNC or 3D printing?
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Old 3rd June 2019, 07:14 AM   #414
mabat is offline mabat  Czech Republic
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That is something still to be figured out and which I hope someone will show later on. I don't work with any 3D CAD myself and I have no clue what the possibilities are, I only know it can be done. All I'm able to do is to export coordinates of the points in some form. These can be imported to CAD and then splines, surfaces and volumes created. We already tried this with jzagaja and it worked with satisfactory results. I can create directly only triangular meshes and STLs...

Hold on, I'm finishing the tool to be released. I began to use Gmsh API internally so it's really easy to add any mesh for ABEC, including a (rounded) box for the waveguide, etc.
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Last edited by mabat; 3rd June 2019 at 07:23 AM.
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Old 3rd June 2019, 07:37 AM   #415
FredrikC is offline FredrikC  Norway
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Well done mabat! I would really apreciate if you choose to share the ABEC project as I am learning the software myself.

Importing points into CAD and creating a solid model for CNC or 3D printing will not be very difficult.

I have been working with waveguides about 10" in size in ABEC and had to move away from OS to obtain nice polars. Interesting to see your results in this regard.
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Old 3rd June 2019, 07:46 AM   #416
mabat is offline mabat  Czech Republic
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The tool will create complete ABEC project along with the mesh file for the horn you specify by its parameters (including OS). I think you might be surprised how well OS can perform with an appropriate termination. I was.
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Old 3rd June 2019, 07:57 AM   #417
FredrikC is offline FredrikC  Norway
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Sounds great.

I hear what you and Earl say about termination. Also the overall size matters according to Earl, so I guess there will be a significant difference between a 10" and a 18" device.
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Old 3rd June 2019, 08:03 AM   #418
mabat is offline mabat  Czech Republic
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Even with 10" you should be able to get very good results. Of course the beamwidth won't be held nearly as low as with a bigger device - that is the drawback. It depends on what you want to achieve. You'll see.
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Last edited by mabat; 3rd June 2019 at 08:07 AM.
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Old 3rd June 2019, 08:20 PM   #419
mabat is offline mabat  Czech Republic
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I just need to write some short user guide. In the meantime you can try these two sample projects. All you have to do (provided you already have VACS and ABEC3 on your computer) is to load the project file to ABEC and push the two buttons in the toolbar (left first) to see how good it can get.

These are some quick ABEC projects just created by the tool. One OSWG and a rectangular-morphed horn. Calculated are horizontal, vertical and diagonal polars and a radiation impedance, for the start. You can inspect the *.msh files with Gmsh (Gmsh: a three-dimensional finite element mesh generator with
built-in pre- and post-processing facilities
)

Once I have it ready I will start a new thread.
Attached Images
File Type: png abec_run.png (255.5 KB, 105 views)
Attached Files
File Type: zip abec_horns.zip (83.4 KB, 19 views)
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Old 3rd June 2019, 11:06 PM   #420
FredrikC is offline FredrikC  Norway
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Looking forward to your thread mabat. Had a quick look at the round OSWG and it works like a charm.
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