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RF Cascade Workbook 2005 - RF Cafe
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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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Sound Level Chart

Sound powers for the following equation in dBA units are referenced to a picowatt (10-12 W).

Sound Power Formula - RF Cafe


Where: W1, W2 = sound power in similar units of watts

The threshold of pain for the human ear is usually taken to be around 120 dBA.




The following table presents examples of some common noise sources.

Location Min Max
(dBA)
Inside Home 25 45
Inside Office 35 50
Inside Airplane Cabin 75 85
Inside Factory 65 100
Talking @ 3 ft 55 65
Shouting @ 3 ft 75 85
Clothes Dryer @ 3 ft 55 65
Vacuum @ 3 ft 65 80
Chain Saw @ 3 ft 100 120
Clothes Washer @ 3 ft 55 75
Car @ 25 ft @ 65 mph 70 80
Airplane @ 1000 ft 95 110
Traffic @ 300 ft 40 60
Rural Ambient 25 35