Well oops! Have a problem with an internet link? How can that be?
The PDF file is attached, I tested two links--just to see--and downloaded one document that appears to be genuine. Yes, the website is wavetek.org (NOT .com). I don't see a problem with that.
The source website is chrisgrossman.com and it has the info about Erik. The relationship between Chris and Erik? If is probable that Erik created the database--perhaps as an employee of Wavetek--or simply downloaded it before Wavetek stopped supporting it. Chris is just giving credit to his source, or Chris might have had a larger role in the publication. Who knows?
Datron/Wavetek created a plethora of products, many of superb quality, so yeah: happy hunting in the database.
Wavetek.com is a dead site. Erik Bobbink is very much alive and lives in Paris (France, not TX) and is the "real deal" in the investment business. {as was I in a time long ago}