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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Webmaster:
Kirt Blattenberger,
 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 ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
 AirplanesAndRockets.com

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(Title)(Title)

Tech Smorgasbord Archives - 5

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. Note: There is also a huge collection of my 'Factoids' (aka 'Kirt's Cogitations') that might interest you as well.

| 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 |

Cyber Attacks on Cellphone Batteries

Draining cellphone batteries is a new sport by hackers. By usurping control of communications channels that a cellphone uses for broadband data transfer, an attacker repeatedly awakens a victim phone from its low-power mode. Verification tests were run on a Nokia 6620 phone at UC Davis that were able to reduce a battery's lifetime from 156 hours to a mere 7 hours from a fully-charged state. The process was carried out through two commercial networks without triggering any intruder alarms.

Unemployed Electrical & Electronics Engineers
 EE Times Research 2006

Year Qty. %
2005 6000 1.8
2004 18,000 2.4
2003 24,000 6.3
2002 16,000 3.8
2001 6,000 1.6
2000 6,000 1.4

Planned Retirement Income Sources by Age Group
IEEE-USA Research 2006

Source Ages %
IRA and/or
401(k)
18-34 65
35-49 57
50-64 41
65+ 23
Pension 18-34 29
35-49 37
50-64 37
65+ 38
Stocks
and/or
Mutual Funds
18-34 42
35-49 33
50-64 27
65+ 33
Social
Security
18-34 24
35-49 29
50-64 44
65+ 60

Semiconductor Component Spending by Country
 Microwaves & RF Research 2005

Country $109 %Mkt
U.S. 58.70 33.5
Japan 45.72 26.1
Taiwan 17.34 9.9
Germany 10.21 5.8
China 9.514 5.4
S. Korea 9.233 5.3
Others   14.1

 

September 2005 Internet Statistics
 Scientific American Research 2006

Every Day of the Month:

94 million people use the Internet
77% wrote/read e-mail
63% used search engines
46% read online news
29% did job-related research
18% instant messaged
18% banked online
5% booked travel
3% read blogs
3% participated in an auction

 

2005 EE Salaries U.S., E.U., & India
EE Times Research 2006

Title $US Mean
VP of Engr. 128,079
Tech. Director 119,127
Principal Engr. 109,962
Consultant 95,085
Group Leader 93,514
Sr. Engineer 91,903
Systems Engr. 86,596
Sr. Test Engr. 85,222
Project Engr. 80,124
Software Engr. 74,235
Design Engr. 71,659
Test Engr. 69,649

Perfect 2-Carat Man-Made Diamonds

A perfect man-made, single-crystal, 2-carat diamond.Perfect single-crystal diamonds of more than two carats are churned out in a single day. The gemstones are created using a process called chemical vapor deposition (CVD), which grows diamond crystals one carbon atom at a time. CVD is the same technique used to process many semiconductor circuits.

 

Gallium is a byproduct of smelting aluminum and zinc, and is more rare than gold. It, along with mercury, cesium, and rubidium, are the only metals which can be liquid near room temperature.

Arsenic is a deadly poison that is made by heating composite minerals in the absence of air.

Acting together in compound form, gallium arsenide (GaAs) has been the basis of the personal communications revolution.

Amount of Greenhouse Gases (CO2) Emitted by Household Appliance Use

Item lbs/yr
Heating 6643
Air Conditioning 4566
Hot Water Heater 2384
Refrigerator 2032
Dryer 1770
Dishwasher 840
Computer 430
Microwave 343
Washer 197
Television 196
VCR 90
Ceiling Fan 82
Printer 74
Alarm Clock 74

 
The world is running out of Internet addresses. No worries, however, because Internet Protocol version 6 (IPv6) will solve that problem by providing up to 2128 unique IP addresses. That is the equivalent of roughly 2,000 addresses for every square meter on the Earth's surface. Question: If IPv6 replaces IPv4, what happened to IPv5?