In the last blog post, I described the receiver part of my build of the ZL2BMI DSB transceiver and noted that I’d been having problems with the TX transmitting a constant carrier, even with no modulation. Everything seemed to be OK up to and including when I built the driver stage. On adding the BD139-16 […]
A few weeks ago, Jason NT7S mentioned the ZL2BMI DSB transceiver as a rig I might be interested in building. He was right – I had seen it in SPRAT but for some reason hadn’t seriously considered making it into a project. The mention from him somehow got me to take another look at it […]
When 4SQRP brought out a version of the David Cripe NM0S-designed Hi-Per-Mite Filter, I noticed that it could be configured to give up to 50dB of gain. Like many others, I’m sure, my next thought was that it would make the process of building a simple direct conversion receiver even simpler. I decided that at some point, […]
I think I might be closing in on the ideal variable capacitor for a VFO. This arrived in the mail yesterday from an eBay seller: The capacitance swing is 9-50pF with wide gaps between the vanes. Rotation is fairly smooth, though the bearings could use a re-lube. Brass is a good metal for the vanes, […]
I did make some progress on the DSB80 a couple of weeks ago and then put the project aside. I became a bit sidetracked by other things, some of them non-radio, so want to provide an update in case the DSB80 project gets shelved for a while. I received a wonderful e-mail from Frank Ogden […]
Dave Richards AA7EE 