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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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HP E6380-90019 Manuale Utente Pagina 61