You can hear Clover Sound.
NB6Z's"About Digital Modes Page"
Hardware and original Software of HAL Communication Corp. (From Home Page).
For more information, please look at following URL. (Please contact directly for details)
Home Page is as follows (Updated 11-May-98),
HAL Corp. Home Page dated 11-May-98
HAL PCI-4000/2K HF MODEM
Now you can send error-free data at high data rates over high frequency (HF) radio links. The HAL PCI-4000/2K modem plugs into your computer and gives you the highest performance possible when running CLOVER-2000 data mode. Installation and connection to your radio equipment is simple with the included software, cables, and user-friendly interface. Sending data via HF radio is not a simple task. Ionosphere conditions constantly change, often causing distortion and errors in the received data. CLOVER-2000 mode continuously measures the actual parameters of the received signal and adjusts the transmitted signal to compensate for these inescapable problems. Whatever the conditions, CLOVER-2000 adapts to give you the highest error-free data rate possible. To assure interoperability with all other HF data radio stations, the PCI-4000/2K also includes the standard FSK data modes. Digital Signal Processing (DSP) in the PCI-4000/2K sets new standards for receive data recovery and transmit data purity when using these modes. Hear and work all of the signals - not just the loud ones. The PCI-4000/2K plugs into any PC-286 or higher personal computer, requiring one full-length I/O card slot. Complete software for all modes is provided with the PCI-4000/2K and a growing number of "3rd-party" PC-based programs are now available at little or no cost.
The P38 is a multi-mode HF data modem that gives you top performance operation using RTTY, AMTOR, P-MODE*, and CLOVER waveforms. The P38 is a full-sized plug-in card for PC-AT and faster personal computers. Multi-screen menu-driven HAL software is included with each P38 modem. Many popular "third-party" user programs are also available for the P38 - W0RLI, WINLINK, XPPCI and WF1B, for example. The P38 is complete and ready to run. Plug-in the board, connect three phono cables (not included) to your radio, and install the software -that's all there is to it!! Whether you want to rag-chew, chase DX, or contest, the P38 is the modem of choice. P38 SPECIFICATIONS CLOVER-II Format 4-tone emission Bandwidth 500 Hz @ -50 dB ARQ Mode Modulation BPSM, QPSM, and 8PSM FEC Mode Modulation 2DPSM, BPSM, QPSM, and 8PSM Tones 2250 Hz Center Symbol Rate 31.25 per second Error Correction Coding Reed-Solomon code: 60, 75 or 90% code rate ARQ Protocol 2-level, multiblock auto adaptive modulation Adaptive Mode Control Measure S/N & Phase on all data, set TX Mode ARQ Thru-put 8 to 35 bytes/second FEC Thru-put 4 to 25 bytes/second FSK Rtty Codes Baudot and ASCII ASCII Codes 45, 50, 57, 75 Bd RTTY Tones 1275/1445 or 2125/2295 Hz AMTOR Code CCIR-476 & CCIR-625 AMTOR Modes ARQ or FEC AMTOR Tones 1275/1445 or 2125/2295 Hz AMTOR Rate 100 Baud P-MODE Modes Auto-ARQ & FEC P-MODE Rates 100/200 Baud HARDWARE Circuit Board Full-size for PC-AT DSP Processor TI TMS320C25-50 Control Processor Motorola 68EC000 Analog I/O TI TLC320AC01 14-bit Codec Memory Boot EPROM; RAM loaded from PC PC Interface PC-AT ISO Bus PC Address 200 to 3FF Hex PC Requirements PC-286 Minimum '386 or '486 preferred Radio Performance Tune in 10 Hz steps, +/- 15 Hz stability Radio Connection RX Audio, TX Audio, PTT, FSK, SEL-CAL Radio Connectors Phono and Mini-phone SOFTWARE HAL Software Included with the P38 Software Updates Code loaded from PC hard disk. Updates available from Web page or dialup BBS (217)367-7373 3rd Party Software For more information click on one of the following: EXPRESS, Rag-Chew, WINLINK, W0RLI, WF1B , XPPCI . *The word "P-MODE" is the HAL designation for a communications protocol that may also be known as "Pactor", a registered trademark of the Spezielle Communications Systeme GmbH (SCS) firm in Hanau, Germany. HAL affirms that, to the best of its knowledge, "P-MODE" is compatible and interoperatable with the protocol SCS calls "Pactor" and with the link establishment and weak signal modes of the protocol SCS calls "Pactor-II".
The DSP4100/2K is an HF data modem that provides CLOVER-2000, a 2000 bits/sec., voice bandwidth, adaptive waveform specifically designed for HF radio data communications. CLOVER-2000 measures real-time HF signal conditions and sets the most efficient modulation for these conditions. 8-bit data is sent without extra manipulation or modification. ARQ mode is simultaneously bi-directional (duplex) and does not require an "OVER" command. FSK waveforms CCIR-476/625 "TOR", P-MODE*, Baudot and ASCII are included. Housed in an RF-tight shielded enclosure, the DSP modem operates on 10 to 18 volts DC. Internal modem software can be uploaded into the DSP4100/2K into non-volatile "flash memory", greatly simplifying addition upgrades. The DSP4100/2K is particulary well suited for use with lap-top terminals (PC's) in a portable and/or field enviroment. Many "third party" software packages are available. DSP-4100/2K SPECIFICATIONS CLOVER 2000 Format 8-bit transparent Bandwidth 2000 Hz (500-2500 @ -50 dB) ARQ Mode Modulation BPSM, QPSM, 8PSM, 8P2A, 16P4A FEC Mode Modulation 2DPSM, BPSM, QPSM, 8PSM, 8P2A, 16P4A Tones 1500 Hz Center Symbol Rate 62.5 per second Error Correcting Coding Reed-Solomon code: 60, 75, or 90% Code Rate ARQ protocol 2-level, multiblock auto adaptive modulation Adaptive Mode Control Measure S/N & Phase on all data, set TX mode ARQ Thru-put 28 to 250 bytes/sec. 224 to 2000 bits/sec. FEC Thru-put 14 to 167 bytes/sec. 112 to 1336 bits/sec. FSK MODES FSK Tones 500-3000 Hz, programmable TTY Codes Baudot and ASCII TTY Rates 45, 50, 57, 100, 110 Baud TOR Codes CCIR-476 & CCIR-625 TOR Modes ARQ, FEC, SEL-FEC TOR Rate 100 Baud P-MODE Modes Auto-ARQ & FEC P-MODE Rates 100/200 Baud HARDWARE Cabinet Extruded 5.7x9.6x1.7 inch DSP Processor Motorola DSP56001 Control Processor Motorola 68EC000 Analog I/O TI TLC-320AC01 14-bit Codec Memory Flash RAM loaded via serial I/O I/O Interface Serial RS-232 9.6 kbps Power Input 10 to 18 VDC, .25 A Indicators STBY, Call, Link, Error, TX, RX Radio Performance Tune in 10 Hz steps; +/-50 Hz stability Radio Connections Rx Audio, TX Audio, PTT, FSK, SEL-CAL 2nd serial I/O Radio Connector DE-9S SOFTWARE HAL Software Included with DSP4100/2K Software Updates DSP & 68000 code uploaded via serial I/O Option DSP-4100 w. CLOVER-II 500Hz BW Mode Warranty One Year Parts and Labor