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Power Leveling
The 778D has cyclic coupling variations of up to ±2 dB. For this reason it is not recommended for
power leveling that requires flatness exceeding these tolerances. A typical coupling curve is shown
in
Figure 2-1
Maintenance
The directional coupler should need very little maintenance besides keeping it clean and protecting
the connector faces.
Keysight 778D Operating and Service Manual
on
page
17.
Operation
4
25
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