APRS Store and Forward Information
APRS
Store and Forward
Information
1
3
April
2021
APRS-Digipeater
❏
Frequency/ baud rate: 145.825 MHz/ 1200 baud
❏
Aliases: APRSAT, ARISS, WIDE
❏
Beacon interval: 45 seconds
❏
Beacon text message:
NOTE: Will announce once APRS payload is
activated.
APRS-Digipeater
❏
When sending message to satellite APRS payload:
❏
Use satellite ID
❏
Limit message to 50 characters
❏
ACK message should be received
SFward - Store and Forward Mission
❑
SFward aims to demonstrate the ability to collect data/messages
from Amateurs via the APRS protocol
❑
To prove the concept, amateur operators and satellite owners
may access the satellite via VHF and save their data in a
dedicated slot of the mission’s memory. The collected data is
downlinked using the UHF link.
❑
SFward follows the message format of APRS protocol.
❑
The collected SFward messages would be published to the
BIRDS Project website once downloaded from the satellites.
SFward - Usage Guidance
❏
SFward Microcontroller saves all received APRS packets. Thus
it can be used as an amatuer mailing box.
❏
Uplink frequency is 145.825 MHz working only when APRS
payload is activated.
❏
Total available data size is 67 characters in each packet.
However, the first two bytes are reserved to identify the
SFward packets from the rest of the APRS packets.
❏
Packets -which their data part starts with “SF” letters- are
considered SFward packets (SF-packets).
SFward - Concept of Operation
Example message format: SF <insert message up to 65 characters>
Destination: JG6YMX/Y/Z (Japan, Philippines, Paraguay)
Amateur users
APRS
message
ACK
This information discusses the APRS Store and Forward mission, focusing on collecting data/messages from amateur radio operators via the APRS protocol. The SFward project showcases the ability to access satellites through VHF, save data, and downlink it using a UHF link. It outlines beacon intervals, message formats, and operational concepts for amateur users interacting with the satellite infrastructure. The project aims to demonstrate the feasibility of amateur radio communication through satellite systems.
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Presentation Transcript
APRS Store and Forward Information 13 April 2021
APRS-Digipeater Frequency/ baud rate: 145.825 MHz/ 1200 baud Aliases: APRSAT, ARISS, WIDE Beacon interval: 45 seconds Beacon text message: Satellite ID Satellite Message Tsuru JG6YMX hello! this is birdjp Maya-2 JG6YMY hello! this is birdph GuarniSat JG6YMZ hello! this is birdpy NOTE: Will announce once APRS payload is activated. 2
APRS-Digipeater When sending message to satellite APRS payload: Use satellite ID Limit message to 50 characters ACK message should be received 3
SFward - Store and Forward Mission SFward aims to demonstrate the ability to collect data/messages from Amateurs via the APRS protocol To prove the concept, amateur operators and satellite owners may access the satellite via VHF and save their data in a dedicated slot of the mission s memory. The collected data is downlinked using the UHF link. SFward follows the message format of APRS protocol. The collected SFward messages would be published to the BIRDS Project website once downloaded from the satellites. 4
SFward - Usage Guidance SFward Microcontroller saves all received APRS packets. Thus it can be used as an amatuer mailing box. Uplink frequency is 145.825 MHz working only when APRS payload is activated. Total available data size is 67 characters in each packet. However, the first two bytes are reserved to identify the SFward packets from the rest of the APRS packets. Packets -which their data part starts with SF letters- are considered SFward packets (SF-packets). 5
SFward - Concept of Operation Amateur users Example message format: SF <insert message up to 65 characters> Destination: JG6YMX/Y/Z (Japan, Philippines, Paraguay) 6
