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In order to 3d print a little amplified speaker box to use for #HamRadio SSB 2-operator POTA with my wife, I want to model components and then model the box to go around them.

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  • mcdanlj@social.makerforums.infoundefined

    In order to 3d print a little amplified speaker box to use for SSB 2-operator POTA with my wife, I want to model components and then model the box to go around them. I found a speaker on grabcad that is only a few mm different from the speaker I found in my bin. Just different enough that I need to start over to create a good basis for my box model. I didn't bother constraining everything perfectly when modeling the steps in the metal shell, and I didn't model the cone accurately because those really don't matter that much. It's good enough to check for interference.

    I have barrel and XT60 power connectors already modeled from my last project to choose from here, but I need to add models for the 3.5" phono jacks and the TDA2050 amplifier board I bought from Amazon. Trying to decide whether to use that completely as-is or desolder the potentiometer for the volume control and use wires to re-route it to a more convenient place. A model might help answer that question.

    Not quite unless you give me about 22 hours of grace. 😀

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In order to 3d print a little amplified speaker box to use for #HamRadio SSB 2-operator POTA with my wife, I want to model components and then model the box to go around them.

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    mcdanlj@social.makerforums.infoundefined
    The prototype worked well enough that I'll proceed on to another iteration. Leaning it out with two legs held up by the radial wire worked well, and the little knobs on the top of the spool to hold the wire in place work fine. I'll made them a touch larger to be more robust, but the concept works.I want to be able to fit 12m of wire on the spool, because I want radials that work well as flat radials on 40m, which might take up to 28%λ instead of the nominal ¼λ which would be appropriate in the "discone" setup with 45° radials. However, with this wire, 8m barely fits on this spool. So I need to add a generous allowance for more wire.I need a handle for the hub at the bottom so that I can wind it up with the legs removed. It's unwieldy with two 6' long fiberglass stakes.According to DJØIP, 1 elevated, tuned radial is roughly equivalent to 8 ground radials. Two of these should give me the performance of 16 ground radials. According to his table, I can expect 3.76dB gain over my usual 4 radials on the ground, or even more if I'm using a shortened antenna.With these just leaning, if someone inadvertently walks into my bright pink wire, they'll probably just knock over the leaning posts, which is unlikely to cause a big problem. I'll probably use bullet connectors for the other end of the wire so that they can pop out and not knock the antenna over.
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    It's #FreeCADFriday again!

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    One of my favourite features of the #fediverse is seeing people *learning things*.

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