ARISS Voice Operation in 2 Meter WSPR Segment in IARU Regions 2 & 3

This is the current status for frequency sharing of ARISS and WSPR network stations within the IARU Region 2 meter band plan.

  1. WSPR activity has occurred on 2 meters since the inception of WSPR and will continue into the future. Joe Taylor K1JT mentions 2 meter WSPR activity in the Pacific Northwest as early as April 2008 when the WSPR program was first released. http://groups.yahoo.com/group/wsjtgroup/message/4727
  2. The G4ILO WSPR page documents 144.490 MHz as the preferred 2 meter WSPR frequency in 2008. http://www.g4ilo.com/wspr.html
  3. In the IARU Region 1 band plan, 94 nations (a majority of IARU member societies) have concurred on 144.4905 MHz (144.489 MHz dial) as the designated world-wide WSPR frequency on 2 meters. 2 meter frequency allocations in Region 1 are much more constrained than elsewhere as their band encompasses only 144-146 MHz. Therefore Regions 2 and 3 follow the lead of Region 1 as Region 1 has fewer options to change its established band plan. http://www.iaru-r2.org/wp-content/uploads/R1-VHF-UHF-Bandplan.pdf
  4. Effective 27 SEP 2013 IARU Region 2 (the Americas) VHF band plan designates 144.400-144.500 MHz as primary for CW, Digital Modes and Beacons. (Footnote 2 yields permissible use of 144.490 MHz for ISS FM Voice uplinks when required). http://www.iaru-r2.org/documents/explorer/files/Plan%20de%20bandas%20%7C...
  5. WSPRnet statistics indicate that 2 meter WSPR network activity has grown to account for probably over 99% of the current regular worldwide activity on 144.4905 MHz. https://picasaweb.google.com/lh/photo/z-JQdo2jRwePdiH_Os1LmNMTjNZETYmyPJ...
  6. By its nature and design, all WSPR network operation should occur within one 200 Hz segment on each band. On the other hand, the ISS has at its disposal several alternate 2 meter uplink frequencies outside the 2 meter WSPR segment that it regularly uses for scheduled voice operations.

Carol
KP4MD/6