Author Archives: Bert

LF converter, tuner and antenna

A few years ago at Dayton I was visiting the FAR Circuits tent and ran across a little circuit by Larry Coyle, K1QW, for converting the LF and VLF band to 4 MHz. This was done to allow users to … Continue reading

Posted in antenna construction, LF, lowfer, VLF | 1 Comment

SW-40 completed and on the air!

It’s a great feeling. My thus far relatively modest journey into homebrewing had another high water point as I finally completed this QRP transceiver, and even better, made my first QSO with it out camping in the woods! The antenna … Continue reading

Posted in antenna construction, Camping, first light, first QSO, KD1JV digital display, SW-40 | Leave a comment

I’m Baaack! Dusting off the station. And, the SW-40 is on the air!

I am back to the blog after an almost 1 year hiatus from all forms of ham radio! It’s good to be melting solder once more. Really, really good! During my down time, I have seen hits to my blog … Continue reading

Posted in Uncategorized | 2 Comments

Crystal filter analysis, SW40

I’ve been away from the blog for quite awhile, mainly because I ran into several roadblocks which stymied my progress with the SW40 build and analysis. I really wanted to re-visit the type of analysis I did when I built … Continue reading

Posted in crystal characterization, crystal filter, SW-40, TAPR VNA, Wes Hayward | Leave a comment

More op-amp fun; 6m opening

I’ve been playing with the op-amp circuits some more.  While the Radio Shack 741 chip more or less worked as advertised, and I was able to amplify audio out of my iPhone (although slightly distorted, for whatever reason), the NE5532 … Continue reading

Posted in 6 m, op-amp, SW-40 | Leave a comment

The 741 chip and op-amps

I decided I wanted a little bit more information about op-amps.  Just soldering in the audio amp into the SW40 kit board and moving on with only vague recollections from 20+ years ago about what these chips do wasn’t satisfying … Continue reading

Posted in LM741, op-amp | Leave a comment

The solder has melted! SW40 begun

It’s been almost a year before any real projects have been undertaken.  Finally, I dug out the SW-40 board about 2 weeks ago and began to play. To refresh, this is a kit I bought back in the early 2000s … Continue reading

Posted in Pacific Antenna, SW-40 | Leave a comment