My Articles

Off-blog Articles 2014 to 2017

  Last Updated on Feb 9, 2016


[1] The 30 Degree Gap on Toroids — From Lore to Insight.  Printed in The 5 Watter — The Quarterly Publication of the Michigan QRP Club. Fall Issue for 2014. Web: Mi QRP Club

[2] 3 Ham Band VFO with Adjustable Amplitude Part 1: Mike, WB8ICN and I
Printed in The 5 Watter — The Quarterly Publication of the Michigan QRP Club. Winter Issue for 2015. Web: Mi QRP Club


[3] Funster 40M Band CW Transmitter from 2014  Click here .  A single experiment blogging on the Wordpress vehicle.

[4] Brief notes on DC-DC converters  Click here .   --- Aug 29, 2015

[5] Bob, K3NHI Sweep system   --- Jan 16, 2016
I packaged his schematics, instructions, some of my build notes + photos into one ~ 4.9 MB zip file.
2 links:  Click  or  Click


Thanks to Eugene, AB4UG and Jason NT7S for hosting this file!
 


[6] Experiments with a  LO/2 Digital Quadrature  ---   Feb 9, 2016


Typical digital quadratures involve 2 D-flip-flops that divide the local oscillator by 4.
I tried to make some that pursued a LO/2 scheme -- and found that the divide by 4 format works better to clean up any signal generator duty cycle distortion and gives a wider zero phase error bandwidth in the I and Q channels. Flip flops prove the best amplitude limiter, square wave symmetry device we can find.  I've attached the experiments for interest sake.

2 links:

Click   or   Click  for the 447 Kb sized pdf file

Thanks to Eugene, AB4UG and Jason NT7S for hosting this file!