Measuring return loss and tuning antennas for the lowest voltage standing wave ratio (VSWR) can be a difficult and lengthy process. AEA says it is able to offer a line of handheld antenna analysts to simplify this process. AEA offers three commercial Analyst models to choose from: the 30-150 Analyst, the 150-525 Analyst and the CellMate Analyst (806-960 MHz). It says that using any one of the Analysts, by simply entering the desired frequency range on the keypad and connecting the antenna will show the graphic plot of the VSWR vs frequency. The return loss will immediately be indicated. After making a few simple adjustments, results can be viewed on-the-spot, says AEA.
Key feaures of the units are:
Graphic plotting - graphical display of the antenna's VSWR vs frequency plots on the LCD screen over a range of at least 1:1 to 10:1. By sweeping an entire frequency range, a comprehensive picture forms of the antenna matching. A movable cursor allows the user to select any frequency for numeric readout of measurements.
Wide coverage - AEA's 30-150, 150-525 and CellMate (806-960 MHz) Analysts continuously cover their respective frequency ranges.
Self-contained RF source - No transmitter or frequency counter is needed; all Analysts are equipped with their own RF source.
Return loss - Checking return loss is simple. Connect the antenna, turn the Analyst on, and the return loss is displayed in dB next to the plot of the VSWR curve for the connected antenna. The return loss can also be measured in an unterminated length of coax by dividing the result by two for cable loss at a given frequency.
Field strength measurements - the CellMate can verify the output of cellular phones with fixed antennas.
Single frequency measurements - by entering the desired frequency, information needed to maximise the antenna's performance will be shown. The keypad allows the user to select the centre frequency, frequency range, step size and other parameters.
Data storage - up to 15 plots in the nonvolatile memory can be stored for future comparison, or for transferring information to a computer at a later date.
Audible tones - audible tones proportional to the measurement being plotted can be produced - a desirable feature when the user is focusing his attention on his antenna. There is also a mismatch limit alarm. The tones may be switched off.
Computer interface - The optional PlotCon software and interface cable for the Antenna Analysts allow plots to be transferred to a PC-compatible computer for storage, analysing or printing. Plots can also be transferred from the computer back to the Analysts for field comparisons.
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