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The First Photo
Kirt's Cogitations™ #33

These original Kirt's Cogitations™ may be reproduced (no more than 5, please) provided proper credit is given to me, Kirt Blattenberger.

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   Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or
                                        reflection; meditation; contemplation.
   Kirt [kert] – proper noun: RF Cafe webmaster.


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The First Photo

Joseph Nicéphore Niépce made the first photograph on record in 1826. He captured a crude image of his south France country estate by coating a pewter plate with an asphalt called bitumen of Judea, which hardened when exposed for along time to the sun's rays. The camera was of the pinhole type, since optics had not yet been applied to cameras. After 8 hours of exposure, the plate was washed with a mixture of oil of lavender and white petroleum, leaving the faint image of his courtyard in relief. Visible in the photo are rooflines of nearby buildings, trees, and the horizon, complete with shadowing.

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

Smith Chart™ for Excel
Smith Chart™ for Visio
RF & EE Symbols Word
RF Stencils for Visio

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