Izbornik Zatvoriti

MFJ-945E custom side plate with mounting holes – 3D printed

Skraćena veza: https://pedja.supurovic.net/veza/9827

I plan to use my MFJ-945E antenna tuner in portable setup but it does not have any mounting hole. It has plastic side plates, so I decided to replace them with custom designed and 3D printed plates with holes and built-in M4 bolts needed for easy fixation in frame. It is snap in replacement for original plastic side plates.

Printed it in black PETG filament and it ended up looking good. Now this device is ready to be mounted in frame for my portable radio-station.

More details: https://www.thingiverse.com/thing:4524293

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CNC Clamp Screw Locking Improvement

Skraćena veza: 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

Skraćena veza: 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

Skraćena veza: 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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