A few NDB logs

The NDBs around Otopeni & Baneasa airports (click on image to enlarge)

During a recent visit to Romania and Northern Greece, I managed to hear a few local NDBs using a Sangean ATS-909 portable radio:

2019-10-29  14:35  349.0   OPE  Otopeni, ROM
2019-10-29  14:36  370.0   OTL  Otopeni, ROM
2019-10-29  14:37  521.0   BSW  Baneasa, ROM
2019-10-29  14:38  256.0   BSE  Baneasa, ROM
2019-10-29  14:39  267.5   OPW  Otopeni, ROM
2019-10-29  14:40  284.0   GNA  Gorna, BUL
2019-10-29  14:41  318.0   OTR  Otopeni, ROM
2019-10-30  17:25  345.0   THS  Thessaloniki, GRC

The ATS-909 is bulky by current standards and not sensitive in the NDB band, so it is, perhaps, the last time I take it with me.


ZS4BS's Worldwide List of HF Beacons

TS-50S based IARU/NCDXF beacon

According to recent news, Martin Harrison G3USF stepped down as IARU R1 Beacon coordinator, and the position was taken over by Dennis Green, ZS4BS <zs4bs@iaru-r1.org

Dennis now publishes the list for HF beacons at:



G3USF's Worldwide List of HF Beacons

The IARU Region 1 beacon coordinator is Martin Harrison, G3USF. Martin is a member, and a past Chairman, of the RSGB Propagation Studies Committee (PSC). He used to maintain two comprehensive and detailed lists of beacons.

The last published version of the worldwide HF beacon list compiled by Martin Harrison G3USF was on May 23, 2018. I have saved it here: G3USF's Worldwide List of HF Beacons  for future reference. 

The Low VHF (40-50 MHz) beacon list by G3USF is still updated regularly, you may see the latest version here: G3USF's Worldwide List Of 50MHz Beacons.

An alternative 28 MHz beacon list by Bill Hays, WJ5O, is also available and updated frequently here: 10 meter Beacon List.




World War II radio & radar history (4)

More YouTube videos related to World War II radio, SIGINT and radar:

Spy Radio in World War II: "Strategic Service Transmitter-Receiver Number 1", or SSTR-1, of the Office for Strategic Services (OSS).

BC-375 transmitter, used in B17 "flying fortress" bombers


Still active: ROS network on 27635 kHz

Freebanders using ROS, heard on 27635 kHz
The digital freebanders' network on 27635 kHz (11 m), described in a post on 2017-04-06, remains active. The current (July 22) Es openning in Europe allowed strong signals into Greece from Maidenhead locator fields JN and JO. Stations in this extensive network use the ROS MFSK protocol calling CQ or transmitting beacons in various data rates (4, 8 and 16 baud). 

Fortunately PSK reporter supports 11m activities and allows plotting the stations on a map.