CNC Clamp Screw Locking Improvement

Скраћена веза: https://pedja.supurovic.net/veza/9634

With hobby mini CNC machines you get simple and very cheap clamps that are not easy to use.

It is hard to fasten it because screw turns along with nut, and as screw head is in T-slot of bead it is not easy reachable to block turning.

This is small rectangle peace you can attach to screw head that will block it turning within T-slot.

It makes using clamps much better experience.

You may make it from mdf, wood, plastic, metal, whatever you like.

Download from: https://www.thingiverse.com/thing:4160827

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Dipole Antenna Center Insulator for SO239

Скраћена веза: https://pedja.supurovic.net/veza/9625

Building dipole antennas is always some kind of improvisation. Center insulator is quite simple and may be made in short time with jigsaw and drill.

As I jumped in CNC world I need some simple tasks to learn how to use FreeCAD and other software. So, dipole center piece is ideal just for that. I’ve finished project and learned a lot in the process.

Finished projects is uploaded to Thingverse: https://www.thingiverse.com/thing:4149187

You may use CNC mill or 3D printer to make this part. Pay attention to use material strong enough to survive possible strong forces.

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Build grid dip meter adapter coil for antenna analyzer

Скраћена веза: https://pedja.supurovic.net/veza/8706

Antenna analyzer like MFJ-259, MFJ-225, MiniVNA and similar may be used as simple grid dip meter for measuring coils, traps and capacitors. All you need is grid dip meter adapter coil which you may buy (costs for MFJ adapter set is about 30 USD) or make it by yourself for few USD.

If you want to build on your own here are dimensions of original coils sold by MFJ.

Small coil for short wave frequencies: coil diameter 15mm, coil length 15mm, 30 turns of 0.5 mm copper wire wound on PVC tube. Coil inductance should be about 3.6μH. […]
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Baofeng LiIon charger modification

My idea was to be able to use this to charge Baofeng radio in various power conditions including in my car and this voltage was a problem. I noticed comments that charger should not be connected to higher voltage than 10 Volts. So I modded charger to fit higher voltage. baofeng-charger-mod