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'''Field strength in free space''' is a term in [[telecommunications]]. It is the [[field strength]] caused by a half wave [[dipole]] under ideal conditions. The actual field strength in terrestrial environments is calculated by empirical formulas based on this field strength.
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== Power density ==
 
 
Let '''N''' be the effective power radiated from an isotropic antenna and '''p''' be the power density at a distance '''d''' from this source<ref>''Reference data for radio Engineers'', Howard W.Sams co,Indianapolis, 1956, 27-7</ref>
 
:<math>\mbox{p} = \frac{N}{4\cdot \pi \cdot d^2}</math>  
 
Power density is also defined in terms of electrical field strength;
 
Let '''E''' be the electrical field and '''R''' be the impedance of the free space
 
:<math>\mbox{p} = \frac{E^2}{R}</math>  
 
The following relation is obtained by equating the two,
 
:<math> \frac{N}{4\cdot \pi \cdot d^2}= \frac{E^2}{R}</math>  
 
or by rearranging the terms
 
:<math> \mbox{E} =\frac{\sqrt{N} \cdot\sqrt{R}}{2\cdot \sqrt{\pi}\cdot d}</math>
 
== Numerical values ==
 
 
Impedance of free space is <math> 120 \cdot \pi</math>
 
Since a half wave dipole is used, its gain over an isotropic antenna (<math>\mbox{2.15 dBi} = 1.64</math> ) should also be taken into consideration,
 
:<math> \mbox{E} =\frac{\sqrt{1.64 \cdot N} \cdot \sqrt{ 120\cdot \pi}}{2\cdot \sqrt{\pi}\cdot d}
 
\approx 7\cdot\frac{ \sqrt{N}}{d}</math>
 
In this equation SI units are used.
 
Expressing the same equation in:
: '''kW''' instead of '''W''' in power,  
:'''km''' instead of '''m''' in distance and  
:'''mV/m''' instead of '''V/m'''
 
is equivalent to multiplying the expression on the right by <math> \sqrt{1000}</math>.<ref> K.H.Kaltbeitzer: ''Site selection'', EBU Techhnical Monograph 3104,Bruxelles,1965, p 30 </ref> In this case,
 
:<math>\mbox{E} \approx 222\cdot\frac{\sqrt{N}}{d} </math>
: </div>
 
== See also ==
 
*[[Antennas]]
*[[Effective radiated power]]
*[[Electric field]]
*[[Field strength meter]]
 
== References and notes ==
<references/>
{{Analogue TV transmitter topics}}
[[Category:Telecommunication theory]]
[[Category:Antennas]]
[[Category:Broadcast engineering]]

Latest revision as of 01:37, 11 November 2014

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Steak Knives ordinarily have 4 to six inch thin serrated blades even so some also have straight edges. Steak Knives are identified on virtually all modern day dining tables for cutting steak into compact manageable bite sized pieces. In contrast to Bread Knives the serrations found on Steak Knives tend to tear meat fibers rather than slicing neatly by way of them. There is an incredibly massive range of cooking knives on the other hand there are only a few that are frequently identified in most kitchens.

Knives made from carbon steel give durability and they do not rust or stain, except for oxidation over the years. Furthermore, it is somewhat quick to sharpen carbon steel knives. Stainless alloy knives by comparison price far significantly less and commonly have a serrated edge mainly because they dull quickly. Scalloped indentations generally are used on bread knives, while serrated knives are used on meat.

The single most important element in determining the excellent of a kitchen knife is not its name brand, its value or no matter if it was stamped or forged. Generic "high-carbon" knives could really feel excellent when they come out of the box, but they're positive to disappoint down the road. If you have any kind of inquiries pertaining to where and the best ways to utilize Wusthof Classic Knives Evaluation, you can call us at our internet site. Applying the suggestions above to a set of distinctive price range tiers yields some real bargains. Cooks Illustrated's recommendation - the Forschner 3-Piece Fibrox set - is a screaming bargain.

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