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R C2 3901 Ht 4:1 balun C1 A1 A2
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(noninductive)
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W 75coaxial cable L B
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ends The feedpoint is the middle of one conductor, where a 4:1 balun coil and 75- coaxial-cable transmission line to the transceiver are used A noninductive, 390- resistor is placed in the center of the other conductor This resistor can be a carbon-composition (or metal-film) resistor, but it must not be a wirewound resistor or any other form that has appreciable inductance The resistor must be able to dissipate about one-third of the applied RF power The TCFTFD can be built from ordinary no14 stranded antenna wire For a TCFTFD antenna covering 40 through 11 m, the spread between the conductors should be 191 2 in, while the length L is 27 ft Note that length L includes one-half of the 19-in spread because it is measured from the center of the antenna element to the center of the end supports The TCFTFD is a sloping antenna, with the lower support being about 6 ft off the ground The height of the upper support depends on the overall length of the antenna For a 40-m design, the height is on the order of 50 ft The parallel wires are kept apart by spreaders At least one commercial TCFTFD antenna uses PVC spreaders, while others use ceramic You can use wooden dowels of between 1-in and 5 8-in diameter; of course, a coating of varnish (or urethane spray) is recommended for weather protection Drill two holes, of a size sufficient to
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168 High-frequency dipole and other doublet antennas pass the wire, that are the dimension W apart (19 in for 40 m) Once the spreaders are in place, take about a foot of spare antenna wire and make jumpers to hold the dowels in place The jumper is wrapped around the antenna wire on either side of the dowel, and then soldered The two end supports can be made of 1 2 in wood treated with varnish or urethane spray The wire is passed through screw eyes fastened to the supports A support rope is passed through two holes on either end of the 1 2 and then tied off at an end insulator The TCFTFD antenna is noticeably quieter than the random-length wire antenna, and somewhat quieter than the half-wavelength dipole When the tilt angle is around 30 , the pattern is close to omnidirectional Although a little harder to build than dipoles, it offers some advantages that ought not to be overlooked These dimensions will suffice when the bottom end frequency is the 40-m band, and it will work well on higher bands
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The vee-sloper antenna is shown in Fig 6-22 It is related to the vee beam (covered in Chap 9), but it is built like a sloper (ie, with the feed end of the antenna high above ground) The supporting mast height should be about half (to three-fourths) of the length of either antenna leg The legs are sloped downward to terminating
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6-22 Vee-sloper antenna
Multiband fan dipole 169 resistors at ground level Each wire should be longer than 1 at the lowest operating frequency The terminating resistors should be on the order of 270 (about one-half of the characteristic impedance of the antenna), with a power rating capable of dissipating one-third of the transmitter power Like other terminating resistors, these should be noninductive (carbon composition or metal film) The advantage of this form of antenna over the vee beam is that it is vertically polarized, and the resistors are close to the earth, so they are easily grounded
Rhombic inverted-vee antenna
A variation on the theme is the vertically polarized rhombic of Fig 6-23 Although sometimes called an inverted vee not to be confused with the dipole variant of the same name this antenna is half a rhombic, with the missing half being mirrored in the ground (similar to a vertical) The angle at the top of the mast ( ) is typically 90 , and 120 to 145 is more common Each leg (A) should be , with the longer lengths being somewhat higher in gain, but harder to install for low frequencies A requirement for this type of antenna is a very good ground connection This is often accomplished by routing an underground wire between the terminating resistor ground and the feedpoint ground
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