Circuits with flashing LEDs and amazing color combinations are pretty popular. This is probably because they are not only simple but one can literally see the results instantly. Let’s have a look at a microcontroller controlled police strobe light using an ATtiny45 from Atmel. LED flashing circuits have been around for ages and probably always […]
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Working low earth orbit satellites
Working low earth orbit (LEO) satellites is fairly easy and a great exercise for amateur radio operators of all classes. A simple HT for both 2m and 70cm (440 MHz) and a directional antenna is all that is needed for first experiments. There’s an 2m / 70 cm Antenna from Arrow that is highly recommended […]
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BPSK, QPSK, 8PSK and QAM Calculator
A little tool for various calculations revolving around PSK and QAM modulation schemes commonly found in ENG, SNG, and BAS applications. Useful for bandwidth calculations in satellite (VSAT) and terrestrial broadcast applications. The calculator takes factors such as Forward Error Correction (FEC) and roll-off values into account. It’s also extremely useful for amateur radio operators […]
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