Radio Propagation Over Plane Earth-Field Strength Curves

Burrows, Charles R.

doi:10.1002/j.1538-7305.1937.tb00754.x

Cited by 41 publications

(4 citation statements)

References 11 publications

(6 reference statements)

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“…The central portion of an experimental receiving antenna assembly minus the antenna rods is shown in figure 5. The input impedance of the resistance-capacitance filter was approximately 10 The effective shunt capacity of the crystal diode was less than 0.75 J.ljJ.f. However, since the resulting reactance of some 2,000 ohms was in quadrature with the radiation resistance of the antenna, the resulting shunting error from this source was a small fraction of 1 percent.…”

Section: Antenna Voltmetermentioning

confidence: 99%

Development of very-high-frequency field-intensity standards

Greene¹,

Solow²

1950

J. RES. NATL. BUR. STAN.

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A description is given of t he development of two very-high-frequency field-intensity standards, which are being used at this Bureau for t he calibration of commercial fieldintensity sets in the range 30 t o 300 megacycles. These standards are employed to establish known values of field intensity by eit her of two methods : (a) the standard-antenna method in which t he open-circuit voltage at the center of a receiving dipole is measured directly ; (b) t he standa rd-field met hod in which the current at the center of a t rans mitting dipole i acc urately known. The techniques u ed for determini ng t he antenna current and voltage are described.The current di stribution on the antenna is determined th eoretically, using Schelkunoff's method, which gives the effective length. These values are compared with t hose obtained by measurement.R es ults of field tests at 100 megacycles are presented in which t he above two m ethods were directly intercompared using horizontal polarization. Their accuracy and limitations aTe discussed.

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Section: Antenna Voltmetermentioning

confidence: 99%

Development of very-high-frequency field-intensity standards

Greene¹,

Solow²

1950

J. RES. NATL. BUR. STAN.

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“…9. The rms value of the electric component of field strength produced by a horizontal transmitting dipole, in its equatorial plane, at distances greater than about 2A over plane homogeneous earth is [26]- [28] (in volts per meter)…”

Section: Z) Generalmentioning

confidence: 99%

NBS field-strength standards and measurements (30 Hz to 1000 MHz)

Greene

1967

Proc. IEEE

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A descriptio0 is given of the CW t"ms@h stamla& and essociptedmepsrwment' ' tationdteceairleeqdforthecnlibmt i o a o f b o t h c o m m e r c i n l d m i l i t u y f i e l d-s t r e o g t h~m v~f r eq w o c y~o f t h e o v~r r n g e~3 0 H z t o l O O O M H z , r r h i e h b s v e~ developedattheNa~WlreraofSt.nQrdsdPriagthepPst25to30yePrs '2be techaiqws are rppliaMe only for evaluating the streegth ofsteady4ate, a c f i e l d s v a r y h g~m t i m e , a n d a r e. o t~f o r p s e~l w o a dband appiicatbm of any kind. Twopri&paltypesofWdrengthstmdar&dapdotypenear-zone 6eId-&engtb meter are described: 1) umgne&&M4rm@b s t d a d s (30 Hz to 30 MHz), 2) e l &-6 e h l e e m g t h st.adnrdf (3 0 to lo00 MHz), and 3) near-zooe electric-fidd-strength meter a d interim kkl-streogth stamhrds (150 kHz to 30 MHz).

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“…Rawls [7]. They are also applicable to the transmission formulas for computing system performance, as proposed by C. R. Burrows [8], H. T. Friis [9,10], and K. A. Norton [ll]. This "separation of the variables" is usually helpful in understanding the respective factors in performance.…”

mentioning

confidence: 99%

Useful radiation from an underground antenna

Wheeler¹

1961

J. RES. NATL. BUR. STAN. SECT. D. RAD. PROP.

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An underground antenna delivers power to the s urrounding conductive medium, and a fraction of the power goes out as radiation above the surface. This fraction is denoted the "radiation efficiency." It is expressed in simple terms for two types of underground antennas. The first and simplest is a vertical loop in a submerged spherical radome. The second is a submerged horizontal ins ulated wire with each end connected to a ground electrode. In each case, the efficiency is the product of three simple factors: The first depending on the index of refraction between air and ground ; the second proportional to the size (radius of the radome or length of the wire) ; the t hird giving t he attenuation with depth. An example for 1 megacycle per second gives a n efficiency of 0.0014 for an underground wire of sp ecified dimensions. The radiation efficiency is applicable to sender or receiver.

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Radio Propagation Over Plane Earth-Field Strength Curves

Cited by 41 publications

References 11 publications

Development of very-high-frequency field-intensity standards

Development of very-high-frequency field-intensity standards

NBS field-strength standards and measurements (30 Hz to 1000 MHz)

Useful radiation from an underground antenna

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