Here in central South Carolina, KPH was S9 all afternoon on 17016.8 kc. The receiver (IC7610) has a built-in recorder, which served the same purpose as Jim’s iPhone! My backup plan was a web SDR on th

FWIW, I recently measured the output of a Hilltopper in order to calibrate a QRP SWR bridge. Power supply VDC P-P RF voltage (50-ohm resistive load) 9 36 12 42 13.8 46 -Lloyd (wa4efs)

The marking on your attached image looks like 10J, which would be 10 pF, 5%, not .01 μF.

Thanks Steve. Surely one of the benefits of kit building—besides learning about toroid winding—must be in the ideas they suggest for other projects. At least that has been so in my experience. Good lu

Nice photo. Do you have a write-up somewhere? 73, -Lloyd (WA4EFS)

The Hilltopper 20’s J5 connects to the MPU’s Tx, Rx, and reset pins. You can connect to J5 from an UNO board’s DIO 0, 1, ground and reset or alternatively using a USB-FTDI cable, but you do need the r

Thank you Jim N5IB and Jim Sheldon.. Inspired by your examples I returned to the struggle and finally figured out how to do a parameterized coil form in FreeCAD. Whew! The point about the CPU demand o

Hello Jim. Very nice work on the coil form. I test printed your .stl file and it came out perfectly. If you don't mind my asking which CAD application do you use? Some time ago I attempted a similar p

The schematic for the 4SQRP Freq Mite kit solved a puzzle for me, namely how to boost a small Hi-Z input voltage to a robust 5 volts in order to drive a counter or etc., without loading the source. St

Hilarious! And the filament voltage won't kill you.

Another similar suggestion. Amazon sells what they call a multifunction tester (range $10 - $15). These amazing devices display the schematic symbol of the part as well as its value. If you test a mol

Very nice indeed. If you don't mind my asking, where did you get the plate transformer? -Lloyd (WA4EFS)

I have also read the book. It is very good.

Some time ago I posted an illustrated story about my personal introduction to 3D printing at https://lloydm.net/Demos/threeD.html. As to where to put the printer in a house that has no room.. How abou

Beautiful! Which CAD software do you use/prefer? 73, -Lloyd (WA4EFS)

Just so everyone knows, if a messages starts with “Dearest, …” it’s not from me! J Lloyd (WA4EFS)

Thanks to all who have described experiences with 3D printing (and wishes)—lot’s to think about but not an easy decision! 73, -Lloyd (WA4EFS) …

To those who have used a 3D printer to fabricate panels or other accessories – Please share your experience, including printer make/model, ease of use, quality of output, etc. Thank you, -Lloyd (WA4EF

Take comfort in having been spotted by K7 and VE6 (http://www.reversebeacon.net/index.php). 73, -Lloyd