Antenna Analyzer AIM4170 page 16
Distance to Fault --
Measure the distance to a cable open or short. This can also be
used to measure the ¼ wave length frequency of tuning stubs.
Refer to Antenna --
The impedance readings are transformed to be equivalent to
readings directly at the antenna terminals. Select either Method A
or Method B from the drop-down menu. Click OFF to exit from
the “refer to antenna” mode.
Constant Freq --
Output a constant frequency that can be used as a test signal.
Initial frequency accuracy is +/-30ppm. At 1MHz, the output
amplitude into 50 ohms is about 25 to 30mv-rms (-18 dBm) and
somewhat less at higher frequencies.
Measure Crystal --
Measure the parameters of a quartz crystal automatically.
Details are in a later section.
¼ Wave Stub --
Adjust a coax line to be 1/4 wavelength at a given frequency. The
target frequency and the initial length (in feet) of the coax are
entered in the dialog box. Then the graph runs in recycle mode
and displays the amount of the line that needs to be cut off
("Excess Length") to reach the target frequency. A vertical red
line on the graph highlights the target frequency. The magenta
colored phase plot crosses the horizontal axis at the quarter wave
frequency.
CALIBRATE:
Analyzer--
Calibrate the AIM4170 using open circuit, short circuit and
resistive load conditions. The calibration data is saved in a disk
file that’s read each time the program is started.
Cable --
Data for the cable is generated to be used by the “ref to antenna”
mode when reference Method A is selected.
SETUP:
Plot Parameters --
Select the parameters that are plotted during a scan. The optional
parameters are: SWR or reflection coefficient, Return Loss,
Impedance Magnitude, Series Load Circuit or Parallel Load
Circuit, Theta (phase angle).
Enter Zo --
Enter the nominal impedance of the transmission line. This is
used to calculate the SWR. This is a real number, there is no
imaginary part.
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