Bird Technologies 4391A - Manual (Page 45)

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*. Frequency band and power range is determined by the Plug-in
Elements selected. See Bird Catalog for availability. Some modes
require two elements in a 10:1 power ratio.
†. VSWR and return loss functions settle in less than 1 second.
‡. For CW power levels greater than one-third of full scale, accuracy of
the percent modulation mode is 5% from 0 to 90% and +10% from 90
to 100%. Modulation frequency is 25 to 100,000 Hz; except for “A”
and “B” elements: 25 to 20,000 Hz; and “H” elements: 25-10,000 Hz.
**.For “A” and “B” elements the minimum pulse width is 1.5
microseconds. For “H” elements the minimum pulse width is 15
microseconds.