All,
This journey started several months ago with the purchase on an 8405a to
measure an antenna. One of the items listed at that time was a
bi-directional coupler. Finally I have found one and am beginning to
experiment. The first readings seem to show that the coupler may be
supplying readings that are out of phase? Direct input to the coupler
terminated in a 50 ohm dummy load produce readings that appear to be 90
degrees out of phase. Is this correct? Is it a coupler design issue? I
am a novice in this area so I am not sure what is normal and what is not.
Is this one of those cases where the 8505 is biased to read 0 phase
angle into a known termination and then read the difference in the
circuit under test?
Thanks in advance - Dan
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