Power Monitors
and Sensors
RF Switching
Products
Passive
Components
Integrated Microwave
Assemblies (IMAs)
Introduction
Step Attenuators
DC-18 GHz
Thumb Wheel and Panel Mount
Step Attenuators
y
y
y
y
y
Specifications
Type N (F), DC to 18 GHz
FREQUENCY
RANGE
(GHz)
ATTENUATION
(dB)
0-9
in 1 dB steps
0-9
in 1 dB steps
0-60
in 10 dB steps
0-60
in 10 dB steps
0-69
in 1 dB steps
0-69
in 1 dB steps
RESETTABILITY
PER DRUM AVERAGE
(dB)
(W)
<0.05
<0.05
<0.05
<0.05
<0.05
<0.05
2
2
2
2
2
2
POWER
PEAK
(kW at duty
cycle of 0.0001)
0.2
0.2
0.2
0.2
0.2
0.2
VSWR
(max.)
1.50
1.50
1.50
1.50
DC-12.4 GHz: 1.50
12.4-18 GHz: 1.65
DC-12.4 GHz: 1.50
12.4-18 GHz: 1.65
IMPEDANCE
(ohms)
50
50
50
50
50
50
TEMPERATURE
STABILITY
(dB/dB/°C)
0.0001
0.0001
0.0001
0.0001
0.0001
0.0001
Broadband DC-18 GHz
Small Size
Precision Construction/High Reliability
Precision 1 dB or 10 dB steps, to 69 dB
Panel Mount* or Stand Alone
MODEL
CONNECTOR
741
4741
743-60
DC-18
4743-60
745-69
4745-69
Type N (F)
SMA (F)
Type N (F)
SMA (F)
Type N (F)
SMA (F)
Relative Attenuation Deviation (dB)
MODEL
741, 4741
STEP (dB) DEVIATION
0
1
2
3
4
5
6
7
8
9
0.5
± 0.5
± 0.5
± 0.5
± 0.5
± 0.5
± 0.5
± 0.5
± 0.5
± 0.5
MODEL
743-60, 4743-60
STEP (dB) DEVIATION
0
10
20
30
40
50
60
0.5
±0.5
±0.7
±0.9
±1.0
±1.3
±1.5
MODEL
745-69, 4745-69
STEP (dB) DEVIATION
0
1-9
10-19
20-29
30-39
40-49
50-59
60-69
1.0
±0.5
±1.0
±1.2
±1.4
±1.5
±1.9
±2.0
* Field-installable Mounting Kit must be purchased separately
as Part No.
43017200.
Rack Mounting Kit accommodates all attenuator series housings.
www.nardamicrowave.com
E-MAIL:
nardaeast@L-3com.com
TEL:
+1 631 231-1700
microwave-east
an
company
57
Introduction
Integrated Microwave
Assemblies (IMAs)
Passive
Components
RF Switching
Products
Power Monitors
and Sensors
Step Attenuators
Ordering Information
1. Prefix “7” denotes Type N Stainless Steel Connectors (741, 743, 745).
Prefix “47” denotes SMA Stainless Steel Connectors (4741, 4743, 4745).
2. All units are bidirectional.
3. Field-installable Mounting Kit must be purchased separately as Part No. 43017200.
Outline Drawing
MODEL
741
743-60
745-69
4741
4743-60
4745-69
A
1.125
(28.75)
1.437
(36.5)
2.250
(57.15)
1.125
(28.75)
1.437
(36.5)
2.250
(57.15)
B (max.)
.781
(19.83)
.781
(19.83)
.781
(19.83)
.437
(11.10)
.437
(11.10)
.437
(11.10)
CONNECTOR
Type N
(F)
Type N
(F)
Type N
(F)
Type SMA
(F)
Type SMA
(F)
Type SMA
(F)
Dimensions in inches (mm in parentheses), unless otherwise specified.
Connectors made without interference per MIL-STD-348.
58
microwave-east
an
company
www.nardamicrowave.com
E-MAIL:
nardaeast@L-3com.com
TEL:
+1 631 231-1700
Power Monitors
and Sensors
RF Switching
Products
Passive
Components
Integrated Microwave
Assemblies (IMAs)
Introduction
Step Attenuators
Panel Mounting Brackets Installation Instructions
For Older Devices without Mounting Holes:
FRONT SCREWS
(REF)
8 2
SEE NOTE 1
REAR SCREWS
(REF)
DO NOT LOOSEN
This drawing gives instructions for installation of panel
mounting brackets on a model 741, 4741, 743, 4743,
745, 4745, thumbwheel turret attenuator.
1.
Working: from the front of side “A”, remove the
two FRONT screws.
DO NOT loosen or other-
wise disturb the two rear screws.
2.
Install mounting bracket (item 3) using two
flat head screws (item 8) as shown on side “A”.
3.
Install mounting bracket (item 3) using two
flat head screws (item 7) as shown on side “B”.
4.
Make sure mounting brackets are flush with
front of unit.
3 2
2 7
FRONT
SIDE “A”
SIDE “B”
RoHS COMPLIANT IAW EU
DIRECTIVE (2002/95/EC)
NO MOUNTING HOLES
(MODEL 4741 SHOWN)
For Newer Devices with Mounting Holes:
FRONT SCREWS
(REF)
REAR SCREWS
(REF)
10 4
9 4
2 4
1.
Working from the front of side “B”, locate
inboard bracket mounting holes.
2.
Install bracket (item 3) using screw lock washer
(item 10) and flat washer #6 (item 2). Carefully
insert the screw assembly through the inboard
mounting holes on the bracket and into the
inboard screw holes on the housing.
3.
Make sure the bracket is flush with the front of
the unit and tighten the screws.
4.
Repeat above steps for “A” side.
3 2
7
SIDE “A”
FRONT
SIDE “B”
INBOARD BRACKET
MOUNTING HOLES
FIND NO.
10
9
8
8
7
7
3
2
4x
R.13
IDENT. NO.
535338136
70152019
551959020
551959019
551959015
551959022
42452200
515795805
DESCRIPTION
LOCKWASHER #6
SCR, SOCKET HD. #632 x 3/8 L.
SCR, FLAT #4-40 x 7/8 LG.
SCR, FLAT HD. #4-40 x 3/4 LG.
SCR, FLAT HD. #4-40 x 3/8 LG.
SCR, FLAT HD. #4-40 x 1-1/4 LG.
BRACKET MOUNTING
WASHER, FLAT #6
4x
R.13
1.83
Materials Supplied
with Mounting Kit
Part Number 43017200
QTY. FOR
MODELS 741, 4741,
743 and 4743
4
4
2
—
2
—
2
4
4x
R.13
1.83
QTY. FOR
MODELS
744 and 4745
4
4
—
2
—
2
2
4
Suggested Cutouts
Dimensions in inches,
unless otherwise specified.
2x
Ø.128
.23
1.17
1.621
.91
.91
.91
1.83
2x
Ø.128
.23
1.48
1.932
2x
Ø.128
.23
2.29
2.741
741 and 4741
www.nardamicrowave.com
743-60 and 4743-60
TEL:
+1 631 231-1700
745-69 and 4745-69
microwave-east
an
company
E-MAIL:
nardaeast@L-3com.com
59
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