RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its
primary purpose was to provide me with ready access to commonly needed formulas and reference
material while performing my work as an RF system and circuit design engineer. The Internet was
still largely an unknown entity at the time and not much was available in the form of WYSIWYG
All trademarks, copyrights, patents, and other rights of ownership to images and text used on the
RF Cafe website are hereby acknowledged.
articles are scanned and OCRed from old editions of the ARRL's QST magazine. Here is a list
of the QST articles I have already posted. All copyrights are hereby acknowledged.
de Forest, inventor of the Audion vacuum tube, created a business
called De Forest Radio Company (although I hear he didn't build that).
This advertisement for his company's electron tubes appeared in the
December 1931 edition of the ARRL's QST magazine.
If you research
Lee de Forest, you will find his name spelled incorrectly in many different
forms: de Forest, De Forest,
de Forest, to give a few. When in doubt, go straight to the source, which
in this case is the signature that de Forest placed on his patent applications
- he used "de Forest." Note that the official company name, according
to the advertisement address at the bottom, is "De Forest Radio Company,"
(space used) yet the text of the copy uses the form "de Forest" (no space),
and the marking on the base of the tube says, "de Forest." Sometimes
marketing companies screw up, so I went searching for a more reliable
source - the name given on the company's stock certificate. Sure enough,
"de Forest" was the official name.
the ad is a broadcast made by Jean Shepherd from station WOR in New
York in 1968, relating the time when he met Lee de Forest during WWI
when Shepherd was 17 years old. Jean Shepherd, if you don't know, is
the guy who originated the story that is the basis of "A
Christmas Story," one of my favorite Christmas movies.