Marta Systems, Inc. DSPix7 Weather Data Acquisition PC Card

DSPix7 Digital Signal Processing Board

Marta Systems' DSPix7 high-speed signal processor board was designed especially for demanding imaging and telecommunications work. This single, full-sized IBM-AT compatible card is configurable for either one (single channel) or two (dual channel) full-duplex analog channels with subscriber-line interfaces, two serial channels capable of operation up to 4mbps, one serial channel which can operate up to 5mbps, two general-purpose digital inputs, 64k bytes of local memory, a 16-bit bus-master interface to the PC-AT bus and a second-generation Texas Instruments DSP running at 40 MHz.

The unique bus-master interface on the DSPix7 allows direct reading and writing of data anywhere within the 16 megabyte address space of the PC without any intervention by the PC. Onboard diagnostics and system monitor speed program development and quickly pinpoint faults while in operation.

Typical DSPix7 applications include domestic and international wire service and satellite image reception and transmission. DSPix7 custom application drivers have been written to support CCITT, AP, UPI, GOES-TAP and GOES, METEOSAT and GMS WEFAX formats. DSPix7 cards include a debug monitor code to allow development of custom application drivers. Applications include:

IMAGING:

Weather picture simultaneous transmission and reception.

Image Standards conversion (AM to FM and/or FM to AM).

Wire Photo transmission and/or reception.

High-speed Facsimile transmission and reception.

TELECOMMUNICATIONS:

T-1 "drop and insert" dual-channel unit.

Packet-radio modem.

GENERAL SPECIFICATIONS:

DSP - Texas Instruments TMS32025, 40 MHz.

Memory - 64k bytes, 35ns no-wait static ram

I/O Pins - 2 general-purpose TTL-level inputs

Serial Interface:

Channel 1: Sync/Async, 4 mbps, RS-232 (Channel 'A' of Z8530)

Channel 2: Async, 4 mbps, RS-232 (Channel 'B' of Z8530)

Channel 3: Codec/Async/Sync, 5 mbps, TTL (DSP On-Chip)

Analog Interface (2 channels option):

12-bit A/D and D/A, accurate +- 1/2 bit

TECHNICAL SPECIFICATION (each channel):

Connection: 3002 Leased Line or RJ-11 dial-up

Impedance: 600 ohms balanced

Serial Data Interface:

Channel 1 - Sync/Async, RS-232, 4 mbps (Channel 'A' of Z8530)

Channel 2 - Async, RS-232, 4 mbps (Channel 'B' of Z8530)

Channel 3 - Sync/Async/Codec, TTL, 5 mbps (DSP on-chip port)

Image Resolution: up to 3,333 pixels per line (programmable)

Nominal Input Level: 0 dbm

Input AGC Range: +10 to -33 dbm (selectable range)

Output Level: -7dbm nominal (transmit option only)

Line Rate	Modulation	Carrier Frequency
CCITT - 60/120 LPM	DSB, AM or FM	1300 Hz +-5%; 1800 Hz +- 5%, AM
AP - 144 LPM	VSB, AM	2481.5 Hz +-5%, AM
UPI - 120 LPM	VSB, AM or FM	2448 Hz +-5%, AM
WEFAX - 240 LPM	VSB, AM or FM	2400 Hz +-5%, AM
GOES - 120 LPM	VSB, AM or FM	2400 Hz +-5%, AM

3 db Video Bandwidth Modulation Depth (AM)

CCITT - 1200 Hz	33 db
AP - 2000 Hz	22 db
UPI - 2000 Hz	20 db
WEFAX - 1600 Hz	26 db
GOES - 1600 Hz	26 db

NOTES:

1. DSPix7 Digital Signal Processor cards are available with one or two channels.

2. Specifications are subject to change without notice.

3. One year limited warranty.

4. No user serviceable parts onboard.

Picture of DSP two Channel transmit and receive

Picture of DSP two Channel receive

Picture of DSP single Channel receive