
Model 115A thru 119A
dc to 18.0 GHz
Manual Step Attenuators
2 Watt
Choice of Type N, GPC-7, TNC, SMA Connector
Features
! Safety Mechanical Stop - A mechanical stop between
maximum and 0 attenuation positions on all models
prevents damage to the mechanical drive as well as
preventing large power changes that could cause dam-
age to sensitive equipment.
! Choice of Attenuation Ranges - Five standard atten-
uation ranges are available: 0-9 dB, 0-69 dB, and 0-99
dB in 1 dB steps, and 0-60 dB and 0-90 dB in 10 dB
steps.
! Broadband - All models are available in a choice of 3
frequency ranges: dc-4, dc-12.4, and dc-18 GHz (dc-16
for units with TNC connector).
! Right-Angle Drive - The center conductor of the con-
nector is perpendicular to the control shaft, offering
greater flexibility of applications: panel mounting or
bench setup. All models are bidirectional.
! Custom Configurations Available Upon Request.
! Low Deviation from Nominal Value - These Mini Step
Attenuators have flat frequency response over speci-
fied bands and excellent attenuation accuracy.
Deviation from nominal value is low at all settings.
! Excellent Repeatability and Long Life Switch -
Repeatability is better than 0.05 dB to 18.0 GHz for
over 1,000,000 switchings of the drum.
Description
The Weinschel Corporation Models 115A through 119A are
a series of broadband,
step attenuators in a right-angle
drive configuration, where the center conductor of the con-
nector is perpendicular to the control shaft. They feature
excellent performance characteristics suitable for use in
high reliability 50 ohm systems and applications requiring
extra-small components for the precision control of power in
discrete steps. They can be used either as input or output
attenuators in signal sources, receivers, field strength
Specifications
NOMINAL IMPEDANCE: 50
FREQUENCY RANGE (add Model No. Prefix to
Designate Range):
All Models:
dc to 4.0 GHz (AC)
dc to 12.4 GHz (AE)
dc to 18.0 GHz (AF)*
*dc to 16.0 GHz for TNC connector
STANDARD INCREMENTAL ATTENUATION RANGE:
Model 115A:
0 to 9 dB in 1 dB steps
Model 116A:
0 to 60 dB in 10 dB steps
Model 117A:
0 to 69 dB in 1 dB steps
Model 118A:
0 to 90 dB in 10 dB steps
Model 119A:
0 to 99 dB in 1 dB steps
MAXIMUM SWR (Models 117A & 119A):
Frequency
SMA, N
Range (GHz)
GPC-7
TNC
dc - 4
1.35
dc - 12.4
1.55
dc - 18
1.70
POWER RATING: 2 watts average to 25°C ambient
temperature, derated linearly to 1 watt @ 54°C. 200 watts
peak (5
sec pulse width; 0.5% duty cycle)
POWER COEFFICIENT: < 0.005/dB/dB/watt
TEMPERATURE COEFFICIENT: < 0.0004/dB/dB/°C
TEMPERATURE RANGE: Operating:
0°C to +54°C
Nonoperating: -54°C to +54°C
INCREMENTAL PHASE SHIFT: ~0.5° per dB x f(GHz)
REPEATABILITY: Better than 0.05 dB across frequency
band for switch life.
SWITCH LIFE: Over 1,000,000 steps
INDEXING: 36°
MAXIMUM SWR (Models 115A, 116A, & 118A):
Frequency
SMA, N
Range (GHz)
GPC-7
TNC
dc - 4
1.25
1.30
dc - 12.4
1.50
dc - 18
1.60
Weinschel
5305 Spectrum Drive, Frederick, MD 21703-7362
! TEL: 301-846-9222, 800-638-2048 ! Fax: 301-846-9116
web: www.weinschel.com
! email: sales@weinschel.com
CORPORA TION
119
5/25/99