The search returned 4 articles:

  1. March 2007: Project: GPS-Based Frequency Reference; Pt.1 by Jim Rowe, PCBs: SC 04103072/04103073, EPE 706/707, 5 shop items [print issue] [online issue]
  2. April 2007: Project: GPS-Based Frequency Reference; Pt.2 by Jim Rowe, PCBs: SC 04103072/04103073, EPE 706/707, 5 shop items [print issue] [online issue]
  3. May 2007: Project: GPS-Based Frequency Reference: Circuit Modifications by Jim Rowe, PCBs: SC 04103071/2, EPE 706/707, 5 shop items [print issue] [online issue]
  4. September 2011: Project: Improving The GPS-Based Frequency Reference by Jim Rowe, PCBs: SC 04103072/04103073, 11 shop items [print issue] [online issue]