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Chapter 3 61
Overview of the Test Set’s Built-In Tools
Using RF Tools Program
Estimating Antenna Return Loss
If you are measuring the return loss of an antenna connected to the end
of a known good feed line, you can determine the approximate return
loss of the antenna by subtracting twice the line loss. For example, if
you measure a return loss of 24 dB and the line is known to have 2 dB
loss, the estimated return loss of the antenna is 20 dB (since there is a
total of 4 dB of loss as the signal is sent to the SWR bridge and reflected
back to the Test Set). This estimate is in error if the coaxial line and
connectors do not have a return loss somewhat greater than 24 dB.
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