K6JCA

I discussed my experiences getting my ARR-15/R-105A receiver on the air in a previous blog posting ( here ). As I mentioned in that posting...

[ Note, 10 July 12 : Another schematic error fixed:  The 1uF paralleled with the 25K pot should be between the cathode of the 6DE7 (pin 8)...

There's a lot of surplus equipment out there that can be used as the basis for a homebrew project. Here's a way to make it look mor...

Hmmm...I had an old HP 5233L nixie tube counter with 6 nixie tube digits gathering dust in the corner. What to do with it...? Let's see...

[ Note (10 July 12):  The schematic shown below has an error in it.   The 1uF cap paralleled with the 25K pot added to the circuit should co...

[ Update (4 January 2010): Additional info on modifying the R-105A to improve selectivity can be found in my new blog posting here .] I pi...