RF Cafe Software

RF Cascade Workbook 2005 - RF Cafe
RF Cascade Workbook

Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel
RF & EE Symbols Word
RF Stencils for Visio

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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There are 1,000s of Pages Indexed on RF Cafe !

Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes RF Cascade Workbook RF Stencils for Visio Shapes for Word Thank you for visiting RF Cafe!

History of U.S. Postage Stamp Prices

Prior to the middle of the 19th century, rates were based on the number of sheets in a letter and the distance it was traveling. In 1845, rates were based on the weight of a letter and the distance it was going. Beginning in 1863, domestic letter rates became "uniform," that is, they were based solely on weight, regardless of distance.


Postage listed below is in cents.

Domestic Letters
Effective Date Per 1/2 ounce  
March 3, 1863 3  
March 3, 1883 2  
  Per ounce  
July 1, 1885 2  
November 3, 1917 3  
July 1, 1919 2  
July 6, 1932 3  
August 1, 1958 4  
January 7, 1963 5  
January 7, 1968 6  
May 16, 1971 8  
March 2, 1974 10  
  First Ounce Each
Additional
Ounce
September 14, 1975 10 9
December 31, 1975 13 11
May 29, 1978 15 13
March 22, 1981 18 17
November 1, 1981 20 17
February 17, 1985 22 17
April 3, 1988 25 20
February 3, 1991 29 23
January 1, 1995 32 23
January 10,1999 33 22
January 5, 2001 34 23
June 30, 2002 37 23
January 8, 2006 39 24
May 14, 2007 41 17
May 12, 2008 42 17
May 11, 2009 44 17
April 17, 2011 44 20
January 22, 2012 45  
 
Table from the U.S. Postal Service