Monthly Archives: May 2014

Directions to take with the hobby

I felt like a non-technical post about technical stuff today. Other than maybe 1 or 2 folks, I think most who read my blogs are finding them via google searches that land on some of my key words (and aren’t … Continue reading

Posted in Uncategorized | 3 Comments

Bitx20 VFO mixer & VFO

  Back to the Bitx. I spent some time doodling and staring at the VFO mixer on paper (see above).  I redrew the trifilars in a way that made more sense to me. I think I got the gist of … Continue reading

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Dry sponge doldrums; chaos on 40m?

The past week has seen zero soldering and zero hamming.  I’m sort of in a transition phase or maybe just in a slight motivational ebb.  The little sponge on the soldering station has been dry for some time. I did … Continue reading

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Crystal analysis and the Bitx20 crystal filter

I thought I’d really delve into crystal filter analysis now.  I’ve been looking at it off and on for the last few weeks but now I’ve decided it would be good to compile some of my learnings for future reference … Continue reading

Posted in bitx20, crystal characterization, crystal filter | 1 Comment

Mrad-40 schematic; cleanup, TAK-40 & projects list

I decided to hand-draw the schematic for my little direct conversion creation.  I’d like to put the schematic on a CAD program and file it away in a nicer fashion but I may never get to it.  This is a … Continue reading

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Second order Butterworth BPF

I decided that the broadcast breakthrough was just too strong to live with for my little direct conversion rig, Mrad-40.  I’d made a band pass filter (BPF) already, but it’s roll-off wasn’t stiff enough to knock down shortwave broadcasts, especially … Continue reading

Posted in band pass filter, Broadcast breakthrough, direct conversion, Mrad-40 | 1 Comment

Fixing some wiring mistakes

  The little Mrad-40 is really blasting audio now — now that I’ve fixed two major wiring errors! The audio now is too loud for headphones and can power a small speaker.  But I’m using the amplified speaker anyway just … Continue reading

Posted in Broadcast breakthrough, direct conversion, Mrad-40 | Leave a comment