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Sense antenna circuit
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Figure 23-8 shows a method for summing together the signals from an RDF antenna (such as a loop) and a sense antenna The two terminals of the loop are connected to the primary of an RF transformer This primary (L1A) is center-tapped and the center tap is grounded The secondary of the transformer (L1B) is resonated by a variable capacitor C1 The dots on the transformer coils indicate the 90 phase points The top of L1B is connected to the sense circuit, and to the receiver antenna input The phasing control is a potentiometer (R1) The value of this pot is usually 10 to 100 k , with 25 k being a commonly seen value Switch S1 is used to take the sense antenna out of the circuit The reason for this switch is that the nulls of the loop or loopstick are typically a lot deeper than the null on the cardioid pattern The null is first located with the switch open When the switch is closed you can tell by the receiver S meter whether or not the correct null was used If not, then reverse the direction of the antenna and try again
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Adcock antennas
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The Adcock antenna has been around since 1919 when it was patented by F Adcock Figure 23-9 shows the basic Adcock RDF array This antenna consists of two centerfed nonresonant (but identical) vertical radiators Each side of each element is at least 01 long, but need not be resonant (which means the antenna can be used
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Watson-Watt Adcock array 447
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23-8 Sense circuit for a loop/sense antenna RDF
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over a wide band) The elements are spaced from 01 to 075 , although the example shown here is spaced 0125 The Adcock antenna is vertically polarized, so it will respond to the vertically polarized wave very much like loop or phased array antennas of similar size The horizontally polarized wave, however, affects all elements the same, so the currents are essentially cancelled, resulting in no pattern This characteristic makes the Adcock antenna suitable for high-frequency shortwave RDFing The pattern for an Adcock antenna is shown in Fig 23-10 This pattern was generated using the NecWin Basic for Windows program (Chap 17) The example antenna is a 10-MHz (30-m band) Adcock that uses 1455-m elements (total 291 m on each side), spaced 4 m apart The pattern is a traditional figure-8 with deep nulls at 0 and 180 The antenna can be rotated to find a null in the same manner as a loop
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Figure 23-11 shows the Watson-Watt Adcock RDF array It consists of two Adcock arrays arranged orthogonally to each other It is common practice to arrange one Adcock in the east-west direction and the other in the north-south direction These are fed to identical receivers that are controlled by a common local oscillator (LO) The outputs of the receivers are balanced, and are used to drive the vertical and horizontal plates of a cathode-ray oscilloscope (CRO) Figure 23-12 shows the patterns achieved by signals of various phases arriving at the Watson-Watt array The patterns of Figs 23-12A and 23-12B are made from signals 180 out of phase, while the signal of Fig 23-12C has a 90 phase difference
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448 Antennas for radio direction finding (RDF)
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23-9 Adcock array RDF antenna
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23-10 Adcock pattern
23-11 Watson-Watt Adcock array
450 Antennas for radio direction finding (RDF)
23-12 Patterns for different signals on the Watson-Watt array
Doppler RDF antennas
Figure 23-13 shows the basic concept of a Doppler RDF antenna The Doppler effect was discovered in the nineteenth century A practical example of the Doppler effect is seen when a wailing ambulance siren is approaching you, and then passes you and heads away from you The wailing pitch will rise as the sound source approaches, and then fall as the sound source recedes in the opposite direction In a radio system, when the antenna and signal source move with respect to each other, a Doppler shift is generated This shift is proportional to the relative speed difference The Doppler RDF antenna of Fig 23-13 uses a rotating antenna The signal approaches from a single direction, so there will be a predictable Doppler shift at any point on the circular path of the antenna The magnitude of the phase shift is R Fc S [231] c
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