Custom Search

More than 10,000 searchable pages indexed.

Greetings: There is so much good stuff on RF Cafe that there is no way to list or link to all of it here. Please use the Search box or the Site Map to find what you want - there is a good chance I have it. Thanks!

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<
Job Board
About RF Cafe™
Copyright 1999-2015

Tech Smorgasbord Archives -  17

These items are an archive of past Topical Smorgasbord items that have appeared on the RF Cafe homepage. In keeping with the "cafe" genre, these tidbits of information are truly a smorgasbord of topics. They all pertain to topics that are related to the general engineering and science theme of RF Cafe.

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 29 | 30 | 31 | 32 | 33 | 34 | 35 |

Please send me an e-mail if you have a good subject.

(source: IEEE Spectrum)

RF Cafe: Nipper, the RCA DogNipper was a stray fox terrier mix that gained a spot in electronics history as the symbol of RCA. Nipper was chosen as a model for Francis Barraud's painting entitled "His Master's Voice" (which was originally titled, "Dog Looking at and Listening to a Phonograph"). In fact, Nipper would sit at the horn of Barraud's Edison cylinder phonograph with his head cocked, just like in the painting. Nipper appeared on every RCA Victor record label from 1929 until 1969. A few years ago, Melanie bought a Victrola music box, which I figured needed its own RF Cafe: Nipper the RCA dogNipper to be complete. Here is what we came up with.



Oil Loss in New Cars
(source: Popular Mechanics)

While it has nothing to do with electronics, I ran across a surprising (to me) article regarding oil consumption in new cars. Industry-wide specs claim that 1 quart per 600 to 1,000 miles is the norm. That accounts for blow-by past piston rings, seepage past valve guides, or other means. Catalytic converters prevent the old tell-tale bellowing of blue smoke due to oil burning, so in newer cars it is not as apparent. The topic came up when the owner of a 2007 Toyota Solara complained that his engine was going through a quart every 2,000 miles. My 2007 Chevy Cobalt (2.2L, 34 mpg) loses almost no oil between 3,000-mile changes. Here is a similar statement on oil consumption.


Males Are Evil - Again
(source: Science News)

Evidently, higher education is a bad thing if your are male. Last year we learned that terrorists are likely to be male electrical engineers - compliments of Oxford U. Now, another esteemed academic study group has determined that men who attend college are more likely to commit property crimes during their college years than their non-college-attending peers. This brilliant piece of research is slated to be presented at the annual meeting of the American Sociological Association.

Perhaps the most significant finding of note is that highly educated social behavior researchers possess a greater than normal propensity to produce studies which find that educated men have a greater than normal propensity for crime.



Good Cents
Weight Standards

(source: U.S. Mint, Euro)

U.S. coinage is manufactured to very precise standards, and, even allowing for wear, make very good weight/mass standards when you need to calibrate scales to within about ±1.5%. Here are the official weights. Per scientific methods, three decimal places of precision for U.S. coins implies an accuracy of at least ±5e-4 g (±5e-3 g for Euro coins), but that does not jive with Mint's claim.

Penny* 2.500 g
Nickel 5.000 g
Dime 2.268 g
Quarter 5.670 g
50 € cent 7.80 g
10 € cent 4.10 g
5 € cent 3.92 g
1 € cent 2.27 g

Official weights for other country's coins could not be located

* A penny is 0.750" (¾") Ø.


Princeton 2009
College Survey

(source: The Princeton Review)

Students from 368 colleges of all types were polled for opinions of various aspects of the school. Here are some of the result for engineering colleges. Check yours.

Good Professors

#2 Franklin Olin Coll. of Eng.
#8 Harvey Mudd College

Students Study Most

#1 Mass. Inst. of Tech.
#2 Franklin Olin Coll of Eng.
#3 Calif. Inst. of Tech.
#5 Harvey Mudd College
#7 Harvard
#14 U.S. Coast Guard Acad.
#17 West Point (USMA)
#20 Princeton

Bad Professors

#1 Stevens Inst. of Tech.
#2 U.S. Merchant Marine Acad.
#3 Calif. Inst. of Tech.
#6 Johns Hopkins
#9 Rensselaer Poly. Inst.

Students Study Least

#1 Univ. of Florida
#2 Univ. of Maryland
#3 Univ. of Georgia
#9 Auburn


RF Cafe Breaks the PageRank 5 Barrier!

Ever since Google's emergence as the Web's 800-pound search engine gorilla, achieving a high PageRank value (0-10) has been a cause célèbre. Here is the  base equation, ascertained through a combination of published data and reverse engineering:

 RF Cafe: Google PageRank equation   PR(p_i) = \frac{1-d}{N} + d \sum_{p_j \in M(p_i)} \frac{PR (p_j)}{L(p_j)}
A major component is the ratio of inbound links vs. outbound links. For a site like RF Cafe, where I link to many other sources, it is a real battle to get the ratio to even reach parity. After many years of lingering at PR5, RF Cafe finally has achieved PR6 status! Thanks to all who have linked in and who visit regularly.


Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger… single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website