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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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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Universal CAT and programming USB to serial TTL interface for ham radio

Skraćena veza: https://pedja.supurovic.net/veza/9536

Some years ago I posted article describing Universal CAT and programming USB to RS232 TTL interface for ham radio that I made.

Here is small update, adapter for YAESU FT-8900, FT-8800 and alike radios.

FT-8900 and FT-8800 and some other Yaesu radios use two wire interface. One wire is ground and other is both RX and TX. This is also known as CIV-I interface used in Icom radios.

CIV-I interface is quite simple. There is a diode (universal like 1N14148) connecting RX and TX, oriented cathode toward TX, with one 10K pull up resistor to 5V on RX. […]
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Vectronics PM-30 SWR/Power Meter User Manual and Schematics

Skraćena veza: https://pedja.supurovic.net/veza/9510

I’ve got second hand Vectronics PM-30 SWR/Power Meter and found out very little information about it on Internet. I’ve prepared Manual and Schematics from paper documentation I got with it.

If someone needs it, here is download: Vectronics PM 30 pwr swr meter manual and schematics

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Vežbajte otpremanje Morzeove telegrafije samo sa ručicom i računarom

Skraćena veza: https://pedja.supurovic.net/veza/9225

Za usavršavanje tehnike otpremanja Morzeove telegrafije potrebno je odvojiti dosta vremena za vežbanje. Zgodno je ako to možete da radite kad god imate vremena.

Za to su vam potrebni ručni taster ili ručica i tonski generator. Taster i ručica se nabave (svaki radio-amater valjda to već ima) a kao tonski generator se obično koristi radio-stanica ili, ko se bavi elektronikom, može i da napravi.

Međutim, ako imate računar, on može takođe da završi posao. Postoji nekoliko programa koji rade kao tonski generatori a taster i ručicu na računar povezujete preko serijskog priključka na računaru.

MorseKeyer je jedan od takvih programa. […]
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Spiderpole 12m anchoring construction

Skraćena veza: https://pedja.supurovic.net/veza/8741

Spiderpole 12m made by Spiderbeam is very useful for portable ham radio activities. To do the job it must be properly anchored. This pole may be anchored at the bottom (at about height of the first element) which allows it to withstand wind speed of abut 80 km/h, and at 7 meters high using guying lines (as recommended by manufacturer) which allows surviving windows of 120 km/h.

Anchoring at the bottom seems not suitable for portable, as it requires either to have already set strong short pole (fence or something) to attach pole, or dig one into the ground. […]
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