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.
  2. The G4ILO WSPR page documents 144.490 MHz as the preferred 2 meter WSPR frequency in 2008.
  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.
  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).
  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.
  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.