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

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

Here are a few points to consider in resolving the issue of potential interference with ARISS voice uplink operations in the 2 meter WSPR frequency segment outside of IARU Region 1:

  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 should follow the lead of Region 1 rather than expect Region 1 to change its established band plan.
  4. Although IARU Region 2 (the Americas) currently lacks a VHF band plan, this is an agenda item for the IARU Region 2 General Assembly scheduled for September 2013. A good case may be made for 2 meter WSPR activity in Region 2 to continue in the current WSPR frequency segment of 144.4905 MHz.
  5. Since June of this year, WSPRnet statistics would 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 that it regularly uses for scheduled voice operations. Therefore, it would seems logical that the ISS is more conveniently able to operate outside the 2 meter WSPR segment.

I believe that this matter can be reasonably and expediently resolved between AMSAT and WSPRnet to allow the continued operation of both ARISS and WSPR network stations on the 2 meter band.