| Linux systems - x86 compact PC | 
  
  
      | 
    PC Pixie 
      x86 Intel Atom PC - 1 GB 
      Wheezy #1 3.2.81-1 [32-bit] 
      PPS from Garmin GPS 18 LVC 
      Clock & System jitter 
     | 
  
     Linux systems - Raspberry Pi cards | 
  
  
      | 
    Raspberry Pi #1 
      Raspberry Pi 2B, 512 MB 
      Wheezy 4.0.7+ #801 [32-bit] 
      PPS from GPS module 
      Clock & System jitter 
     | 
  
  
      | 
    Raspberry Pi #12 
      Raspberry Pi 3B, 1 GB 
      Buster 4.19.118-v7+ #1311 [32-bit] 
      PPS from GPS module 
      Clock & System jitter 
     | 
  
  
      | 
    Raspberry Pi #13 
      Raspberry Pi 3B, 1 GB 
      Stretch 4.19.66-v7+ #1253 [32-bit] 
      PPS from GPS module 
      Clock & System jitter 
     | 
  
  
      | 
    Raspberry Pi #22 
      Raspberry Pi 4B, 4 GB 
      Buster 4.19.97-v71+ #1294 [32-bit] 
      PPS from GPS module 
      Clock & System jitter 
     | 
  
  
      | 
    Raspberry Pi #23 
      Raspberry Pi 4B, 4 GB 
      Buster 5.4.42-v8+ #1319 [64bit] 
      PPS from GPS module 
      Clock & System jitter 
     | 
  
  
     Windows systems | 
  
  
      | 
    Kiruna 
      Windows-10/64 PC 
      Intel i7-4770K 16 GB, 3.50 GHz 
      PPS over motherboard COM port 
      Clock & System jitter 
     | 
  
  
      | 
    Lund 
      Windows-10/64 PC 
      Intel i5-6400 16 GB, 2.70 GHz 
      PPS over add-in COM port 
      Clock & System jitter 
     | 
  
  
     LAN connected systems | 
  
  
      | 
    Alta 
      Windows-10/64 PC 
      Intel i5 760 8 GB, 2.80 GHz 
      [PPS m/b COM port - broken] 
      Clock & System jitter 
     | 
  
  
      | 
    Harstad 
      Windows-10/64 PC 
      Intel i5-4460 8 GB, 3.20 GHz 
      Sync over  house LAN 
      [PPS add-in COM port - broken] 
      Clock & System jitter 
     | 
  
  
      | 
    Penguin 
      Windows-10/64 PC 
      Intel i5-8400 32 GB, 2.8 GHz 
      Sync over house LAN 
      Clock & System jitter 
     | 
  
  
     Wi-Fi connected systems | 
  
  
      | 
    Floro 
      Windows-10/64 laptop 
      Intel i7-8565U 1.80 GHz 16 GB 
      NTP over 5 GHz Wi-Fi  
      Clock & System jitter 
     | 
  
      | 
    Raspberry Pi #20 
      Raspberry Pi Zero W, 512 MB 
      Buster 4.19.97+ #1294 
      NTP over 2.4 GHz Wi-Fi 
      Clock & System jitter 
     |