CRF-A Series
BI-DIRECTIONAL COUPLERS
5 to 1500 MHz / 4-Port / Multi-Octave / Minimal Size and Weight / Hi-Rel Hermetic Flatpack
PRINCIPAL SPECIFICATIONS
Model
Number
CRF-10A-250
CRF- 20A-250
CRF-11A-1000
CRF-20A-1000
Frequency
Range,
MHz
5 - 500
5 - 500
100 - 1500
100 - 1500
Performance
Bandwidth,
MHz
5 - 500
5 - 500
10 - 400
100 - 1500
500 - 1000
100 - 1500
500 - 1000
¤ Coupling
Value,
dB, Nom.
10
±1.0
20
±1.0
20
±1.0
11
±1.0
11
±1.0
20
±1.0
20
±1.0
Frequency
Sensitivity,
dB, Max.
±
0.5
±
0.75
±
0.5
±
0.5
±
0.5
±
0.5
±
0.5
Directivity, *Insertion
dB,
Loss, dB,
Min.
Max.
20
18
20
18
20
18
20
1.3
1.0
0.6
1.5
1.2
1.5
1.2
VSWR,
Max.
1.5:1
1.5:1
1.3:1
1.7:1
1.5:1
1.7:1
1.5:1
¤ Coupling is Referenced to the Input
* Insertion Loss excludes Coupling Loss
Outline of A-Size Package
GENERAL SPECIFICATIONS
Impedance:
CW Input:
Weight, nominal:
Operating Temperature:
50
Ω
nom.
1 W max.
0.1 oz (2.8 g)
-- 55° to +85°C
OPTIONAL SPECIFICATIONS
Coupling Values:
Frequency Bands:
NOTES:
1. Tolerance on 3 place decimals
±
.010(.25) except as noted.
2. Dimensions in inches over millimeters.
3. Dimensions marked with * apply only at body.
4. All unmarked pins are case ground.
5 to 30 dB
up to 2.5 GHz
see CBF series
Close tolerance Coupling:
±
0.5 dB
Three Port Equivalents:
General Notes:
1. Merrimac directional couplers are available in a variety of packages to suit most applications. The CRF-A series utilizes the standard
flatpack which is suitable for aerospace applications where size, weight and reliability are important considerations.
2. Applications of directional couplers include monitoring of incident and reflected power,signal sampling for control loops and test signal
injection devices in BITE. These Bi-Directional Couplers have both coupled ports available but they may be ordered with one coupled
port terminated internally as in the CBF series of directional couplers.
3. Merrimac Couplers may be ordered with coupling values up to 30 dB covering selected frequency bands up to 65 GHz.
4. These units comply with MIL-C-15370 and can be supplied screened for compliance with additional specifications you specify for
military and aerospace applications requiring higher reliability.
25Mar96
For further information contact
MERRIMAC / 41 Fairfield Pl., West Caldwell, NJ, 07006 / 973-575-1300 / FAX 973-575-0531
MERRIMAC [ MERRIMAC INDUSTRIES, INC. ]
