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Summation Research continues its history
of advanced communications processors with the MD-4030
GMSK Digital Modem. Designed for integration with a variety
of RF transceivers, the MD-4030 provides cost effective
communications capability for licensed and non-licensed
narrow-band data
applications.
The MD-4030 is a low-cost solution for applications requiring
GMSK modulation and demodulation in a simple to use, easily
integrated module. The units meet the FCC narrow-band re-farming requirements
and feature:
Data rates up to 9.6
kbps. On-board buffering is provided for smooth
information flow.
Radio Control: The MD-4030
provides a control interface for typical RF transceivers
for programming and operational
control, keying, and carrier detect.
Auto-Transmit and Receive: Modems automatically manage
the flow of information for simulated full-duplex operation.
The transmitter is automatically keyed whenever the appropriate
amount of data is ready to be transmitted.
Simple Integration: The modem is provided on a single
small PCB for simple integration into RF transceivers.
The MD-4030 can be provided with a matching RF Transceiver
for UHF or VHF Land Mobile operation.
Specifications:
| Modulation |
GMSK
Modulation Index: 0.5 BT
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| Data Rate |
9600 baud
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| Performance |
Link Performance - < 10E-4 BER at 12 dB SNR in 25 KHz channel
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| Throughput Delay |
The first byte
of a transmitted message is output from the receiver
within 10 msec
after the programmable delay period
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| Data Interface |
Signal Types – RS-232
Protocols – Asynchronous, DCE
Data Rates – 1200, 2400, 4800, 9600, and 14400
Signals - TXD, RXD, RTS, CTS, and GND
Format – 8 bit characters, E/O/N parity, 1 or 2 stop bits
Configuration – Data rate, parity, and stop bits set via configuration
commands to the modem card
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| Radio Interface |
TX Audio – +/- 125 mVDC centered at 1.65 VDC
corresponding to – to + 5 KHz respectively
RX Audio – +/- 125 mV corresponding to + to – 5 KHz respectively
PTT– TTL signal to put radio in TX mode when low
CD – TTL signal indicating RX carrier presence when high
Power – unregulated DC power pass through (35 mA RX and 300 mA TX at +12
VDC and 2 Watt output)
Ground
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| TX Baseband Signal |
Can be calibrated for each radio
Calibrated settings include peak to peak level and DC offset
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| Data Processing |
Rate buffering – 255 byte TX/RX buffers
Data packetizing – Acquisition preamble/frame sync insertion
Selectable Protocol modes:
Burst mode - variable length from 1 to 255 bytes
Transparent mode – any length message
Data scrambling to improve minimum data transition density
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| Programmable Parameters |
Delay from CTS to PTT (0 to 255 msec)
Delay from PTT to Data Transmission (0 to 255 msec)
Transmit Audio Scaling Factor (0.0 to 1.0 in 0.0039 increments)
Transmit Audio Offset Control (0.0 to +/- 125 mVDC in ~61 uVDC increments)
Data Interface Baud/Parity/Stop Bit Selections
Receive Audio Waveform Invert or Not Invert
Receive Carrier Detect Processing Enable or Disable
Receive Acquisition Sensitivity Threshold
Receive Termination Guard Time (0 to 255 msec)
Receive Error Detection Enable or Disable, with retransmit count and backoff
Message Protocol Transparent or Packet
Dynamic or Static Addressing
Relay Operation Enable or Disable with Relay Site Addresses
Data Scrambling Enable or Disable
Programmable
Data Pattern for Transmitter Calibration
All programmable parameters stored in non-volatile memory to serve as power up
default configuration
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| Input Power |
+10 to +14 VDC (unregulated)
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| Power Consumption |
< 200 mA
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| Packaging |
Board size – 5.75 x 2.8 x 1.7 inches L x W
x H;
Excludes connectors, but includes transceiver
Connectors:
- User UART I/F – Female DB-9 – right angle mount from board edge
- Radio I/F – female DB-9 – connected from board via flexible ribbon
cable.
- Power – 2 pin terminal block – right angle mount from board edge
Indicators – green LED’s – right angle mount from board edge
- Power – illuminated when 12 VDC is present on board
- RX/TX Active – illuminated when PTT active to RF transceiver
Board includes mounting holes compatible with common VHF transceivers.
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