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Coupling Test
Specification
Description
Figure 12
Equipment
Accuracy of coupling; mean coupling within 0.5 dB of 20 dB (each
secondary arm).
Maximum coupling variation; ± 1 dB (50-ohm terminations).
Refer to
Figure 12
for test setup and for test equipment.
Coupling will be tested using a leveled power source with a barretter on a
swept-frequency basis. A barretter is used because of the frequency range
and its wider square-law range.
Coupling Test Setup
•
Sweep oscillator
•
Low-pass filter
•
Directional coupler
•
Crystal detector (2)
•
Termination (2)
•
Low SWR termination
•
Attenuator
•
Barretter
•
SWR meter
•
X-Y recorder
Performance Tests
775D Operating and Service Manual 21
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