Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602 Fax:+44 (1274) 539724 Email: sales@fcl.com
Page 1 of 1
Man Portable Radar
Warning Receiver
Introduction
The unit is designed for Radar Warning Receiver (RWR) applications where small size and low power
consumption are of prime importance, with filtering, amplification, detection and frequency
measurement being combined into one multi-function unit.
Figure 2 shows a block diagram of the RWR and its three integral RF modules. Two amplitude
measurement channels allow direction finding by amplitude comparison between adjacent antennas.
One of these channels is also used in standby mode for detecting the presence of signals by polling
round the antennas. A two-tier discriminator, fed from one of the amplitude channels via an SPDT
switch, performs frequency measurement. Frequency resolution is nominally 160 MHz over an 8 to 18
GHz band.
N
S
E
W
Video
Output
Video
Output
Linear
Amplifier
Bandpass
Filter
DLVA
Limiting
Amplifier
Trigger
Digital
Data Out
IFM
Inputs
Figure 2: Radar Warning Receiver Block Diagram
Figure 1 RWR Unit
For Covert and U.A.V.
Applications
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: sales@fcl.com
Page 2 of 2
Man Portable Radar Warning Receiver
Electrical Specifications
Operating temperature range 0C to 70C
Characterised at 25C.
Table 1: Electrical Specifications
Parameter
Amplitude Module
Frequency Module
Operating Frequency
8 to 18 GHz
8 to 18 GHz
Operating Dynamic Range
-73 to 0dBm
-43 to 5 dBm
1
Frequency Measurement Resolution
-
150 MHz nom.
Frequency Measurement Accuracy
-
<200 MHz r.m.s.
Minimum Pulse Width
-
100 ns
Triggering -
External
Command
Trigger to Data Delay
-
<100 ns max.
Out of Band Rejection
d.c. to 7 GHz > 60 dB
20 to 26 GHz > 30 dB
-
Tangential Signal Sensitivity (8 dB Video SNR)
-73 dBm
-
Logging Range
-70 to -30 dBm
-
Frequency Flatness (Video)
2.5 dB
-
Amplitude Tracking (Between any Two Modules at the
Same Frequency and Temperature)
1 dB
Typical
-
Video Rise Time
30ns Typ 70 ns Max
-
Video Output Slope
50 mV/dB
-
Logging Linearity
1 dB
-
Video Coupling
Active d.c. restored
-
Maximum Duty Cycle
50 %
-
RF Input Switch Isolation
>30 dB Typ
>30 dB Typ
RF Input Switch Speed
<5 s
<5 s
RF Input Switch Control
TTL
TTL
Insertion Gain RF Input to RF Output
27dB nominal
-
Insertion Ripple
2dB
Input Return Loss
7dB min (10dB typ)
Power Supply Current (operating - no rf)
+6 V at 130 mA
-6 V at 50 mA
+6 V at 200 mA
-6 V at 30 mA
Power Supply Current (standby)
+6 V at 50 mA
-6 V at 50 mA
+6 V at 120 mA
-6 V at 30 mA
Power-up Time (standby to on)
<100 s
<100 s
Power-up Time (cold start)
<30ms
<2ms
Dimensions
4 x 1 x 0.25 inches
101.6 x 25.4 x 6.35 mm
4 x 2 x 0.25 inches
101.6 x 50.8 x 6.35 mm
Weight
2
50
grams
85
grams
Microwave Input Connector
SSMA Female
Dynawave
1
not including amplitude module gain
2
plus 10 grams for the interconnect module
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: sales@fcl.com
Page 3 of 3
Man Portable Radar Warning Receiver
System Timing
The operation of the frequency measurement unit is as follows:
When r.f. enters the discriminator circuits, the video voltages settle after a delay
depending on the video bandwidth. The video signals are then stable and can be
digitised by the comparators and ASIC. This digitization takes a maximum of 15 ns
(ASIC worst case timing). Therefore valid raw frequency data is available 75 ns after
the leading edge of the r.f. pulse. The raw frequency data is decoded in the EPROM
look-up table which takes 55 ns.
Figure 3: System Timing Diagram
t
latch
t
dig
t
decode
r.f.
video out
LATCH
Raw Data
Frequency Data Out
t
rfhld
t
lhold
t
dechold
t
meas
Data Valid
t
lpw
Table 2: Timing
Description
symbol min max units
time between latch edge and trailing edge of r.f t
rfhld
6
ns
time from leading edge of r.f. and latch edge
t
latch
60
ns
Width of latch pulse
t
lpw
5
ns
time to digitise video
t
dig
15
ns
time from latch disable and raw data invalid
t
lhold
10
ns
time to decode raw frequency data
t
decode
55 ns
time to hold decoded frequency data
t
dechold
7 ns
time from start of r.f. to valid frequency out
t
meas
130
ns
The LATCH signal holds the digitised frequency data when it is in the logic high
state. When the LATCH signal is low, the digitising circuits are transparent and the
data buses may change state rapidly increasing current consumption, thus to reduce
this effect the latch signal should be held high and digitising initiated by a narrow
logic low pulse. In order to capture 100 ns pulses the rising edge of the LATCH signal
must occur no later than 94 ns after the start of the r.f. pulse.
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: sales@fcl.com
Page 4 of 4
Man Portable Radar Warning Receiver
Application Information
The Amplitude Measurement Module and the Frequency Measurement Module are
designed to be used together as the front end for a Radar Warning Receiver. The
configuration described here has two Amplitude Modules facilitating direction of
approach measurement from 4 directional antennae. If desired, only one Amplitude
Module can be used in conjunction with an omni directional antenna forming a simple
Radar Warning Receiver for simple classification of the threat signal. The unused
input ports must be terminated with 50
loads.
Both modules feature a power saving standby mode that turns off the bias to the
microwave amplifiers. The power supply can be removed completely for better
power efficiency but there is a penalty to pay in start-up time as the modules
incorporate switch mode DC-DC converters that take time to stabilise. The amplitude
module also incorporates a CW removal circuit which can take up to 30ms to
stabilise.
The frequency measurement module requires an externally generated latch signal to
hold the frequency data word on the digital output. This can be derived from the
amplitude measurement video output or from some other source. The responsibility
for generating the latch rests with the application circuit. Refer to figure 3 for timing
information for the latch generation.
Options and Future Developments
Other configurations may be possible, e.g., SMA connectors instead of SSMA,
custom outline, different logging range, etc. In addition Filtronic is developing this
product further to provide extended frequency range and a back end control system to
integrate the trigger, direction of approach and emitter characterisation functions.
Please contact the factory for further details.
While every effort is made to ensure the accuracy this release, please check with the
factory for the latest information.
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: sales@fcl.com
Page 5 of 5
Man Portable Radar Warning Receiver
Typical Performance Data
Figure 4: Log plot at 8 GHz
Figure 5: Log plot at 13 GHz
Figure 6: Log plot at 18 GHz
Figure 7: Frequency Flatness at 50dBm input
Figure 8: Cell size distribution - CW
Figure 10: Cell size distribution 100ns pulse
Figure 9: Frequency accuracy - CW
Figure 11: Frequency accuracy 100ns pulse
PDF 
ZIP