A fantastic source of signals information and training.
Check out:
http://sparks-31.blogspot.com/
Free downloads of his Grid Down Communication book, as well as training classes and a wealth of other good information.
From the link:
These classes are a combination of the beginner and intermediate courses.
The class will revolve around the basics of low power/qrp/covert operation with low-profile/improvised antennas, and communications monitoring focused for VHF/UHF COMINT. It is strongly advised that the attendee have at least a general class ham license, as HF operation will be involved. If you don’t have a general license, you can do a COMINT/monitoring track on the Sunday FTX.
Topics to be discussed will include:
Work and life have slowed down some of my efforts for Volume two. It is still underway. I will have some time in the next month to hopefully finish the writing, and start on illustrations. Unfortunately, I won’t be able to do photos until December, so looks like 1Q 2016 before it will be out.
Supplement B contains practice COMSEC materials suitable for teaching, and training.
Included are 480 one time pads, and 140 DRYAD authentication sheets.
More info here:
The first supplement had been produced.
Supplement A includes only the blank forms from Volume One.
With no page numbers showing, it makes a quick pdf to print forms from.