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496 Mobile, emergency, portable, and marine antennas to the electrical system of the boat when creating external grounds to prevent electrolytic corrosion from inadvertent current flows On sailboats the whip antenna (especially VHF-FM) might be mast-mounted as shown in Fig 25-11 The same grounding scheme applies with the addition of a metal keel or metal foil over a nonmetallic keel The whips used for boat radios tend to be longer than land mobile antennas for the same frequency The VHF-FM whip (Fig 25-12) can be several quarter-wavelengths and take advantage of gain characteristics thereby obtained Whips for the HF bands tend to be 10 to 30 ft in length, and often look like trolling rods on power boats You will also see Citizens Band radios on board boats, and the CB antennas are also whips It is not a good idea to rely solely on CB for boat communications, because it is a lot less
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25-12 VHF-FM boat antenna
Courtesy of Antenna Specialist Company
likely to be useful in emergencies Also, some boaters use amateur radio sets, often illegally, for emergency communications in lieu of a proper HF-SSB unit Longwire antennas also find use in marine service Figure 25-13 shows two installations The antenna in Fig 25-13A shows a wire stretched between the stern and bow by way of the mast The antenna is end-fed from an antenna tuner or line flattener The longwire shown in Fig 25-13B is similar in concept, but runs from the bottom to the top of the mast Again, a tuner is needed to match the antenna to the radio transmission line Notice that the antennas used in this manner are actually not longwires in the truly rigorous sense of the term, but rather random length antennas The format of the tuner can be any of several designs, shown in Fig 25-14 The reversed L-section coupler shown in Fig 25-14A is used when the antenna radiator element is less than a quarter-wavelength Similarly, when the antenna is greater than a quarter-wavelength, the circuit of Fig 25-14B is the tuner of choice This circuit is a modified L-section coupler that uses two variable capacitors and the inductor
498 Mobile, emergency, portable, and marine antennas
25-13A Sailboat HF antenna
Radio Tuner
Mast
Wire
25-13B Mast antenna
Tuner
Radio
Marine radio antennas 499
C1 C2
25-14 Antenna tuners for broad HF antennas
L2 L1 28 H
Finally, we see in Fig 25-14C the coupler used on many radios for randomlength antennas Two variable inductors are used; L1 is used to resonate the antenna, and L2 is used to match the impedance looking back to the transmitter to the system impedance In some designs, the inductors are not actually variable, but rather use switch-selected taps on the coils The correct coil taps are selected when the operator selects a channel This approach is less frequently encountered today, when frequency synthesizers give the owner a selection of channels to use In those cases, either the antenna must be tuned every time the frequency is changed, or an automatic (or motor-driven) preselected tuner is used
500 Mobile, emergency, portable, and marine antennas The line flattener (Fig 25-15) is a standard transmatch antenna tuner that flattens coaxial-cable transmission line for VSWR This type of tuner is especially useful for transmitters with solid-state finals that are not happy with high VSWR Some of those designs incorporate shutdown circuits that reduce (and then cut off) power as the VSWR increases The line flattener basically tunes out the VSWR at the transmitter It does nothing to tune the antenna, but only makes the transmitter operable
C1 250 pF Xcvr C2 250 pF Antenna
L1 33 H
25-15 Line flattener tuner
CHAPTER
Antennas for lowfrequency operation
LOW-FREQUENCY OPERATION (EG, 160- AND 75/80-METER BAND) POSES CERTAIN
difficulties for the antenna Of course, the first thing that springs to mind is the large size of those antennas A half-wavelength dipole is between 117 and 133 ft long on 75/80 m, and on 160 m it is about twice that length On my own suburban lot, I cannot erect a half-wave 75/80-m band antenna and stay within the property lines A similar situation is seen with vertical antennas Although a 40-m vertical (33 ft high) is not an unreasonable mechanical job, the 66 ft 75/80-m vertical (never mind the 120-ft 160-m vertical) is a nightmare In addition, the local authorities might not require any special inspections or permits (check!) on the 33-ft antenna, yet impose rigid and very exacting requirements on the higher structure On suburban or urban lots, a typical 40-m antenna might well be able to fall over and still not cross the property line or come in close proximity to power lines A longer antenna, however, almost inevitably suffers one or the other problem when it falls
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