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

Скраћена веза: 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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Fast hand writing for receiving Morse code

Скраћена веза: https://pedja.supurovic.net/veza/9817

Receiving Morse code is a challenge. It is achievable and there are operators that reached stunning skills of receiving Morse Code in very high speeds. One of the limitations is hand writing speed, thus most high skilled operators receive Morse Code „in head“. But sometimes you do have to write it down, right?

First helping technique that should and is learned along with learning Morse Code itself is optimal hand writing. This cuts number of strokes for each character which speeds up writing. Also it is important where strokes end to minimize movement between written characters.

This image shows one of the ways to optimize hand writing. […]
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Радио-аматери од РАТЕЛ-а добијају претње извршитељима

Скраћена веза: https://pedja.supurovic.net/veza/9797

У другој половини 2019. године радио-аматери су од РАТЕЛ-а добили обавештење да је РАТЕЛ донео одлуку да промени износ накнаде за коришћење радио-фреквенција за радио-аматере. Износ је са дотадашњих 10 динара подигнут на 1000 динара. Да,  добро сте прочитали – увећање од само 100 пута!

Овим су радио-аматери добили изузетну захвалницу за сав свој рад на техничком образовању младих и све своје хумане активности у ванредним ситуацијама.

Нарочито је интересантно да је РАТЕЛ обавестио да је ову промену увео реторактивно за 2018. годину.

Обавештење је садржавало позив радио-аматерима да се изјасне да ли се слажу са овом одлуком а нису га ни добили сви радио-аматери. […]
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Fixing Baofeng UV-B5 broken battery latch using 3D printer

Скраћена веза: https://pedja.supurovic.net/veza/9740

I’ve got UV-B5 years ago. It survived lots of use and still served fine. There was one glitch – in some moment latch that keeps battery locked was broken. Radio was still usable but it happens from time to time that battery slips out of socket and radio silently turns off. It was quite annoying but hardly fixable issue.

Until today.

As I recently got myself 3D printer (Prusa I3 MK3S) I get to an idea to model and print replacement part. As every experienced computer expert, I first looked if someone else already did that. And indeed, Thingverse member Olex had the same issue and already did modeling. […]
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Universal CAT and programming USB to serial TTL interface for ham radio

Скраћена веза: 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

Скраћена веза: 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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