JED - October 2013 - 66

E W101

COMBINER

PWR DIV

receiver, there is a tapped delay line
with as many stages as the number
LPF
DRFM
of bits in the code. Some of the outputs have 180 degrees phase-shiftSIGNAL
LPF
DRFM
ed outputs, so that when the pulse
IN
exactly fills the shift register, all of
LPF
DRFM
the bits add constructively. When
the pulse is not exactly aligned
SYSTEM
with the shift register, the output
VCO
VCO
VCO
L.O.
is approximately zero. This, in effect, shortens the received pulse to
LPF
the duration of one bit of the code.
SIGNAL
This compresses the range resoluLPF
OUT
tion by the ratio of the number of
bits across each pulse. Because a
LPF
jamming pulse without the barker
code is not compressed, the effective jamming to signal ratio is reFigure 4: A narrowband DRFM handles only one signal. Multiple narrowband DRFMs are required to
duced by the number of bits in the
handle a multiple-signal environment.
code. The DRFM can create jamming
pulses with the correct barker code, maintaining the full jamceiver, a compressive filter reduces the effective pulse width by
ming-to-signal ratio.
the ratio of the FM sweep range to the radar’s coherent bandwidth.
If a jammer produces signals which do not have this frequency
modulation, the effective jamming-to-signal ratio is reduced by
What‘s Next
the compression factor. By generating chirped jamming pulses,
Next month, we will continue our discussion of DRFMs, dealthe DRFM maintains the full jamming to signal ratio.
ing with other DRFM functions and related timing issues. For
Barker code pulse compression involves the binary phase
your comments and suggestions, Dave Adamy can be reached
shift keyed modulation of each pulse with a code. In the radar
at dave@lynxpub.com. a

The Journal of Electronic Defense | October 2013

66

RF & IF FREQUENCY CONVERTERS

IFAT-2400

RFT-4180

IFBT-16M

RFT-3180

IF TRANSLATOR

UPCONVERTER

UPCONVERTER

DOWNCONVERTER

IF to IF

WIDEBAND IF to RF

BASEBAND to IF

WIDEBAND RF to IF

INPUT FREQUENCY

1 MHz to 2 GHz, tunable

70 / 140 / 160 MHz

Baseband recorder freqs.

2-18, 2-26 or 2-40 GHz

OUTPUT FREQUENCY

1 MHz to 2 GHz, tunable

0.5 - 18 GHz

70 MHz

70 / 140 / 160 MHz; 1.5 GHz

13 BW’s, selectable,

50 / 100 MHz

5 BW’s, selectable,

50 / 100 MHz at IF;

2-36 MHz

1 GHz centered at 1.5 GHz

BANDWIDTH

100 kHz to 1 GHz

.

.

www syntonicmicrowave com

656621_SyntonicM.indd 1

TAKE A CLOSER LOOK.
9/9/13 8:35 PM


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JED - October 2013

Table of Contents for the Digital Edition of JED - October 2013

The View From Here
Conferences Calendar
Courses Calendar
From the President
Letters
The Monitor
Washington Report
Growing AOC’s EW Advocacy Program
World Report
Beyond CREW: Army EW Fights for a Bigger Spectrum
US Army Electronic Warfare in the Post- Global War on Terrorism World
RF Decoys for Fighter Aircraft
New Products
EW 101
AOC News
AOC 50th Annual International Symposium and Convention Guide
AOC 2013 Award Winners
Index of Advertisers
JED Quick Look
JED - October 2013 - cover1
JED - October 2013 - cover2
JED - October 2013 - 3
JED - October 2013 - 4
JED - October 2013 - 5
JED - October 2013 - The View From Here
JED - October 2013 - 7
JED - October 2013 - Conferences Calendar
JED - October 2013 - 9
JED - October 2013 - Courses Calendar
JED - October 2013 - 11
JED - October 2013 - From the President
JED - October 2013 - 13
JED - October 2013 - Letters
JED - October 2013 - The Monitor
JED - October 2013 - 16
JED - October 2013 - 17
JED - October 2013 - 18
JED - October 2013 - 19
JED - October 2013 - 20
JED - October 2013 - 21
JED - October 2013 - 22
JED - October 2013 - 23
JED - October 2013 - 24
JED - October 2013 - 25
JED - October 2013 - 26
JED - October 2013 - 27
JED - October 2013 - Washington Report
JED - October 2013 - 29
JED - October 2013 - Growing AOC’s EW Advocacy Program
JED - October 2013 - 31
JED - October 2013 - 32
JED - October 2013 - 33
JED - October 2013 - World Report
JED - October 2013 - 35
JED - October 2013 - Beyond CREW: Army EW Fights for a Bigger Spectrum
JED - October 2013 - 37
JED - October 2013 - 38
JED - October 2013 - 39
JED - October 2013 - 40
JED - October 2013 - 41
JED - October 2013 - 42
JED - October 2013 - 43
JED - October 2013 - 44
JED - October 2013 - 45
JED - October 2013 - 46
JED - October 2013 - 47
JED - October 2013 - US Army Electronic Warfare in the Post- Global War on Terrorism World
JED - October 2013 - 49
JED - October 2013 - 50
JED - October 2013 - 51
JED - October 2013 - 52
JED - October 2013 - 53
JED - October 2013 - RF Decoys for Fighter Aircraft
JED - October 2013 - 55
JED - October 2013 - 56
JED - October 2013 - 57
JED - October 2013 - 58
JED - October 2013 - 59
JED - October 2013 - New Products
JED - October 2013 - 61
JED - October 2013 - EW 101
JED - October 2013 - 63
JED - October 2013 - 64
JED - October 2013 - 65
JED - October 2013 - 66
JED - October 2013 - 67
JED - October 2013 - AOC News
JED - October 2013 - 69
JED - October 2013 - 70
JED - October 2013 - 71
JED - October 2013 - 72
JED - October 2013 - 73
JED - October 2013 - 74
JED - October 2013 - AOC 50th Annual International Symposium and Convention Guide
JED - October 2013 - 76
JED - October 2013 - 77
JED - October 2013 - 78
JED - October 2013 - 79
JED - October 2013 - 80
JED - October 2013 - 81
JED - October 2013 - 82
JED - October 2013 - 83
JED - October 2013 - 84
JED - October 2013 - 85
JED - October 2013 - 86
JED - October 2013 - 87
JED - October 2013 - 88
JED - October 2013 - 89
JED - October 2013 - 90
JED - October 2013 - 91
JED - October 2013 - 92
JED - October 2013 - 93
JED - October 2013 - 94
JED - October 2013 - 95
JED - October 2013 - 96
JED - October 2013 - 97
JED - October 2013 - 98
JED - October 2013 - 99
JED - October 2013 - 100
JED - October 2013 - 101
JED - October 2013 - 102
JED - October 2013 - 103
JED - October 2013 - 104
JED - October 2013 - AOC 2013 Award Winners
JED - October 2013 - 106
JED - October 2013 - 107
JED - October 2013 - 108
JED - October 2013 - 109
JED - October 2013 - 110
JED - October 2013 - 111
JED - October 2013 - Index of Advertisers
JED - October 2013 - 113
JED - October 2013 - JED Quick Look
JED - October 2013 - cover3
JED - October 2013 - cover4
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