An interesting find on Aliexpress: a slightly larger Arduino Nano board with an in-built 0.91″ OLED display, 128×32, I2C. The driver chip is the SSD1306. Three libraries were needed to set it up and test it with a new sketch, but it works OK now. It could come handy for debugging comms or for monitoring…
Gradio sam razne birače antena. Oni se po pravilu sastoje od dva dela – upravljačke i preklopne kutije, koje su povezane upravljačkim kablom. Zadnjih nekoliko godina ustalio se jedan model preklopne kutije, tj. kutije s relejima. Ona je za pet antena i predstavlja kompromis: bilo bi lepo da predviđa više antena, ali je i pet…
This is a Morse keyer by DL4YHF, who designed the circuit and wrote the software 26 years ago. I just designed a new PCB for it. The circuit is practically the same, with only a few minor changes and omissions. I wanted a tiny, low-power device that could be easily adapted for different implementations. When…
The JRL21 Noise Reduction Module removes fan noise much better than expected. (Or perhaps my expectations were too low.) You can listen to two ‘before/after/before‘ audio examples. See links at the end of the article. Prostorija oko radio-uređaja ume biti vrlo bučna, posebno ako su tu veliki pojačavači snage i njihovi ventilatori. Može biti poželjno…
NanoVNA jeste open-source vektorski mrežni analizator – sprava za merenje radnih parametara antena i svega drugog u šta ulaze i kroz šta prolaze signali visokih frekvencija. Minijaturan je i relativno jeftin, dostupan prosečnom radio-amateru koji sam petlja oko antena, filtera, pojačavača. Pomoću NanoVNA može se meriti i analizirati impedansa, odnos stojećih talasa (SWR), meriti frekvencija…
If you follow groups or forums where hams ask for help with equipment issues, you may have noticed that transmitters show a pronounced tendency to fail while they are being used for digital (data) modes. It seems that people often forget that amateur transceivers are not designed to transmit at full power for longer periods…
Lepo radi i veoma mi je koristan prethodni projekt instrumenta koji govori, solidno dorađen:https://yu2zz.com/2020/06/17/instrument-koji-govori-talking-multimeter-v2-0/ Ovo sada jeste tek zanimljiv eksperiment s novim instrumentom i sa SCPI protokolom koji je danas skoro pa univerzalno podržan kod kvalitetnijih mernih instrumenata i drugih laboratorijskih uređaja: osciloskopa, analizatora spektra, izvora napajanja itd. Zavisno od modela, fizički interfejs može biti…
There are countless projects for measuring devices based on Arduino, often using quite basic measurement sensors and circuits. Still, we can improve accuracy with a one-time calibration against a reference device at a few (or more) points, implementing the simplest linear interpolation/mapping/correcting function, just a few lines of code. Please see the first picture. It’s…
ArduinoDroid is an Arduino IDE for Android. The paid version offers some advanced options, but all that really matters to most people is already there in the free version: you can write, open, edit, save, compile and upload programs to Arduino boards, use the Serial Monitor and all the usual options. To connect the phone…