I've completed assembly of all the Digitrio and RCM Classic construction articles into PDF files. The Digitrio series includes all the followup articles I could find (4-channel and 6-meter options, and all the accessories), and is split into 2 parts the basic 7-article series, and then everything else that followed. RCM Classic is a single file. They're all around 16-18 Mb. I have uploaded them to DropBox, with the following URLs:

Digitrio 1st 7 articles:
https://www.dropbox.com/s/k89ngflnes...series%201.pdf
Digitrio last 16 articles (incl. a couple Ed Thompson columns):
https://www.dropbox.com/s/zwihh2b84l...nhancement.pdf
RCM Classic:
https://www.dropbox.com/s/ypm240434w...%20Classic.pdf

Please note that I've added blank pages where necessary to allow viewing the files 2-up, preserving the way facing pages would have looked in the magazine. Also, the size of RCM was slightly different from 8-1/2" x 11", so I've composed the PDF as A4 (8.26" x 11.69"). It shouldn't make a difference if you print to letter-sized paper.

A hearty thanks to Jean-Pierre Piednoir, an RC Universe contributor, who provided all the material (pre-scanned!) that I lacked to finish this project.

Charles Wahl