Bird Technologies AT-500-Manual - Manual (Page 67)

Maintenance
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magnitude is subtracted from the magnitude of the
measurement signal. For relatively small interferers
(i.e. interfering signal smaller than the measurement
signal), this technique yields approximately 10 dB bet-
ter rejection. If the interfering signal becomes larger
than the measurement signal, the correction output
approaches zero, corresponding to a perfect match.
Measurement results are not accurate under these cir-
cumstances. The remedy is to disable the interfering
source, if possible, or postpone the measurement to a
time when the interfering source is not operating.