Note to spammers

Guys, please don’t waste your time posting spam’ish comments about viagra, dodgy money deals and communist political campaigns – they will never appear on this site as each and every comment is moderated and requires my personal approval. 🙂  

New domain

I have added a new domain to my web server host, this is more inline with the function of this website. Thew new address is: however all the old links from should still work and will be redirected.

IF Derived AGC Module

Some progress for the end of a Bank Holiday weekend – ran out of parts, BF245 FET was probably not the best choice when I have a stack of MPF102 devices, unfortunately the pinout is not compatible with the PCB track layout 🙁 Beer time!  

AD831 Mixer

I bought a pair of AD831 pre-assembled modules from China,  $10 each – not bad considering the price of the individual AD831 chip, the board comes ready to use “plug and play” with all ports terminated in to 50 ohms with SMA connectors – neat. Testing the mixer saw excellent results and the added bonus… Read More »

Receiver Mixer and Filter module

Having re-evaluated the receiver mixer and filter stages I have re-designed the front-end to accommodate the first and second mixers with both the roofing filter and SSB filter daughter PCB’s on one single module, this allowed easy assembly and modular testing of the filter stages. Each filter PCB has the impedance matching networks along with… Read More »