TECHNICAL SPECIFICATION
VXI-3570A VHF/UHF DSP RECEIVER
FEATURES
• Wide Tuning Range: 20 - 3000 MHz
• 10 Hz tuning resolution
• Quadrature digital IF output (I&Q)
• Slave LO input/output for DF applications
• 10 Hz tuning resolution
• Internal frequency reference (option)
• C40 communications port output (option)
• Sweep and scan functions up to 100 channels
per second
• 18 Synthesized digital IF filters
• 11 Preselection filters
• High dynamic range:
IP3 >+10 dBm typical
NF 12 dB typical
DESCRIPTION
The VXI-3570A is a high performance multi-mode digital signal processing (DSP) receiver with a
frequency range from 20 to 3000 MHz. The message-based receiver is a single C-size module and
functions as a servant to another device which acts as its commander.
The receiver can detect a wide variety of signals. These include: amplitude modulation (AM), upper
sideband (USB), lower sideband (LSB), continuous wave (CW), and frequency modulation (FM). Frequency shift-keyed (FSK) signals can be demodulated as a single sideband suppressed carrier or as
true FM signals using an external demodulator or the DC coupled video outputs. The selected detector
output is available as an audio signal on a 600 ohm balanced line. It is also available as a DC coupled
video signal on a single ended line. The receiver uses an external (or optional internal) reference to
generate the 10 MHz synthesizer reference frequency. A headphone jack is provided on the front panel
to monitor the audio output.
Each local oscillator (LO) signal is jumpered through front panel connectors. This allows two or more
receivers to use common LO signals to tune coherently to the same frequency. When used with separate antennas and multichannel phase measuring equipment, the direction of a transmitted signal can
be determined.
An ISO 9001:2000 Certified Company
VXI-3570A VHF/UHF DSP RECEIVER SPECIFICATION
FREQUENCY
Frequency Range: 20 to 3000 MHz
Tuning Resolution: 10 Hz
Synthesizer Tuning Speed (from
receipt of the last command byte until
within 1 kHz of the final frequency):
AM, FM, LSB, USB
∆f <100 kHz 0.7 msec, typical
∆f <50 MHz 1.2 msec, typical
∆f <500 MHz 2.4 msec, typical
20 MHz to 100 MHz: 1.8 msec,
maximum
100 MHz to 599 MHz, 2.0 msec,
maximum
600 MHz to 3000 MHz,
4.0 msec, maximum
Switching across 600 MHz,
1200 MHz, 1800 MHz,
2400 MHz & 2642.8 MHz: 4.0 msec, maximum
Tuning Accuracy:
External Frequency Standard of
10 MHz: Tuned frequency equal
to accuracy of external standard in
ppm (input power level of 0
±4 dBm
Internal Frequency Reference
Option TCXO, 1 ppm of tuned
frequency
DETECTION MODES
AM, FM - All bandwidths
USB, LSB, CW - bandwidths <15 kHz
SCAN AND SWEEP
Memory Channels: 250 programmable
channels
Scan: Up to 250 channels
Sweep: f1 to f2 at selected steps.
Up to 125 sweep bands
Sweep and Scan Rate: 1 to 100 per
second
Adjustable Threshold: 1 dB increments
RF SECTION
RF Input Impedance: 50 ohms, nominal
RF Input VSWR: 1.5:1 typical, 3.0:1
maximum at the tuned freq.
Sensitivity:
AM (6 kHz BW): <2400 MHz,
-103 dBm; <2700 MHz, -99 dBm;
<3000 MHz, -95 dBm. Input signal
modulated 50% by a 1 kHz tone will
produce a minimum output (S+N)/N
ratio of 10 dB
FM: (50 kHz BW): <2400 MHz,
-102 dBm; >2400 MHz, -94 dBm. Input signal modulated at a 1 kHz rate
with a peak deviation equal to 30% of
the selected bandwidth will produce a
minimum output
(S+N)/N ratio of 17 dB, de-emphasis on.
SSB (3 kHz BW): <2400 MHz,
-111 dBm; >2400 MHz, -103 dBm.
