The main transmitting (Tx) station is operated in Chofu, Tokyo, within the Chofu Campus of UEC (JG2XA). JG2XA transmits continuous waves with a power of 200 W at 5006 kHz and 8006 kHz. The station ID is transmitted every 5 minutes by an amplitude modulation of the carrier in morse code with the callsign JG2XA and its objective "UEC HFD STATION". The type of radio signal is H2A (amplitude modulation with coded tones by single sideband).
Operation log (transmission side only)
At some stations, we also observe (or observed in the past) signals of Radio Nikkei 1 (JOZ4 at 3925 kHz, JOZ2 at 6055 kHz, and JOZ3 at 9595 kHz) transmitted respectively from Nagara, Chiba (JOZ2/JOZ3) and from Nemuro, Hokkaido (JOZ4), Japan.
Receiving (Rx) Stations:
Note 1: At the Onna station in Okinawa, until May 2017, we had used two receivers (ON1 and ON2) to observe 8 frequencies in total at the same time.
Note 2: Old analogue Rx systems are being replaced with a new one based on the software-defined radio (USRP N210). Such digital Rx stations are given IDs like "AWJ-D" ("-D" has been added to the 3 letter code). A technical paper describing the analogue/digital receiving systems has been published.
Note 3: Operation of the Rx station in Kure is supported by Dr. Yamamoto at Japan Coast Guard Academy.
Note 4: Operation of the Rx station in Kyoto was supported by World Data Center for Geomagnetism, Kyoto University.
Note 5: Operation of the Rx station in Iitate has been supported by Planetary Plasma and Atmospheric Research Center (PPARC), Tohoku University.
Note 6: The operations of the Rx stations in Sarobetsu, Oarai, Onna are carried out in collaboration with National Institute of Information and Communications Technology (NICT).
The HFDOPE project is financially supported by
Operation log (transmission side only)
At some stations, we also observe (or observed in the past) signals of Radio Nikkei 1 (JOZ4 at 3925 kHz, JOZ2 at 6055 kHz, and JOZ3 at 9595 kHz) transmitted respectively from Nagara, Chiba (JOZ2/JOZ3) and from Nemuro, Hokkaido (JOZ4), Japan.
Receiving (Rx) Stations:
| Station | Location | Frequency (kHz) | Period of Operation | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Name | ID | Glat (N) | Glon (E) | CH#0 | CH#1 | CH#2 | CH#3 | Start Date | End Date |
| Sarobetsu | SAR-D | 45.162 | 141.754 | 5006 | 8006 | 6055 | 3925 | Nov 19, 2020 | |
| Iitate | IIT | 37.689 | 140.673 | 5006 | 8006 | June 1, 2014 | June 7, 2022 | ||
| Iitate | IIT-D | 37.689 | 140.673 | 5006 | 8006 | 6055 | 3925 | June 8, 2022 | |
| Sugadaira | SGD | 36.423 | 138.318 | 5006 | 8006 | 6055 | 9595 | Oct 24, 2002 | |
| Sugadaira | SGD-D | 36.423 | 138.318 | 5006 | 8006 | 6055 | 3925 | June 30, 2022 | |
| Kakioka | KAK | 36.232 | 140.186 | 5006 | 8006 | 6055 | 9595 | Feb 14, 2011 | Feb 5, 2018 |
| Oarai | ORI | 36.331 | 140.587 | 5006 | 8006 | 6055 | 9595 | May 18, 2004 | Sep 27, 2020 |
| Oarai | ORI-D | 36.331 | 140.587 | 5006 | 8006 | 6055 | 3925 | Sep 28, 2020 | |
| Kashima | KSM | 35.953 | 140.663 | 5006 | 8006 | 6055 | 9595 | Mar 9, 2004 | Oct 3, 2020 |
| Sugito | SGT | 36.042 | 139.708 | 5006 | 8006 | 6055 | 9595 | Mar 30, 2014 | |
| Chiba | CHB-D | 35.629 | 140.104 | 5006 | 8006 | 6055 | 3925 | June 11, 2020 | |
| Kiso | KIS | 35.797 | 137.623 | 5006 | 8006 | 6055 | 9595 | Mar 30, 2009 | May 6, 2011 |
| Shimizu | SMZ | 34.983 | 138.517 | 5006 | 8006 | May 17, 2004 | Sep 10, 2004 | ||
| Fujisawa | FJS | 35.320 | 139.457 | 5006 | 8006 | 6055 | 9595 | May 29, 2011 | June 20, 2020 |
| Fujisawa | FJS-D | 35.320 | 139.457 | 5006 | 8006 | 6055 | 3925 | Dec 18, 2020 | |
| Kyoto | KYO | 35.028 | 135.786 | 5006 | 8006 | 6055 | 9595 | Feb 26, 2004 | Aug 3, 2016 |
| Awaji | AWJ | 34.293 | 134.736 | 5006 | 8006 | 6055 | 9595 | Mar 14, 2019 | Dec 31, 2020 |
| Awaji | AWJ-D | 34.293 | 134.736 | 5006 | 8006 | 6055 | 3925 | Jun 2, 2020 | Dec 8, 2022 |
| Kure | KUR | 34.243 | 132.529 | 5006 | 8006 | Mar 24, 2003 | Jun 4, 2023 | ||
| Kure | KUR-D | 34.243 | 132.529 | 5006 | 8006 | 6055 | 3925 | Jun 5, 2023 | |
| Kokura | KOK-D | 33.816 | 130.872 | 5006 | 8006 | 6055 | 3925 | May 11, 2021 | |
| Aso | ASO | 32.885 | 131.007 | 6055 | 8006 | 5000 | 9595 | Mar 13, 2009 | Apr 16, 2016 |
| Onna1 | ON1 | 26.499 | 127.845 | 5006 | 8006 | 6055 | 9595 | Nov 25, 2010 | May 19, 2017 |
| Onna2 | ON2 | 26.499 | 127.845 | 5000 | 10000 | 15000 | 3925 | Nov 25, 2010 | May 19, 2017 |
| Onna | ONA-D | 26.499 | 127.845 | 5006 | 8006 | 6055 | 3925 | Jun 12, 2020 | |
Note 1: At the Onna station in Okinawa, until May 2017, we had used two receivers (ON1 and ON2) to observe 8 frequencies in total at the same time.
Note 2: Old analogue Rx systems are being replaced with a new one based on the software-defined radio (USRP N210). Such digital Rx stations are given IDs like "AWJ-D" ("-D" has been added to the 3 letter code). A technical paper describing the analogue/digital receiving systems has been published.
Note 3: Operation of the Rx station in Kure is supported by Dr. Yamamoto at Japan Coast Guard Academy.
Note 4: Operation of the Rx station in Kyoto was supported by World Data Center for Geomagnetism, Kyoto University.
Note 5: Operation of the Rx station in Iitate has been supported by Planetary Plasma and Atmospheric Research Center (PPARC), Tohoku University.
Note 6: The operations of the Rx stations in Sarobetsu, Oarai, Onna are carried out in collaboration with National Institute of Information and Communications Technology (NICT).
The HFDOPE project is financially supported by