TinyPLL
Now here is a page dedicated to TinyPLL, that locks a crystal oscillator to a reference by using just an ATtiny AVR MCU and no PLL-chip. See also the video demo in the end.
RF Ideas and Notes – SM6VFZ
Radio Frequency (and other types of) Electronics
Latest posts
QUCS as AppImage
QUCS, or Quite Universal Circuit Simulator, is a great program for RF simulations. But its main parts were written quite many years ago and use Qt4, which is not supported anymore by most Linux distros. An excellent solution to this… Continue reading →
Building and running WSJT-X in a Docker container
Having had some compatibility problems with the pre-built binaries of the weak signal communications software WSJT-X I wanted to build it from source. But since it has a lot of exotic dependencies and also needs a Fortran compiler, I didn’t… Continue reading →
150 MHz frequency counter with ATtiny817..
..and NO prescaler! With the Core Independent Peripherals and the Event System of a modern AVR MCU like the ATtiny817 it is possible to do a lot with asynchronous signals, i.e. signals that not synchronized to the MCU clock. It… Continue reading →
How to enable I2S on Raspberry Pi..
… by adding a “device tree overlay”: https://github.com/danupp/rbpi-i2s-devicetreeoverlay/
RX/TX-Sequencer with 28V relay driver
This is built with an ATtiny214, doing sequencing in code running on the CPU and step-up voltage regulation with the core independent peripherals, like demonstrated in a previous post here. The power drawn by the relay is monitored and the… Continue reading →
Boost regulator with ATtiny
When Microchip bought Atmel I was afraid that they would discontinue further development of the AVR MCUs and instead only promote their PIC-devices. But it seems this worry was unjustified. New series of ATtinies and ATmegas have been released and… Continue reading →
When to use dB and when to use dBm
Occasionally one can see texts and reports about RF circuits where people mix up the terms dB and dBm.The typical erroneous statement is something like “The power level is 7 dBm lower”. In most, probably all, cases it should instead… Continue reading →
PLL / Frequency synthesis with Programmeable Logic
A common FPGA chip, like the Cyclone-series from Intel (formerly Altera), include PLL-blocks that can be used to generate a high frequency clock, referenced to a crystal oscillator at lower frequency. The high frequency oscillator of the PLL block is… Continue reading →
Update to 10 GHz quadrupler
Built a new quadrupler unit and updated the text from 2009: FET Multiplier for 10-12 GHz