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BIRD 4391A - Page 45

BIRD 4391A
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Maintenance
32
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.

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