Johnson's Techworld

A 16 x 2 LCD display (16 characters, 2 lines) typically has 16 pins. But in the LMR SDR 1.1 circuit four pins (pins 7, 8, 9, 10)

The Berg connector, more commonly known as a Berg Strip or Berg Stick (also known as standard 2.54mm pin headers), is a highly popular connector used with Arduino for prototyping and connecting

All the resistors, capacitors and inductors have been mounted. Five integrated circuits on this side, 7809 regulator IC, 1N4148 diodes, 5V Zener diodes and all the relays have

അമേച്വർ റേഡിയോയിലും മറ്റ് റേഡിയോ കമ്മ്യൂണിക്കേഷൻസിലും വളരെ പ്രധാനപ്പെട്ട ഒരു അളവുകോലാണ് സ്റ്റാൻഡിംഗ് വേവ് റേഷ്യോ (Standing Wave Ratio) അഥവാ SWR. ലളിതമായി പറഞ്ഞാൽ, ഒരു റേഡിയോ ട്രാൻസ്മിറ്ററിൽ നിന്ന് പുറപ്പെടുന്ന ഊർജ്ജം (Power) എത്രത്തോളം കാര്യക്ഷമമായി

You may wonder why I had not posted updates on assembling LMR SDR 1.1 for the past few days. No, I have not skipped the project. I am

My Moxon Yagi for LEO satellite operations was not giving good performance after the recent rains. So thought of bringing it down and having a look. As expected,

There was a good pass of International Space Station in my region today evening with maximum elevation of about 50 degrees and it was a Western pass, which

When I hear the word inductor, I usually think of a coil wound on a former or toroid. But there are also inductors which resemble carbon film resistors

LMR SDR 1.1 is a popular software defined radio design by YE3CIF, being popularized in this region among amateur radio homebrewers by VU3ZOF. For convenience we will discuss

Though I had bought the LMR SDR 1.1 board from VU3ZOF with Si5351 clock generator pre soldered as it was a tiny SMD component, later I found that