INTERNET
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Distribution Centers NORTH AMERICA 800-654-7949 417-335-5935 Fax 417-335-5945 EUROPE 44-1252-832600 Fax 44-1252-837010
Mini-Circuits
Mini-Circuits ISO 9001 & ISO 14001 Certified
Typical Performance Data
Directional Coupler Electrical Specifications
Maximum Ratings
Coaxial Connections
INPUT
3
OUTPUT
2
COUPLED
1
Operating Temperature
-55C to 100C
Storage Temperature
-55C to 100C
Outline Drawing
Outline Dimensions ( )
inch
mm
ZDC-20-3-75
MAINLINE LOSS
0.0
0.2
0.4
0.6
0.8
0
30
60
90
120
150
FREQUENCY (MHz)
MAINLINE
LOSS
(dB)
at RF level of -10 dBm
ZDC-20-3-75
COUPLING & DIRECTIVITY
0
10
20
30
40
50
60
70
0
30
60
90
120
150
FREQUENCY (MHz)
C
O
U
P
L
I
N
G
&
D
I
R
E
C
T
I
V
I
T
Y
(
d
B
)
COUPLING
DIRECTIVITY
at RF level of -10 dBm
ZDC-20-3-75
ZDC-20-3-75
RETURN LOSS
0
10
20
30
40
50
60
0
30
60
90
120
150
FREQUENCY (MHz)
RETURN
LOSS
(dB)
IN
OUT
CPL
at RF level of -10 dBm
electrical schematic
INPUT
OUTPUT
COUPLED
75 1 to 150 MHz
Directional Coupler
REV. OR
M93849
ZDC-20-3-75
WZ/TD/CP
060801
Coaxial
A
B
C
D
E
F
G
H
2.25
1.38
1.24
.50
.150 3.100
.138 1.238
57.15 35.05 31.50 12.70
3.81 78.74
3.51 31.45
J
K
L
M
N
P
S
wt
3.25
.10
.40
1.15
1.86
.64
.150 grams
82.55
2.54 10.16 29.21 47.24 16.26
3.81
74.0
CASE STYLE: M22
Connectors Model
Price
Qty.
BNC
ZDC-20-3-75
$45.95 ea. (1-9)
BRACKET (OPTION"B")
$5.00
(1+)
BRACKET (OPTION"BR")
$1.50
(1+)
Frequency
(MHz)
Mainline Loss
(dB)
In-Out
Coupling
(dB)
In-Cpl
Directivity
(dB)
In
Return Loss
(dB)
Out
Cpl
Features
excellent insertion loss, 0.35 dB typ.
excellent directivity, 25 dB typ.
rugged shielded case
Applications
HF/VHF
instrumentation
amateur radio
FREQ.
RANGE
(MHz)
COUPLING
(dB)
MAINLINE LOSS
1
DIRECTIVITY
(dB)
VSWR
(:1)
POWER
INPUT
(W)
L
M
U
L
M
U
L
MU
f
L
-f
U
Nom.
Flatness Typ. Max. Typ. Max. Typ. Max. Typ. Min. Typ. Min. Typ. Min.
Typ.
Max.
Max.
1-150
19.50.5
0.75
0.35
0.8
0.35
0.8
0.35
0.8
25
20
25
20
25
20
2.0
2.0
4.0
L = low range [f
L
to 10 f
L
] M = mid range [10 f
L
to f
U
/2] U= upper range [f
U
/2 to f
U
]
1. Mainline loss includes theoretical power loss at coupled port.
1.00
0.45
19.46
41.58
25.97
24.04
24.88
1.93
0.36
19.46
47.84
29.62
26.37
27.44
9.94
0.30
19.35
56.88
32.94
30.18
31.33
20.00
0.30
19.39
43.82
35.94
30.58
28.32
46.82
0.34
19.37
35.25
34.29
29.28
22.54
73.64
0.36
19.53
43.57
30.78
28.04
18.80
85.00
0.37
19.56
33.76
29.93
27.73
17.77
119.45
0.38
19.51
31.82
28.10
26.21
14.96
146.09
0.39
19.52
30.86
28.08
25.47
13.35
150.00
0.39
19.54
29.43
27.90
25.09
13.11
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