ST-135

Software Radio Demodulator

for demodulating diverse signals

Ordering Information

• Demodulates BPSK,

DBPSK, QPSK, DQPSK,

OQPSK, MSK, and FSK

• PSK symbol rates from

1.2 kS/s to 16 MS/s

• FSK symbol rates from

1.2 kS/s to 500 kS/s

• Phase estimator assisted

TDMA burst acquisition

• Tuning resolution of 1 Hz

TCP/IP interface

• NT device drivers

• TDM, TDMA, Push-to-Talk,

SCPC

• Matched filter CDMA

spread spectrum RX (opt.)

• FEC decoder (opt.)

Features

www.sigtek.com

9075 Guilford Road, C-1 • Columbia, MD 21046 • 410-290-3918 • 410-290-8146 fax

Soft decision bits:

RS-422 and VME P2

X-Y constellation:

SMA, high impedance scope

INPUT

OUTPUT

Signals:

BPSK, DBPSK, QPSK, DQPSK, FSK, and MSK

Rates:

PSK from 1.2 kS/s to 16 MS/s

FSK from 1.2 kS/s to 500 kS/s

Burst acquisition:

Phase estimator assisted

Carrier error tracking:

5% of symbol rate

DEMODULATION

A member of Filtronic Sigtek’s high performance VME software radio family, the

ST-135 high performance software radio demodulates a growing set of signals

including BPSK, DBPSK, QPSK, DQPSK, FSK and MSK. Bit rates from 1.2 Kbps

to 32 Mbps with future growth to 40 Mbps and beyond. The expandable software

radio architecture allows addition and enhancement of demodulation types.

operation and NT device drivers. Options include a direct sequence CDMA

spread spectrum receiver and FEC decoder.

ST-135-xxx Burst Demod

-000 : Analog input

-ECL : ECL input

-DMF : CDMA option

-FEC : FEC option

*Chassis are available upon request

001-0135-700 Rev. 1

Analog

Tuner/ADC

Digital Down

Converter

CDMA

Despread

(optional)

FEC

Capture

(optional)

Bit

Mapper

Digital

Demod

Carrier

NCO

Symbol

NCO

Analog

IF

I

Q

I and Q

Capture

Soft

Decisions

Analog

Tuner/ADC

Digital Down

Converter

CDMA

Despread

(optional)

FEC

Capture

(optional)

Bit

Mapper

Digital

Demod

Carrier

NCO

Symbol

NCO

Analog

IF

I

Q

I and Q

Capture

Soft

Decisions

ST-135 Software Radio Block Diagram

IF:

120 to 200 MHz 45 to 95 MHz (optional)

Level:

-10 to -60 dBm

External Reference:

10 MHz

Connector:

SMA, 50 ohm

FEC Decoder/Capture (optional)

Viterbi FEC:

1/2, 3/4, and 7/8 with constraint length 7

Capture buffer:

2 Msamples x 16-bit I and Q

Direct Sequence CDMA Spread Spectrum Receiver (optional)

Signals:

BPSK and QPSK

Chip rates:

1 MHz to 16 MHz

Sequence Length:

Acquisition:

1024 length, matched filter assisted,

serial despreader

ST-135 VME Card

Double width VME: 6U x 160mm