Input signal will produce a minimum
output (S+N)/N ratio of 10 dB
Noise Figure:
F <2400 MHz, 12 dB typical,
16 dB maximum;
F >2400 MHz, 20 dB typical,
23 dB minimum
RF Input Protection: Activates at signal levels between +10 dBm and +20
dBm. Protects from input signals up
to 1 watt continuous,
50 watts (1 msec. pulse, .001 duty
cycle)
RF Filters: An 11-band preselector set
consisting of the following bands:
Band Frequency (MHz)
1
20 - 93
2
93 - 156
3
156 - 260
4
260 - 430
5
430 - 720
6
720 - 1200
7
1200 - 1600
8
1600 - 2000
9
2000 - 2400
10
2400 - 2800
11
2800 - 3000
Automatic Gain Control (AGC):
LSB, USB: Fast attack selectable
decay
Attack Time: <10 ms for 50 dB
change
Decay Time: Selectable 0 to
4 sec nominal for 50 dB change
AM, FM: Average attack and decay
times 50 ms nominal for 50 dB
change
Sweep and Scan: Attack time
<2 ms (6 kHz or greater BW)
Dynamic Range: Output level held to
±1 dB over a 95 dB range
Threshold: -110 dBm nominal
Dump: Bus-controllable, time
<2 ms
Manual Gain Control (MGC): Buscontrollable over 127 dB in 1 dB
nominal steps
Automatic Frequency Control (AFC):
Tracking Range: ±5 times IF bandwidth
Acquisition range ±50% of IF bandwidth
Squelch: Operates on selected carrierto-noise ratios of 0 dB to 99 dB
IF SECTION
First IF: 1621.4 MHz (RF = 20 1200 MHz), 421.4 (RF = 1201 3000 MHz)
Second IF: 21.4 MHz
Third IF: 1.4 MHz
Fourth IF (DSP): IF filters 18 standard bandwidths (in kHz): 240, 180, 150, 110, 100, 60, 50, 35,
30, 25, 20, 15, 10, 6.0, 5.0, 3.0, 2.0
and 1.0
Shape Factor: Better than 1.5:1,
6 dB - 80 dB
Inband Ripple: 1 dB maximum
INTERFERENCE IMMUNITY
IF Rejection: 90 dB typical
Image Rejection:
<1200 MHz, 70 dB typical;
>1200 MHz, 50 dB typical
Blocking: Attenuation of a desired RF
signal of -60 dBm and caused by an
unmodulated unwanted signal of
-10 dBm, spaced 20 MHz away, is
less than 3 dB
Reciprocal Mixing: With an input at
rated sensitivity level in
50 kHz bandwidth, an out-of-band
signal 500 kHz removed and 52 dB
higher in level will not degrade the
(S+N)/N of the desired signal by
more than 3 dB
Oscillator Reradiation:
-60 dBm typical
Generated Spurious: -105 dBm equivalent RF input, 15 max.
Intermodulation:
2nd Order Intercept: +55 dBm typical
3rd Order Intercept Point:
Out of Band:
Measured at Audio out or WBIF out
Two tones @ -20 dBm, >10 MHz spacing
20 MHz<Fr<93 MHz, ≥ +8 dBm min
93 MHz<Fr<1200 MHz, ≥ +10 dBm
min
Fr>1200 MHz, ≥ +3 dBm min
In Band:
Measured at WBIF out,< -37 dBc typical
Two tones @ -20 dBm, 2 MHz spacing
Measured at Audio out,< -40 dBc min
Two tones @ -15 dBm, 2 kHz spacing
Synthesizer Phase Noise:
Frequency Offset
Phase Noise
(dBc/Hz)
1 kHz
-77
10 kHz
-81
100 kHz
-95
ANALOG-TO-DIGITAL
VXI-3570A VHF/UHF DSP RECEIVER SPECIFICATION
CONVERTER
A/D Bits: 14
A/D Sampling Range: 2 Ms/s
A/D Dynamic Range: 80 dB
OUTPUTS
WBIF: Centered at 21.4 MHz, bandwidth 15 MHz, 21 dB gain nominal
NBIF: Centered at 21.4 MHz, bandwidth 0.5 MHz nominal, gain
= 73 dB nominal up to -10 dBm nominal output level
Digital I&Q: TTL (0 to +5V) serial data
@ 12.5 MHz rate. Also available
over VXI backplane up to 150 kHz
BW
Audio Line Output:
AM, LSB, USB: 0 ±3 dBm over AGC
dynamic range, THD <2%
FM: 0 ±3 dBm for deviation equal to
30% of selected bandwidth, THD
<3% (de-emphasis on)
Audio Frequency Response:
100 Hz to 15 kHz within 3 dB
600 ohms balanced pair, short circuit
protected
Video: 600 mV peak-to-peak into
75 ohms (deviation equivalent to
30% of selected bandwidth in FM or
50% modulation in AM)
Video Frequency Response: DC to 1/2
the IF bandwidth, -3 dB
FM De-emphasis: Flat, 75 µs (60 - 240
kHz BW) or 750 µs (6 50 kHz BW)
Headphones: 0 to 0.5V peak-to-peak
open circuit, 0 to 0.2V peak-to-peak
into 8 ohm load impedance to front
panel phone jack. Short circuit protected
