AR DC7490 Instructions page 15

The Model DC7490 is a dual directional coupler with excellent frequency range and power handling
capability. The wide range assures flexibility in coupling medium power amplifiers to oscilloscopes, voltmeters,
power meters, spectrum analyzers and other measuring instruments. The dual directional design allows the
user to monitor both forward and reflected power, a much needed characteristic in RF susceptibility testing for
amplifier overdrive protection, field control and load protection. Low insertion loss allows efficient coupling to
the load. The DC7490 is intended for use with the 4000TP8G12, 8300TP8G12 and other T series microwave
TWT amplifiers.
FREQUENCY RANGE ............................................ 8–12 GHz
POWER (maximum) .............................................. 3kW CW, 208kW peak
COUPLING FACTOR ............................................ See Model Configurations
COUPLING FLATNESS .......................................... ± 1.5 dB
DIRECTIVITY
Typical ........................................................... 40 dB
Minimum ....................................................... 35 dB
INSERTION LOSS ................................................ 0.14 dB maximum
VSWR (Main Line) ................................................. 1.1:1 maximum
CONNECTORS
Main Line ....................................................... WR90
Coupled ........................................................ N(F)
WEIGHT ............................................................... 0.45 kg (1.0 lbs)
SIZE (WxHxD) ....................................................... 2.54 x 8.43 x 33 cm (1.0 x 3.32 x 13 in)
Approved for public release by AR RF/Microwave Instrumentation
160 School House Road Souderton, PA 18964-9990 • 215-723-8181 • www.arworld.us
SPECIFICATIONS
Model Configurations
Model Coupling Factor
DC7490 40 dB  2.0 dB (includes flatness)
DC7490M1 60 dB  2.0 dB (includes flatness)
Model DC7490, M1
Dual Directional Coupler
3000 Watts CW
8GHz–12GHz
050114
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