SI-9144 DUAL-CHANNEL PHASE- COHERENT VHF/UHF TUNER

Meeting Today’s Challenges to Provide a Secure Future
SI-9144 DUAL-CHANNEL PHASE-
COHERENT VHF/UHF TUNER
The SI-9144 is a subminiature, microprocessor-controlled,
dual-channel, wideband tuner capable of tuning over the
VHF/UHF spectrum from 20 to 3000 MHz. The SI-9144’s
small size and low power consumption make the unit
ideal for portable wideband tuning applications where
power reduction and weight are crucial considerations.
The unit is controlled remotely over a single- or multi-drop
RS-232C or a low-speed universal serial bus (USB 1.1)
interface. All microprocessor-controlled functions are
accessible over each of the control interfaces. The
SI -9144 can be confi gured to operate with either the
internal 10 MHz reference oscillator or an external
10 MHz reference input signal. This reference standard
may be provided or accepted via the front panel.
The unit features low phase noise, fast tuning and high
dynamic range. Each wideband tuner channel provides
100-kHz tuning resolution.
In addition to manual gain control, the unit provides an
automatic gain control (AGC) algorithm that can be used
to maintain the 70 MHz IF output of each channel at a
selectable level.
In addition to fi xed frequency tuning, the SI-9144 provides
a sweep scan (coverage from a start to a stop frequency in
defi ned steps) and a step scan (preprogrammed discrete
frequencies). The SI-9144 is sequenced through scan
scenarios via an advance command or a hardware strobe.
The SI-9144 may be remotely confi gured to distribute
its local oscillator (LO) signals to operate either in the
phase-coherent (Master/Slave) local oscillator (LO) mode
or in an independent LO mode. Additionally, two SI-9144
tuners can be confi gured to provide four phase-coherent
channels. Channel 1 of the fi rst SI-9144 is confi gured as
the LO master and sources its fi rst and second LO signals
to Channel 2 and to the second SI-9144.
The SI-9144 is designed to use a single standard
commercial-off-the-shelf (COTS) camcorder battery. The
battery attaches directly to the rear panel of the unit.
The wide input voltage range of 8 to 16 Vdc allows for
operation from a variety of COTS camcorder-type batteries
or power supplies. The system consumes less than 8.0
watts during normal operation. A power standby mode
extends battery life during periods of inactivity.

HIGHLIGHTS
• Operates as a Dual-channel Phase-coherent Tuner or
as Two Independent Tuners
• Two 70 MHz IF Outputs with Either a 6 or 25 MHz
User-selectable IF Bandwidth
• Automatic Gain Control (AGC) Functionality
• 20 to 3000 MHz tuning range
• Compact, Single-unit “Brick” Approach Simplifi es
Transport and Deployment
• Total Power Consumption less than 8 watts
• RS-232C (Single- or Multi-drop) or USB Remote
Control
• Optional Battery for Operation without an External
Power Supply
SPECIFICATIONS
Tuning
Range
20 to 3000 MHz (tuning to
0 Hz allowed)
Resolution
100 kHz
Speed
1 MHz Step Size 3 milliseconds, typical to
within 1 kHz of fi nal frequency
after receipt of the last byte of
the frequency command
Any Step Size 15 milliseconds, maximum to
within 1 kHz of fi nal frequency
after receipt of the last byte of
the frequency command
25 MHz IF Passband
3-dB Bandwidth 25 MHz, nominal
6 MHz IF Passband
3-dB Bandwidth 6 MHz, nominal
Interface
RS-232C
Single-drop
150 Baud to 38.4 kBaud
Multi-drop
150 Baud to 38.4 kBaud
(eight units maximum)
USB 1.1, Low-speed
SWAP
Size
Width
4.00 inches (10.160 cm)
Height
1.57 inches (3.988 cm)
Length
(with Connectors) 7.38 inches (18.745 cm)
with the 9144/BAT* 9.40 inches (23.876 cm)
Weight
without 9144/BAT* 2.80 lbs (1.27 kg)
with 9144/BAT* 3.81 lbs (1.728 kg)
Power Consumption (7-16 Vdc)
Normal Operation
(Low-power Mode 0) 8.0 watts, maximum
Low-power Mode 1
(both Tuner Channels) 4.2 watts, maximum
Low-power Mode 2
(both Tuner Channels) 1 watts, maximum
Sleep Mode
10 milliwatts, maximum
Standby Mode 10 milliwatts, maximum
*Battery Option
ENVIRONMENTAL
Operating Temperature
Range
Storage Temperature
Range
Specifi cation-compliant
Temperature Range
Humidity
ORDERING INFORMATION
SI-9144
-20° to +60°C (-4° to
+140°F), case temperature
-40° to +70°C (-40° to
+158°F)
+20° to +30°C (+68° to
+86°F)
10 to 90% (non-condensing)
Dual-channel, phase-coherent tuner with
two 70 MHz IF outputs with remote selectable
25 MHz or 6 MHz IF bandwidths.
OPTIONS
9144/BAT Battery option which includes a rear panel
battery fi xture, a battery, a battery charger,
and a power cable.
9144/GANGCABLES
Provides two LO distribution cables and one
auxiliary cable to connect two SI-9144
Tuners in a four-channel phase-coherent
confi guration.
9144/9475CABLES
Provides a power/control cable and two
IF cables to connect the SI-9144 Tuner to
the SI-9475 Digitizer.
DRS-SS APR. Export of DRS SIGNAL SOLUTIONS, INC. products is subject to U.S. export controls. Licenses may be
required. This material provides up-to-date general information on product performance and use. It is not contractual
in nature, nor does it provide warranty of any kind. Information is subject to change at any time. Copyright ©
DRS SIGNAL SOLUTIONS, INC. 2010. All Rights Reserved.
P/N 14000007-001 │ Revision A │ November 2010
DRS Signal Solutions, Inc.
700 Quince Orchard Road, Gaithersburg, MD 20878-1974 Tel 1.301.948.7550 Fax 301.921.9479 www.drs-ds.com │ sales@drs-ds.com