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Dip oscillators 527 To measure inductance, connect the 100-pF capacitor in series with the unknown coil across the unknown terminals of the dip meter When the null frequency is found, find the inductance from L= where L is the inductance, in microhenries F is the frequency, in megahertz Connect the test inductor across the unknown terminals in series with the unknown capacitance Set the resistance control to zero, tune the receiver to 2 MHz, and readjust the reactance control for null Without readjusting the noise bridge control, connect the test inductor in series with the unknown capacitance and retune the receiver for a null Capacitance can now be calculated from: C= where: C is in picofarads F is in megahertz 5389 F2 [2710] 253 F2 [279]
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One of the most common instruments for determining the resonant frequency of an antenna is the so-called dip oscillator or dip meter Originally called the grid dip meter, the basis for this instrument is the fact that its output energy can be absorbed by a nearby resonant circuit (or antenna, which is an electrically resonant LC tank circuit) When the inductor of the dip oscillator (see Fig 27-9) is brought into
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27-9 Dip meter
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528 Measurements and adjustment techniques close proximity to a resonant tank circuit, and the oscillator is operating on the resonant frequency, then a small amount of energy is transferred This energy loss shows up on the meter pointer as a slight dipping action The dip is extremely sharp, and is easily missed if the meter frequency dial is tuned too rapidly Antennas are resonant circuits, and can be treated in a manner similar to LC tank circuits Figure 27-10A shows one way to couple the dip oscillator to a vertical antenna radiator The inductor of the dipper is brought into close proximity to the base of the radiator Figure 27-10B shows the means for coupling the dip oscillator
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Dip meter 27-10A Direct coupling the dip meter to antenna
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Mount
Dip meter coil
2 3 turn loop Coax to antenna 2 3 turn loop
27-10B Coupling the dip meter to coaxial cable
For antennas with coax connector at feedpoint
Selecting and using RF wattmeters and antenna VSWR meters 529 to systems where the radiator is not easily accessed (as when the antenna is still erected) We connect a small two- or three-turn loop to the transmitter end of the transmission line, and then bring the inductor of the dipper close to it A better way is to connect the loop directly to the antenna feedpoint There are two problems with dip meters that must be recognized in order to best use the instrument First, the dip is very sharp It is easy to tune past the dip and not even see it To make matters worse, it is normal for the meter reading to drop off gradually from one end of the tuning range to the other But if you tune very slowly, then you will notice a very sharp dip when the resonant point is reached The second problem is the dial calibration The dial gradations of inexpensive dip meters are too close together and are often erroneous It is better to monitor the output of the dip oscillator on a receiver and depend upon the calibration of the receiver for data
Selecting and using RF wattmeters and antenna VSWR meters
A key instrument required in checking the performance of, or troubleshooting, radio transmitters is the RF power meter (or wattmeter ) These instruments measure the output power of the transmitter, and display the result in watts, or some related unit Closely related to RF wattmeters is the antenna VSWR meter This instrument also examines the output of the transmitter and gives a relative indication of output power It can be calibrated to display the dimensionless units of voltage standing wave ratio Many modern instruments, a couple of which will be covered as examples in this chapter, combine both RF power and VSWR measurement capabilities
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