HAL COMMUNICATIONS CORP.

Government & Commercial Products Division

1201 W. Kenyon Road
P.O. Box 365
Urbana, IL 61801-0365
ST-8000A
Phone: (217) 367-7373 FAX: (217) 367-1701

ST-8000A HF MODEM
The ST-8000A is a high performance modulator-demodulator (MODEM) that is an interface between digital
data signals and radio or wireline transmission systems. The modulator section of the ST-8000A converts digi-
tal data pulses into audio tones. The frequency of the output tone is shifted according to the MARK or SPACE
state of the data pulses. This frequency-shift-keyed (FSK) output signal is used to drive data transmission lines
or as an audio input to a radio transmitter. The ST-8000A demodulator section converts FSK audio tone data
from a radio receiver or wireline into digital pulses that are then used to drive a data terminal device. The
National Stock Number of the ST-8000A is 5895-01-331-6220ZS.

Modulator and demodulator parameters of the ST-8000A are set The ST-8000A remote control input port may be used with either
by front panel keypad entry or by using remote control com- an RS-232 or MIL-188 compatible terminal or computer at data
mands issued by a computer or controlling data terminal. rates from 110 to 38,400 baud. Remote control commands
Microprocessor control circuitry within the ST-8000A interprets include HELP messages and summary output features.
these user inputs and generates the required control signals to the
modulator and demodulator sections of the modem. The modem
may be operated in either "full-duplex" (FDX) or "half-duplex" The ST-8000A is housed in a rack-mountable aluminum cabinet.
(HDX) modes. The cabinet is 3.5 inches high by 19 inches wide by 18 inches
deep. The modem may be operated from power line sources of
115 VAC +/-10% or 230 VAC +/-10% at frequencies from 47 to
The ST-8000A front panel includes a 27-key keypad for param- 440 Hz. The modem requires a total of 30 Watts of AC power.
eter entry, numerical digital displays, and LED mode indicators.
The MARK, SPACE, and CENTER frequencies are displayed to
0.5 Hz resolution and may be set in 0.5 Hz increments from 300 The ST-8000A meets U.S.A. (UL-1950) and European (EN 60
to 3000 Hz. Baud rate is displayed to 1.0 baud resolution and 950) safety testing requirements and FCC (U.S.), VDE
may be set in 1.0 baud increments over the range of 30 to 1200 (Germany), and BSI (United Kingdom) requirements for RFI
baud. LED indicators show currently selected operating modes. suppression. The design Mean-Time-Between-Failure (MTBF)
Two 20-segment Bar Graph displays show the amplitude of the of the ST-8000A is greater than 30,000 hours. The ST-8000A
MARK and SPACE signals of both the modulator output and may be operated over the temperature range of 0 to 50 degrees C,
demodulator input audio signals. up to 95% humidity (non-condensing), and up to 10,000 ft. elevation.
 ST-8000A HF MODEM
SPECIFICATIONS

DEMODULATOR: FRONT PANEL:

Input Impedance: 600 ohm or 10,000 ohm, +/-10%, Balanced; impedance Data Entry Keys: 27 Key keypad, functions are: 0.5, 0 through 9, ENTER,
set by internal jumper option. M/S-CENT, BIT, 2nd, FSK, MARK ONLY, SPACE ONLY,
Input Level: -45 dBm to +6 dBm into 600 ohm. DIV, MUTE, REMOTE, AMH HOLD, NORM REV,
Data Rate: 30 to 1200 baud, in 1.0 baud increments. SYNCH REGEN, CHAN, BAUD RATE, CLEAR.
Frequency: 300 to 3000 Hz, in 0.5 Hz increments. Indicators: Keypad annunciators on ENTER, DIV, MUTE, and
Frequencies Set: MARK and SPACE or CENTER and SHIFT. REMOTE keys. LED annunciators for DEMOD, MOD,
Shift: 30 to 2700 Hz, 30 to 600 baud, 1 Hz incr. 850 to 1200 MARK, CENTER, SPACE, SHIFT, SYNCH, FSK, RECEN,
Hz, 601 to 1200 baud, 1 Hz incr. MK ONLY, SP ONLY, AMH, HOLD, and REV.
Filter Bandwidth: 16 MARK and 16 SPACE bandwidths automatically Frequencies: RED LED displays as follows: 5-Digit for MARK/CENTER;
selected according to data rate selected. 5-Digit for SPACE/SHIFT; 4-Digit for BAUD; l-Digit for
Detection: MARK Only, SPACE Only, or MARK/SPACE detection. CHANNEL.
Mark Hold: Returns output RXD to MARK state when signal is not Signal Level: Two 20-segment RED LED Bar Graphs, calibrated from -42
present. Threshold = -42 to 0 dBm, 6 dB incr. Delay = dBm to +6 dBm (600 ohm reference).
1.0 to 5.0 seconds, 0.5 sec. incr. Set via internal option Other Controls: POWER: AC power to ST-8000A; OUTPUT LEVEL:
switch. Continuous adjustment of Modulator output level.
Low/High Speed: Two separate demodulators and detectors; Low-Speed = Memory: Previous parameters are restored on power-ON.
30 to 600 baud; High-Speed = 601 to 1200 baud.
Automatically selected according to data rate. REMOTE CONTROL:
Receive Data Out: EIA RS-232C and MIL-STD-188C (on separate pins) Data Format: RS-232 or MIL-188 jumper selectable. ASCII for-mat:
Data Sense: Selectable NORMAL or REVERSE. 1 Start, 8 Data, 2 Stop bits.
Carrier Detect: RS-232 or MIL-188 output, by internal jumper. Data Rate: 110, 300, 600, 1200, 2400, 4800, 9600, 19,200, or 38,400
Receive Clock: RS-232 Mid-Bit Regen. Clock, 30 to 1200 baud. baud (internal switch).
Synchronous Mode: RS-232 and MIL-188, 30 to 1200 baud. Unit Address: Select Unit1 through Unit 9 (internal switch).
Asynchronous Mode: RS-232 and MIL-188 for 5, 6, 7, and 8 bit data codes; set Multi-Modem: Up to nine ST-8000A Modems may be "daisy-chained” to a
via front panel or Remote Control. single remote control terminal.
BIT Loop-back: Internal Built-In-Test (BIT) loop-back of Modulator Commands: All Front Panel features (except OUTPUT LEVEL and
signal into Demodulator input; BIT levels = 0 dBm, -20 POWER ON) can be set by REMOTE commands.
dBm, and -45 dBm.
Diversity Option: OPTIONAL FEATURE: Connects two ST-8000A FSK REAR PANEL CONNECTIONS:
Modems for two-receiver combination diver-sity.
Requires OPTION 01. DATA I/O: MS27508E14F35SB MIL connector.
AUDIO I/O: MS27508E14F35SA MIL connector.
MODULATOR: REMOTE: MS27508E10F35P MIL connector.
Output Impedance: 600 ohm +/-10%, balanced. DIVERSITY: Optional MS27508E10F35S MIL connector, requires
Output Level: -35 dBm to 0 dBm into 600 ohm; set via Front Panel Diversity Option-01.
adjustment. AC POWER: IEC 320 power connector; MS27472E12F98P MIL connector
Data Rate: 30 to 1200 baud in 1.0 baud increments. to IEC 320 adapter cable is provided.
Modulation: FSK as defined in MIL-STD-188C (2.347 & 4.5.15) and
MIL-188-110A (5.2.1, 5.2.2, & 5.3.1.3). PHYSICAL DATA:
Harmonics: All harmonics < -40 dBm, referenced to 0 dBm output Cabinet Finish: Front Panel: Light Gray. Cabinet: Natural aluminum iridite
signal. finish.
Spurious Signals: All non-harmonic spurious outputs < -60 dBm. Cabinet Style: 19” rack mounting; rack handles included.
Frequency: 300 to 3000 Hz in 0.5 Hz increments. Size: 3.50” High x 18.0” Deep x 19.0” Wide (8.9 cm x 45.7 cm x
Shift: 30 to 2700 Hz in 1.0 Hz increments. 48.3 cm).
Frequencies Set: MARK and SPACE or CENTER and SHIFT. Weight: 16 lbs (7.3 kg) net, 28 lbs (12.8 kg) shipping.
TXD Mute: Turns Modulator output tones OFF. MUTE may be AC Power: 115 VAC +/-10% or 230 VAC +/-10%, 47 to 440 Hz; 30
selected by internal option jumper to turn output tones Watts. AC voltage and freq. switch selectable.
OFF from 0.000 to 9.999 seconds after input TXD has AC Protection: Rear panel fuse, 0.5 Amps, slow-blow.
ceased.
Transmit Data In: 30 to 1200 baud; RS-232 or MIL-188; selected via COMPATIBILITY:
internal option jumper. Interoperability: Operationally and plug-compatible with 1280A/M;
Transmit Clock: Provides synchronous transmit clock for data ter-minal Communications compatible with MD-1232G (ST-8000) and
devices. RS-232, 30 to 1200 baud; clock frequency = other FSK Modems.
selected data rate. Safety: Meets UL 1950 and EN 60 950.
Data Sense: NORMAL or REVERSE. RFI: In accordance with FCC Part 15 (Class A), VDE/TUV
Keyline Output: Isolated relay contact output for control of (Germany) and BSI (United Kingdom).
transmit/receive function (PTT). Environment: Operational: 0 to 50 degrees C, 95% Relative Humidity (non-
condensing); Sea level to 10,000 ft. Non-operational: to
Specifications subject to change without notice. 50,000 ft.
CAGE CODE: 63256 Reliability: Design MTBF >= 30,000 hrs. (MIL-HDBK-217E).
HAL COMMUNICATIONS CORP. Warranty: One year from date of purchase.
Government & Commercial Products Division
1201 W. Kenyon Road OPTIONS:
P.O. Box 365 Option 01: Diversity Option - Allows connection of two ST-8000A's in
Urbana, IL 61801-0365 combination diversity operation.
Phone: (217) 367-7373 FAX: (217) 367-1701 Loop Supply: LP-1200A (1 channel) or LP-1210 (10 channels).