Friday, April 19, 2013

VOA Radiogram April 20-21 will feature Thor modes

VOA Radiogram April 20-21 will feature Thor modes

During the weekend of April 20 and 21, the featured mode of VOA Radiogram will be Thor. We will use the faster versions of Thor, which can be decoded using an updated version of Fldigi from MFSK modes will also be transmitted for comparison.

Here is the menu (all modes centered on 1500 Hertz):
MFSK16 introduction (58 wpm)
THOR22 (~75 wpm)
MFSK22 (80 wpm)
THOR25x4 (~90 wpm)
MFSK32 (120 wpm)
MFSK16 image
THOR50x1 (~180 wpm)
THOR50x2 (~180 wpm)
MFSK64 (240 wpm)
THOR100 (~360 wpm)
MFSK128 plain text (480 wpm)
MFSK128 Flmsg format
MFSK32 text and image

Last weekend’s broadcast and the results so far

Thanks to everyone who has reception reports, audio samples, screenshots, and other interesting materials. After the program on the weekend of April 13-14, featuring the Olivia modes, we heard from listeners in Austria, Belgium, Canada (BC and Ontario), Colombia, Finland, France, Germany, Italy, Russia, Sweden, UK, and Ukraine, as well as from the US states of Arizona, Arkansas, California, Colorado, Georgia, Iowa, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New Jersey, North Carolina, Ohio, Oregon, South Carolina, Tennessee, Texas and Virginia.

The results, after five weekends of VOA Radiogram, indicate that, for use in analog amplitude modulated shortwave broadcasting, the PSK modes are good, the MT63 and Olivia modes very good, and the MFSK modes are excellent. MFSK has so far outperformed the other families of modes. This weekend, MFSK faces one more “competitor,” the Thor mode.

QSL cards

The process of producing and printing the QSL cars is moving along slowly. If you requested a QSL card, it will be sent eventually. Thanks for your patience.

VOA Radiogram transmission 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.