High Frequency Single Sideband Communications Systems 924 HF fax system Fax over HF radio The Barrett 924 Fax system is a simple and reliable hard copy data transfer system for high frequency radio network requiring minimal system setup and operator training. The Barrett 924 HF Fax system is ideal for providing fax connections between sites that have no connection to telephone systems. An HF Fax station consists of a Barrett 950 transceiver and 924 modem, a suitable power supply and antenna and an inexpensive standard fax machine - No computer or expensive software is required. Operators simply establish a radio link by voice, selcall or ALE, put the documents to be transmitted to the distant station in the fax machine and dial in the remote stations number - the system takes care of the rest. When the Fax has been received by the remote station an acknowledgment is printed on the local fax just as it would when using a fax connected to a telephone line. System setup is simple - enter the HF network frequencies into the transceiver and enter the station's radio call identification number through the fax keyboard. The system is ready to send faxes. Integrated into Barrett Communication's standard equipment enclosure, the 924 Fax modem uses a standard bus cable to connect it to a Barrett 950 transceiver. For mobile operation the 924 modem operates with the Barrett 950 remote control transceiver and commonly available 12 volt fax machines. The system uses the robust and high speed Clover 2000 protocol to transmit the fax digitally and error free. With typical good HF conditions a standard page of text can be sent in less than 3 minutes. Slightly longer than a telephone fax but with no cost. For future expansion the Barrett 924 Fax modem also provides the same facilities as a Barrett 923 modem, connected to a computer running Barrett 923 operating software it provides computer to computer data transfer with Internet connection. Quality System Certified to ISO 9002 Registration No. 57114