Roger G3XBM's (Mainly) Amateur Radio Blog

There is no doubt that direct conversion receivers can be both low cost and effective. This page (linked from Hot Iron 110) has some interes...

This rig was designed and built many years ago. It spanned some impressive distances and worked well. The receiver was a direct conversion ...

Since my days in mobile radio (now nearly 7 years ago) things have moved on.   CML now sell a VHF/UHF direct conversion IC covering 50-940MH...

What I think is quite an old paper turned up in my browsing today: http://www.norcalqrp.org/files/austinnc2030presentation.pdf . In it, Dan...

For some reason when I put multiple images on a post it is not easily possible to see them clearly when clicked (at least with Firefox). S...

Rev B 28MHz WSPR receiver Adding more audio decoupling around the oscillator and adding a common base FET RF preamp has totally fixed th...

I rebuilt my 10m WSPR RX today (the rig has to be called Wispy ) onto a tidier, smaller board using MeSquares and took a few steps to reduce...

There is something strange about my Polyakov mixer based direct conversion receiver for 28.1246MHz WSPR at the moment. On the bench, when ...