HAM Title
Rule Title
LAST UPDATED: Oct.17, 2012

 We provide technical information only to those who comply with the following term. Please read this term carefully before downloading technical information. If you have any questions, please contact us.

Available Condition

 HAM Radio Service is available only when all of the following conditions are fulfilled.
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Message box Specifications and Limits

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Message Formats

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Procedures of HAM Radio Service

  1. Setup of the Ground Station
      Prepare the ground station capable of CWE downlink, FM packet downlink, and FM packet uplink.
  2. Careful Reading of Term and Getting Information
      Read the term carefully. If you agree to obey the term, technical information is disclosed to you.  Technical information contains uplink frequency, command formats, and so on.
  3. Confirmation of Service Availability and Expected Satellite Orbit
      Check the availability and get the orbit information.  The information is provided in the following page.
    State of HAM Radio Service
  4. Health Check of Ground Station and PRISM
      When PRISM get into your ground station’s range,  confirm that PRISM is sending CWE beacon and your ground station adequately receiving the signal  in CWE mode.
  5. Confirmation of No Uplinking Ground Station
      After you successfully hear beacon signals,  change the ground station mode to FM and confirm that there are no other operators sending commands.  If you do not receive PRISM’s FM downlink for more than 15 seconds, this condition is cleared.
  6. Health Check of FM Packet Uplink
     Firstly, send an Information Command to PRISM and check the health of both uplink and downlink of FM Packet. PRISM replies approximately 4 seconds after receiving commands. So, do not send commands for 5 seconds after sending the previous command.
  7. Registration and Downlink of Messages
     After you confirm the current message ID, uplink write commands or read commands. If the message ID is over 98. Do not send write command.
     Note: After you send Write Command, use the Information Command  to confirm the registration. Do not continuously uplink write commands.
  8. Operator Change
     After you write and downlinked the message, please wait for more than 15 seconds for other potential main operators. Although Information Commands and Read Commands can be uplinked continuously, please pay attention to the other operators.
The procedures are also shown in the following block diagram.
HAM Flow
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Main Operator Rotation

 Here, a main operator means an operator uplinking commands to PRISM. Because this service allows only one operator at a time, please take turns to uplink commands. Following are the condition to change main operator rotation and start uplinking.
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Possibility of Term Change

 The term of PRISM HAM Radio Service may be changed without prior notice. ISSL will inform the change at Staet of HAM Radio Service page. If you notice the change of term, be sure to read this term thoroughly and use HAM Radio Service.
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Prohibition of Disclosing Technical Information to the Third Party

 If you agree to follow this term thoroughly, we will provide you with technical information in the next page. The information on the next page should not be reprinted or disclosed to the third party without explicit official permission from ISSL. Also, this service is provided AS IS, and without any warranty expressed or implied as to its accuracy or its completeness, ISSL denies any liability regarding your operation.
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Agree to the term

 If there are some people who violate this term and the act may disrupt PRISM or PRISM’s operation, we might stop all HAM Radio Service by disabling receiver module concerning HAM Radio Service. This is for PRISM’s safety. In order to maintain HAM Radio Service, please follow this term. We appreciate your cooperation.