RF Ideas and Notes – SM6VFZ

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.

QUCS, or Quite Universal Circuit Simulator, is a great program for RF simulations.

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.

..and NO prescaler!

… by adding a “device tree overlay”: https://github.com/danupp/rbpi-i2s-devicetreeoverlay/

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.

When Microchip bought Atmel I was afraid that they would discontinue further development of the AVR MCUs and instead only promote their PIC-devices.

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”.

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.

Built a new quadrupler unit and updated the text from 2009: FET Multiplier for 10-12 GHz