Bulletins from the Pacific Packet Radio Society - page 143

specifications (e.g., AX.25 level 2, TAPR/AMSAT). There will be opportunity for various experiments with higher-level protocols. A mailbox protocol with memory management and friendly, efficient user interface will be provided.

The primary use of PACSAT will be for store-on-uplink, forward-on-downlink full-earth coverage. Secondary uses will be for direct (real time) signal regeneration, including bulletin broadcasts, group transmissions, telemetry, and user reconfiguration of the secondary communication mode.

Volunteer Efforts for PACSAT

The PACSAT idea has been mulling around in the heads of several people. This design phase is due to end by mid February, when the need to keep on a two-year deadline will force the design groups to keep working.

Most of the ground station hardware design effort to date has been spread over several groups:

- Tucson Amateur Packet Radio ( TAPR )
- Amateur Radio Research and Development Corp. ( AMRAD )
- with further assistance from a strong AMSAT group in New Jersey

Ground-side linking systems are being developed by all of the above groups, as well as with AMSAT groups in New England, the Pacific Packet Radio Society ( PPRS ) and others.

A number of the above groups are also working on modem technology for the bandwidth-efficient packet channels required. There also exists a group up at the State University of New York at Stony Brook. The possible candidate for best memory technology are being investigated by AMSAT-related organizations in Canada and the U.S.

Problems associated with protocols, spacecraft operating systems, spacecraft-ground communication and ground operating protocols have been looked by almost all of the above groups. There are also groups in Los Angeles, St. Louis and in Linkoping, Sweden.

Negotiations are underway to set up flight hardware design and fabrication, and groups in the United Kingdom and South Africa might assist in efforts.

(reprinted from the TAPR Packet Status Registrar #3, December 1982)


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