0SAREX PAYLOAD DESCRIPTION AND MISSION OVERVIEW [Ed. Note: This information is provided by the American Radio Relay League's Educational Activities Department] This section contains a general payload description and a mission overview. Payload Description Configuration A - SAREX configuration A (see description of apparatus, below) consists of a suite of amateur radio equipment, much of which was flown previously on STS-51 F and STS-9. Configuration A is comprised of a low power handheld Frequency Modulation (FM) transceiver, a spare battery set, an Interface (I/F) module, an SAREX headset assembly, an equipment assembly cabinet, a Television (TV) camera and monitor, a Payload General Support Computer (PGSC) and an antenna capable of being mounted in one of the Orbiter's flight deck windows. The equipment assembly houses power supplies, a Slow Scan Television (SSTV) converter, and a packet radio Terminal Node Controller (TNC). SAREX configuration A is capable of communicating with amateur radio stations within Line Of Sight (LOS) of the Orbiter in any one of three modes, e.g., voice, SSTV or data. In the latter two modes, the equipment can be operated either attended or unattended. In the attended method of operation, the operator manually provides the equipment with TV pictures (using the TV camera) or computer data (using the PGSC keyboard) and observes the TV picture on the monitor or printed text via the PGSC screen. In the unattended method of operation, the operator turns the equipment on and attends to other duties occasionally observing the SAREX equipment operation. The function of each of the SAREX configuration A equipment suite is summarized as follows: a. Handheld transceiver - Receives and transmits FM voice, SSTV or packet radio signals in the two meter (144 to 146 MHz) Amateur Band. b. I/F module - Serves to provide a means of interconnecting the SAREX equipment with the standard crew microphone/headset or the SAREX headset assembly and standard crew personal tape recorder. The I/F module also interconnects the handheld transceiver with the equipment assembly cabinet. c. Equipment assembly cabinet - Houses the SSTV converter, packet radio TNC, power supplies and switches, displays and connectors. 1. SSTV converter - Takes normal TV from the camera or Shuttle TV distribution system and makes still pictures which can be transmitted in a voice bandwidth radio circuit and takes still TV frames transmitted up on a voice bandwidth radio circuit and converts them for viewing on a standard TV monitor. 2. Packet TNC - Interconnects a computer with a radio transceiver so that data to and from the computer is transmitted to and received from other stations in bursts of characters using a special Amateur Radio developed protocol. This protocol includes error correction and station addressing features. d. TV camera - Allows scenes in the Orbiter as well as external scenes available through the various windows to be televised and sent to the SSTV converter. e. TV monitor - Allows viewing of TV pictures from the SSTV converter. f. Antenna - Permits the radio signals to and from the handheld transceiver to be transmitted and received through one of the Orbiter's windows while limiting the leakage of radio frequency (RF) energy into the cabin. g. PGSC - Serves as a data terminal for the packet radio portion of the experiment. Configuration B - SAREX configuration B consists only of the handheld transceiver, I/F module, spare battery set, SAREX headset assembly, personal tape recorder, and the window antenna. It is capable only of exchanging voice communications with amateur stations within LOS of the Orbiter. Configuration B can be operated only in the attended mode. Configuration C - SAREX configuration C consists of the handheld transceiver, I/F module, PGSC, spare battery set, window antenna, packet module, SAREX headset assembly, personal recorder, and the required cable assemblies. The packet module contains a power supply and packet TNC. The power supply provides power for the TNC and the handheld transceiver. The TNC interconnects with a radio transceiver so that data to and from the computer is transmitted to and received from other amateur radio stations. Configuration C is capable of operating in either the voice or data mode in communications with amateur stations within LOS of the Orbiter. This configuration can be operated in the attended mode for voice communication and either the attended or automatic mode for data communications. Configuration D - SAREX configuration D is the same as configuration A except that a Fast Scan Television (FSTV) module is added to the antenna assembly. The FSTV module contains a receiving RF preamplifier and a video decoder that provides NTSC video for SAREX. This configuration communicates with amateur stations within LOS of the Orbiter in one of four modes, e.g., voice, SSTV, data, or FSTV. The voice mode is operated in the attended mode while SSTV, data, or FSTV can be operated in either the attended or unattended mode. Configuration E - SAREX configuration E is virtually identical to configuration D, except that instead of using the VCR/Monitor normally provided, the Shuttle provided Video Interface Unit (VIU) is used in place. In this configuration, video from the FSTV or SSTV is viewed on color monitor in the orbiter. This modification results in a 50% reduction in SAREX payload weight. Mission Overview Integrated Ground Operations.- After the payload is initially prepared, it is transported to the Orbiter integration facility. The payload is installed in the Orbiter at the launch pad. Flight Operations.- Operation in-flight will be limited to usage during off-duty hours by crew members who have Amateur Radio licenses. Postlanding.- After landing, the payload is removed from the Orbiter and returned to the customer at JSC. MISSION OPERATIONS:- The mission operations section includes a definition of requirements and constraints. Payload Control Parameters The payload control weight and payload control dimensions define the maximum weight and dimensions of the payload for NSTS (National Space Transportation System) mission planning purposes. A payload may not exceed its control weight or control dimensions without NSTS approval. The payload control weights are as follows: Configuration A 60 lb (27.21 kg) Configuration B 35 lb (15.90 kg) Configuration C 45 lb (20.41 kg) Configuration D 70 lb (31.75 kg) Configuration E 35 lb (15.90 kg) - approx. All configuration A and D payload equipment, except the window antenna, will be stowed in one and one half middeck locker volumes. The window antenna will be stowed in the Orbiter window shade bag. All configuration B and C payload equipment, except the window antenna, will be stowed in one half locker volume. The window antenna will be stowed in the Orbiter window shade bag. For configurations A, C, and D a PGSC can be used to provide the middeck SPOC (Shuttle Payload Operations Contractor) function which would eliminate the requirement to carry a second SPOC. In this configuration SAREX would be operated on a non-interference basis with SPOC requirements. Operational Requirements and Constraints The following payload operational requirements and constraints will be used in the flight planning and implementation of the STS/payload mission. Requirements that impose flight design and/or crew activity constraints will be implemented to the extent practical within primary payload objectives or mission objectives as determined by the NSTS. Launch Readiness - Prelaunch Constraints: The payload will be in final lift-off configuration when installed in the Orbiter. At this time, the payload will be capable of sustaining this configuration indefinitely without access or NSTS support. Launch Commit Criteria: The payload will not constrain launch. On-orbit.- All SAREX operations will be conducted in the 2 meter (144 to 146 MHz) band utilizing FM. Operating times for the SAREX payload will be such as to not interfere with any other planned mission activities. The payload operating times will be logged via the standard crew personal tape recorder or the PGSC, as appropriate. The customer will identify the desired ground locations expected to be used for SAREX payload operations prior to the flight. SAREX.2 2/94