CONTROL
The receiver is a VXI message-based
servant
RELIABILITY
MTBF: 11,000 hours. Calculated
based on “Naval Sheltered” (NS) as
defined in MIL-HDBK-217F
MAINTAINABILITY
Mean-Time-to-Repair (MTTR) of not
more than 30 minutes at the unit replacement level
POWER REQUIREMENTS
+24 VDC
@ 700 mA
+12 VDC
@ 2000 mA
-12 VDC@ 300 mA
+5 VDC
@ 1500 mA
-5.2 VDC@ 200 mA
FRONT PANEL CONNECTORS
ANT:
SMA
WBIF:
SMA
NBIF:
SMA
LO In: Sub D triaxial male
LO Out: Sub D triaxial female
DSP Out: 25 pin Sub D (audio & digital
IF)
PHONE: 1/8” phone plug
C40 Out: 25 pin Sub D
Reference: SMB
FRONT PANEL INDICATOR
“FAILED” Red LED
ENVIRONMENTAL DATA
Operating High Temperature:
MIL-STD-810, Method 501.3, Procedure II, Table 501.3-I (ambient air
conditions), maximum test temperature
50ºC, one cycle
Operating Low Temperature:
MIL-STD-810, Method 502.3, Procedure II, Temperature 0ºC
Storage High Temperature:
MIL-STD-810, Method 501.3, Procedure I, 71°C, one cycle
Storage Low Temperature:
MIL-STD-810, Method 502.3, Procedure I, Temperature -40°C for 12
hours
Humidity: MIL-STD-810, Method
507.3, Procedure I-Natural, Table
507.3-I, five cycles total
Shock: MIL-STD-810, Method 516.4,
Procedure VI
Vibration: MIL-STD-810, Method
514.4, Procedure I, Category 9,
Figure 514.4-15
EMI/EMC
Equipment designed to intent of the
applicable requirements of MIL-STD
461/462 as a guide
DESIGN AND CONSTRUCTION
MIL-STD-2036, Paragraph 5.1.4 as a
guideline
Workmanship: MIL-STD-454L, Requirement 9 as a guideline
Interchangeability: All identical units,
assemblies and replacement parts
are physically, electrically and functionally interchangeable
DIMENSIONS AND WEIGHT
Size: VXI size C, single width
Weight: <6 lbs
FINISH
Front Panel: FED-STD-595 chip
26307, semi-gloss grey enamel
Chassis: Corrosion protected following guidelines established in
MIL-STD-454L, Requirement 15
Handles and Silkscreen Markings:
Matte black
C40 OPTION:
The C40 interface option allows connection and monitoring of the I&Q data
with an external C40 interface unit.
The 32-bit serial data is converted into
four 8-bit parallel bytes. When the
receiver has data for the C40 interface
unit, it invokes the strobe line. When
the C40 unit is ready to receive the
data, it invokes the ready line. This
cycle continues until all of the data is
transferred.
NOTE: Applicable to bandwidths less
than 200 kHz
VXI-3570A VHF/UHF DSP RECEIVER SPECIFICATION
The VXI-3570A 20 - 3000 MHz receiver is a triple-conversion superheterodyne design in which the final IF filtering and demodulation are accomplished with digital signal processing (DSP) for superior accuracy and flexibility.
The first IF is at 1621.4 MHz for the tuning range 20 - 1200 MHz, and 421.4 MHz for the tuning range 1201 - 3000
MHz. The second IF is 21.4 MHz and the third is at 1.4 MHz. At the third IF, the signal is converted to digital form
at a sample rate of 2 Ms/s. Digital signal processor chips then provide fine tuning, IF filtering to the selected bandwidth, and AM, FM or product detection according to the operating mode. Eighteen bandwidths are offered from 1
kHz to 240 kHz with video output up to 120 kHz. The demodulated signals are converted back to analog form for
output to headphones or balanced lines.
Ordering Information
Model
Part Number
Description
VXI-3570A
2804-1000-24
VHF/UHF DSP Receiver, 20 - 3000 MHz
VXI-3570A
2804-1000-25
VHF/UHF DSP Receiver, 20 - 3000 MHz, w/C40 Communications Port
VXI-3570A
2804-1000-26
VHF/UHF DSP Receiver, 20 - 3000 MHz, w/Internal Frequency Reference
Specifications subject to change without prior notice
Printed in U.S.A. Copyright 11/10
9333 Balboa Ave, San Diego, CA 92123
PHONE: 858.505.2024 FAX: 858.505.1593
www.cubic.com
An ISO 9001:2000 Certified Company
CCI-215c
11/10