Alan Yates Laboratory – vk2zay

Alan Yates Laboratory – vk2zay

“I was born in the late 1970s, mid-year in the local hospital of a coastal part of Australia? Yet another instance of humanity, one of the 6.6 billion or so of us (4.2 billion back then). Doomed like all of us to live out their days on this rock with some clinging gases orbiting a minor star in a relatively quiet part of the local cosmic clump of matter.”

Interface on Twitter – @vk2zay

Reflection-pair optical tachometer

Alan Yates Laboratory - vk2zay

Alan Yates

Engineering Calculators

One Transistor Voice Transceiver – Building a toy VHF phone transceiver for 3 metres using only one transistor for both TX and RX!

MK484 MW Receiver – A fairly small MK484 based receiver for the AM broadcast band.

40 Metre Spectrum Analyzer – My go at making a JF1OZL-style spectrum analyser for 40 metres.

Nano-Henry Inductance Meter – My implementation of Drew Diamond VK3XU’s “Nano-L”, plus how I constructed and trimmed my calibration inductances.

TK5EP – Antennas and Measuring Devices

TK5EP – Antennas and Measuring Devices

TS850’s heaven Almost everyhting you wanted to know about the TS850. Schematics, mods, repair informations, and much more.

A remote interface compatible with the original IF232 with opto-electronic isolation is also described.

Gain chart – Made with help of F5BU’s software GALVA, this small chart will help you to calculate SWR, gain, loss, RL return loss within a few seconds.

Lars Petersen OZ1BXM QRP Denmark

Amateur radio homepage by Lars Petersen of Holstebro, Denmark. The Useful Articles include some good rules for the QRPer and Main HF rig and antenna.

Lars Petersen OZ1BXM QRP Denmark

CW, QRP, and satellites. Satellite radios and PIC experiments like the one below

The K3 testboard for 16F873

 K3 testboard for 16F873

The main components are: A 7805 bolted to a small heatsink, a blue reset button, a red LED, a serial I2C EEPROM (24LC256), four DIL switches, the 16F873 with 4 MHz crystal oscillator, a real time clock (DS1302) with lithium battery backup and a MAX232 for serial communication. I’m using an external power supply which is able to provide 12V DC at 300 mA.

Ham radio blog by OZ1BXM

SSPA for 2 meters – 1 kW module


The core of the SSPA is the 1 kW amplifier module. The module is built around the LDMOS transistor MRFE6VP61K25H from Freescale. This device can operate between 1.8 MHz and 600 MHz and delivers 1250 W output. In this application, the output is limited to 1000W.