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Although the procedures for tuning certain specific antennas might be different from those given below, the basic principles are the same, and can easily be adapted to any given situation There are two situations to consider First is the antenna in which there is either a single adjustable (or tap-selectable) loading coil, or a fixed loading coil and an adjustable shaft resonator Second is the case ( Fig 25-2A) where there is an adjustable or tapped coil in series with a tapped impedance-matching coil at the base Case no 1 In this case, we assume that the antenna has a single adjustment, either a shaft resonator or adjustable coil In this case we need to use a field strength meter (FSM) to measure the relative field strength of the radiated signal The antenna resonator is adjusted until the radiated field strength is maximum Of course, this procedure must be done in steps, keying the transmitter after each adjustment to see what happened Alternatively, a VSWR meter can be used to set the resonator to a minimum VSWR Case no 2 Here, we have a coil at the base that is fixed with respect to the antenna radiator element, but is tapped with respect to the coaxial cable from the transmitter A second coil is also used in the antenna (see Fig 25-2A), which can be either in the center or at the top This coil is adjustable for setting resonance Alternatively, this coil may be fixed, and an adjustable resonator shaft may be used to set operating frequency In this type of antenna the upper coil, or resonator shaft, is adjusted to resonance by using a field strength meter The lower coil is adjusted for minimum VSWR Both adjustments are needed to complete the job
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A field strength meter (FSM) is an instrument that measures the radiated field from an antenna Commercial engineering-grade instruments are calibrated in terms of either watts/square centimeter or volts/meter, and are used for jobs such as broadcast station proof-of-performance tests and other professional jobs For adjusting
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484 Mobile, emergency, portable, and marine antennas antennas, however, a considerably different instrument is sufficient This section describes two simple, passive (which means no dc power is required) field strength meters usable for adjusting HF radio antennas, including both CB and amateur radio antennas Two forms are shown in Fig 25-3; both are basically variations on the old-fashioned crystal set theme Figure 25-3A shows the simplest form of untuned FSM In this circuit a small whip antenna (used for signal pickup) is connected to one end of a grounded RF choke (RFC) The RF voltage developed across the RFC is applied to a germanium diode detector; either IN34 or IN60 can be used Silicon diodes are normally preferred in signal applications, but in this case we need the lower contact potential of germanium diodes in order to improve sensitivity (Vg is 02 to 03 V for Ge and 06 to 07 V for Si) A potentiometer is used both as the load for the diode and as a sensitivity control to set the meter reading to a convenient level The untuned version of the FSM is usable even at low powers, but suffers from a lack of sensitivity Only a certain amount of signal can be developed across the RFC, so this limits the sensitivity Also, the RFC does not make a good impedance match to the detector diode D1 An improvement is possible by adding a tuned circuit and an impedance-matching scheme, as shown in Fig 25-3B In this case a variable capacitor C3 is used as a tune control The tuning capacitor is parallel resonant with inductor L1 A tapped capacitive voltage divider (C1/C2) is used to provide impedance matching to the diode Figure 25-3C gives values of capacitance and inductance for various bands Operation of the tunable FSM is simple and straightforward Set the sensitivity control to approximately half-scale, and then key the transmitter; adjust the tuning control (C3) for maximum deflection of the meter pointer (readjustment of the sensitivity control may be needed) After these adjustments are made, the tunable FSM works just like any other FSM
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