AR 10012305, Operating And Service Manual, Page: 15 / 20

Approved for public release by AR RF/Microwave Instrumentation 032713
160 School House Road Souderton, PA 18964-9990 • 215-723-8181 • www.arworld.us Page 1 of 1
Model DC7420, M1
Dual Directional Coupler
50 Watts CW
0.8GHz–18GHz
The Model DC7420 is a wide-band dual directional coupler intended for use with the 10ST1G18, 20ST1G18
and other "T" Series microwave TWT amplifiers. The wide frequency range assures flexibility in coupling high
power amplifiers to power meters, spectrum analyzers, receivers, 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 Model DC7420 is uniquely suited for use with our “ST” series power amplifiers, other amplifiers operating
within this frequency and power range, and our PM2000 Series power meters.
SPECIFICATIONS
FREQUENCY RANGE ............................................ 0.8- 18 GHz
POWER maximum ................................................ 50 watts CW; 300 watts peak
COUPLING FACTOR ............................................ 20

1.3 dB (includes flatness)
COUPLING FLATNESS ..........................................  1.2 dB
DIRECTIVITY ......................................................... 15 dB typical
12
dB minimum
INSERTION LOSS ................................................. 1.6 dB maximum
IMPEDANCE (Main Line) ....................................... 50 ohms, VSWR 1.5:1 maximum
CONNECTORS
Mainline ........................................................ SMA (precision) female
Coupled ........................................................ SMA (precision) female
WEIGHT ............................................................... 0.128 kg (4.5 oz)
SIZE (W x H x D) ................................................... 19.6 x 2.74 x 1.3 cm (7.7 x 1.08 x 0.5 in)
Model Number Connector
DC7420 SMA (precision) female
DC7420M1* SMA (precision) female
*The M1 option includes A2LA calibration.