UDXF Info  Recordings Pictures Links About

Utility related ham events + JOTA

Armed Forces Day

Armed Forces Day Crossband Communication Test:  


23 May 2023

Museum Ships Weekend


3 June 2023, 0000 UTC - 4 June, 2359 UTC

Night of Nights


12 July every year. Begins at 0300pm Pacific time on 12 July.  The first transmission will be at 0501pm Pacific time (0000 UTC 13 July).

Intl. Lighthouse/Lightship Weekend


19 August 2023, 0000 UTC - 20 August, 2400 UTC

17 August 2024, 0000 UTC - 18 August, 2400 UTC

Jamboree On The Air


20-22 Oct 2023

World Amateur Radio Day

18 April every year

Maritime Radio Day

14 + 15 April 2023

DX Cluster

The propagation prediction above comes from N0NBH’s excellent website

HF Conditions

Digital Broadcasts on HF

Besides the well known AM broadcasts transmitted by local and international Broadcasting Companies, there are also transmissions in digital modes on MW and HF.


Many Short Wave Listeners are familiar with DRM, Digital Radio Mondiale, which never was very successfull. Only a handful of stations still transmit in DRM. Schedules can be found on the following websites HFCC, DRM Project, DRM.org

The former VoA Radiogram is now transmitted under the name Shortwave Radiogram in various digital modes like MFSK, PSK, Olivia, etc. More info and schedules can be found on their

website: Shortwave Radiogram


Software to decode DRM transmissions: Dream. Many Kiwi web sdrs and some sdr interfaces can also decode the signal.

Software to decode the above mentioned HAM modes:

Fldigi , Multipsk, HAM radio deluxe

Fldigi for Android: TIVAR

Further info

How to copy the Shortwave Radiogram digital broadcasts using a PC or laptop


How to copy the Shortwave Radiogram tests using an Android device (tablet, smartphone)