Quick look at the NanoVNA

For a while now there is a very inexpensive Vector Network Analyzer (VNA) called NanoVNA available from various sources. At a price point of less than 50 USD it is very affordable for hobbyists. But is it any good? The Nano VNA covers the frequency range from 50 kHz – 900 MHz, has a small […]
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Arduino |Automatically Save Variables to EEPROM on Power-Down

A recurring challenge for Arduino projects is that variables are volatile and will be lost completely unless previously stored to some sort of non-volatile storage such as de inbuilt EEPROM. This article shows a minimalistic approach to detect sudden loss of power and automatically store a variable to an EEPROM adress. First I should mention […]
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Diamex Prog-S2 | Arduino IDE

The Diamex Prog-S2 is an universal USB ISP programmer vor various microcontrollers including Atmel AVRs. This article shows how to integrate the programmer into the Arduino IDE There are a few articles on the web that talk about the Diamex Prog-S2 and Arduino. But it seemed to me like they were either outdated or faulty. […]
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Automated Forward Gain Measurement

This article is going to take you into the world of automation. Using MATLAB and commercial off-the-shelf bits and pieces, this article will show how to measure the forward gain of a RF device. For a long time now I had a bunch of Mini Circuits portable test equipment bits and pieces sitting around. S […]
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Thermal Design Basics | Practical Example

Thermal design is one of those things engineers don’t really learn in school and hobbyists often don’t even think about. This article is going to show some basic math with a practical example. One of my portable police scanners has an external 6V jack. To use it in my car I used my standard linear […]
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AT&T go Phone Service for GSM Modules

When playing with GSM/GPRS modules for Arduino and other platforms, one is faced with the selection of a cell phone carrier that supports such devices. This article is going to show how to use AT&T’s go phone service for GSM modules. For my SIM900 powered GPRS Shield V2.0 from seed [1] I needed to find […]
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Realtime GPS Tracker w. SD Card Logger Part 2 | Google Maps Link

This article shows how to build a realtime text message GPS tracker with integrated SD card logger. It allows coarse realtime tracking and more precise post analysis through the logged data. Not too long ago I wrote an article featuring a Realtime GPS Tracker w. SD Card Logger. That project sends raw NMEA [1] sentences […]
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Realtime GPS Tracker w. SD Card Logger

This article shows how to build a GPS tracker that sends NMEA GPS sentences to a remote device in realtime. At the same time it logs position information onto a SD card. A while ago I got a bunch of SIM900 GSM shields, the GPRS Shield V2.0 from seed [1]. Looking for project ideas I […]
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Simple Arduino SD-Card GPS/NMEA Datalogger

This article is going to show how to build a minimalistic GPS datalogger. The GPS logger is based on the Arduino platform and stores raw NMEA sentences from pretty much any GPS module to a SD card. For a project I needed to log GPS information. I had various GPS modules and plenty of Arduinos […]
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KF5OBS #56: Generating PWM Signals

In this video I’m showing how to generate a PWM signal that’s behaving proportionally to analog control signal. P.S. Watch out for the Dinosaur!
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