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- 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
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- 2/94