What’s all this? In 10 seconds, A high performance, 7MHz, 5 watt SSB rig Draws just 24 mA of current 90 dB dynamic range, 80 dB close-in dynamic range 3D printed rock stable, slow tuning PTO with zero backlash. 3D printed toroids You have all the parts in the junk box or you can buy […]| VU2ESE
The sBitx is a homebrewer’s SDR radio with integrated digital modes. Maximum power output of 40 watts on 80M and 40M bands, goes down to 20 watts on 15M and 6 watts on 10M. Based on a Raspberry Pi, a WM8731 codec and ordinary components found in your junkbox Uses a hybrid superhet architecutre for […]| VU2ESE
Here is how you can get started with experimenting with the sBitx software. We will see how the sBITX is laid out and how to quickly start changing things. The latest source code can always be found on https://github.com/afarhan/sbitx. Quick Start If you received the sBitx as a ready-built system, you will find the source […]| VU2ESE
This calculator computes the intercept, noise figure and gain of cascaded stages of an RF circuit. It is based on the calculations set forth in Fig 2.69 of Experimental Methods in RF Design (Hayward, Campbell and Larkin, ARRL) This calculator was developed by Wes Hayward, W7ZOI, the lead author of the above book. He wrote […]| VU2ESE
This is a work in progress. STlinkV2 adapter’s pinout on the plastic case is WRONG. the actual pin details are printed on the PCB. I installed the stlink (the stlink should be added to a special group that allows access to the ‘modem’/’usb’) git clone https://github.com/texane/stlink.git cd stlink/build cmake .. make && sudo make install […]| VU2ESE
A two tone test generator is a very useful, simple circuit that you can build to test your circuits for distortion. What is it The principle is very simple, two crystal oscillators generate two signals that are close to each other. Both the oscillators are well isolated from each others output and then mixed together […]| VU2ESE
Specan – A reboot of the W7ZOI/K7TAU An easy to build spectrum analyzer for the homebrewers Show me what you got! For those who can’t wait to see the circuit diagram, here it is (the Arduino hookup is a little way down on the page): (A better, higher resolution diagram can be downloaded here: […]| VU2ESE
A dual-band transceiver with a crisp receiver and a clean SSB signal is described. It started its life as an investigation of the excellent S7C receiver described in EMRFD. This transceiver was specifically designed to use components that are easily available in TV and Radio spares shops. The receiver sports an above average dynamic range, […]| VU2ESE
JBOT stands for Just a Bunch of Transistors. It is a simple, stable and easy to build 5 watts linear amplifier build out of a bunch of ordinary low power NPN transistors. Why another linear amp? For many of us, getting hold of high power RF transistors is impossible. They are also expensive and easily […]| VU2ESE
Feedback amplifiers are marvelous, reliable circuits. They have gained popularity in the amateur literature thanks to many articles featuring them in the popular magazines like the QST, they have been extensively used in the works of Wes Hayward, W7ZOI.| VU2ESE