I am trying to measure the width of an S band pulse. The circirt
consist of a transmitter wave guide and the dummy load with two
identical directional couplers mounted abot 4 ft apart. The pulse
width measured at the DC closest to the transmitter is measured at
1.05uS Measure ment is made through the 20 db port on the coupler a 20
db pad, doide detector good from .1MHz to 12Ghz. 100Mhz scope
calibrated in the last week.. Same results with another scope.

the other point of measurement uses the same type DC, connection to
the 20db port then a 3db splitter then 20 db pad then the detector and
pulsewidth measure .96uS. VSWR is 1.17
Other port on the 3db splitter has a 30 db pad

What could account for the difference in pulsewidths at the two ports.

Jimmie