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Collinear Franklin array antenna 165
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6-19 Double extended Zepp antenna
Typical lengths are 207 ft on the 10-m band, 28 ft on the 15-m band, 42 ft on the 20-m band, and 84 ft on the 40-m band The double extended Zepp antenna can be fed directly with 450- twin lead, especially if a balanced antenna tuner is available at the receiver Alternatively, it can be fed from a quarter-wavelength matching section (made of 450- twin lead, or equivalent open air parallel line), as shown, and a balun if coax is preferred The length of the matching section should be L2feet = 103 FMHz [627]
The double extended Zepp will work on several different bands For example, a 20-m-band double extended Zepp will work as a Zepp on the design band, a dipole on frequencies below the design band, and as a four-lobed cloverleaf antenna on frequencies above the design band
Collinear Franklin array antenna
Perhaps the cheapest approach to very serious antenna gain is the collinear Franklin array shown in Fig 6-20 This antenna pushes the dipole and double extended Zepp concepts even farther It consists of a half-wavelength dipole that is center-fed with a 4:1 balun and 75- coaxial cable At each end of the dipole, there is a quarter-wavelength phase reversal stub that end-feeds another half-wavelength element Each element is a half-wavelength ( /2) long, and its length can be calculated from 492 = 2 FMHz [628]
The phase reversal stubs are a quarter-wavelength long, or one half the length calculated by Eq 628
166 High-frequency dipole and other doublet antennas
2 4:1 BALUN
Rope
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6-20 Wire collinear antenna
The version of the Collinear shown in Fig 6-20 has a gain of about 3 dB There is no theoretical reason why you can t extend the design indefinitely, but there is a practical limit set by how much wire can be held by your supports, and how much real estate you own A 45-dB version can be built by adding another half-wavelength section at each end, with an intervening quarter-wavelength phase reversal stub in between each new section, and the preceding section Once you get longer than five half-wavelengths, which provides the 45-dB gain, the physical size becomes a bit of a bother for most folks
The TCFTFD dipole
The tilted, center-fed, terminated, folded dipole (TCFTFD, also called the T2FD or TTFD) is an answer to both the noise pickup and length problems that sometimes affect other antennas For example, a random-length wire, even with antenna tuner, will pick up considerable amounts of noise A dipole for 40 m is 66 ft long This antenna was first described publicly in 1949 by Navy Captain C L Countryman, although the US Navy tested it for a long period in California during World War II The TCFTFD can offer claimed gains of 4 to 6 dB over a dipole, depending on the frequency and design, although 1 to 3 dB is probably closer to the mark in practice, and less than 1 dB will be obtained at some frequencies within its range (especially where the resistor has to absorb a substantial portion of the RF power) The main attraction of the TCFTFD is not its gain, but rather its broad bandedness In addition, the TCFTFD can also be used at higher frequencies than its design frequency Some sources claim that the TCFTFD can be used over a 5 or 6:1 frequency range, although my own observations are that 4:1 is more likely Nonetheless, a 40-m antenna will work over a range of 7000 to 25,000 kHz, with at least some decent performance up into the 11-m Citizen s Band (27,000 kHz) The basic TCFTFD (Fig 6-21) resembles a folded dipole in that it has two parallel conductors of length L, spaced a distance W apart, and shorted together at the
The TCFTFD dipole 167
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