RF Cafe Software
About RF Cafe
1996 - 2022
BSEE - KB3UON
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 ...
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March 1948 Radio-Craft[Table of Contents]
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Radio-Craft was published from 1929 through 1953. All copyrights are hereby acknowledged. See all articles from Radio-Craft.
Significant advances in electronics - and all other kinds of technology for that matter - occurred during World War II, which in conjunction with the U.S. government selling surplus equipment at the end of that war at very low prices, cause a boom in consumer electronics markets. The established radio business and the fledgling television markets were abetted by quickly expanding numbers of broadcast stations. This chart from early 1948 show the number of currently licensed AM, FM, and TV stations, with projections out 20 years to 1968. I don't have the data from 1968, but almost certainly the numbers were much larger than predicted, fueled largely by portable radios in automobiles and hand-carried models. Transistorized circuits (the transistor was invented in 1947, just a month before this chart was made) with their smaller size, smaller battery requirements, more rugged construction, improved circuit designs, and higher reliability provided another major kick to the market in the early-mid 1960s.
This chart shows the new high to which the number of U.S. AM, FM and television stations has risen. Besides those shown there are over 30,000 radio-equipped police cars and an ever-growing number of mobile installations in taxis, trucks and other privately-owned vehicles. Educational stations are also at an all-time high, with 32 AM and 38 FM licenses.
U.S. Radio Stations Jan. 15, 1948
Posted April 19, 2017