The Mighty KBC, the VOA and PCJ radio will broadcast radiograms (digital text) over shortwave radio this weekend.
Reception conditions could be challenging depending on the impact of the incoming CME (Coronal Mass Ejection) which is expected to disrupt the high frequency bands today. All the more reason to attempt to decode these messages as Dr. Kim Elliott is studying each digital mode and its ability to effectively overcome adverse conditions. Email your reports and audio files to: email@example.com
Here are details from each broadcaster:
Broadcasting 14 April 2013 from 00:00-02:00 UTC on 7,375 kHz.
At about 0133 UTC, two slow (less than 60 WPM) but robust modes will be transmitted: Olivia 8-1000 centered on 1000 Hertz, and MFSK16 on 2000 Hertz.
At just before 0200 UTC, Olivia 8-2000, with Flmsg format, will be centered on 1500 Hertz.
VOA Radiogram for the weekend of 13/14 April 2013 will feature the Olivia modes, with MFSK modes also transmitted for comparison.
The modes will be transmitted in groups of three, and all will be centered on an audio frequency of 1500 Hertz, except where indicated:
Olivia 8-1000, 58 WPM, 1:32 (program menu)
MFSK 16, 58 WPM, 1:52
Olivia 8-1000, 58 WPM, 1:44
Olivia 32-2000, 50 WPM, 2:09
MFSK 22, 80 WPM, 1:50
Olivia 16-2000, 80 WPM, 1:51
MFSK 32, 120WPM, 2:04
Olivia 8-2000, 120WPM, 2:04
Olivia 4-2000, 160WPM, 1:40
Olivia 16-1000 (centered on 2000 Hz) versus music, 2:03
MFSK 32 closing text and image, :51
Reception reports with (if possible) sample audio and screenshots would be appreciated. Audio files from outside the United States are especially helpful.
Here is the VOA Radiogram broadcast schedule:
(all days and times UTC)
Sat 1600-1630 17860 kHz
Sun 0230-0300 5745 kHz
Sun 1300-1330 6095 kHz
Sun 1930-2000 15670 kHz
All via the Edward R. Murrow transmitting station in North Carolina.
PCJ Radio will transmit text on 14 April 2013 at 02:27 UTC via WRMI, Radio Miami International on 9,955 kHz. The mode will be Olivia 8-1000.