Hello friends,

A new transmission time for Shortwave Radiogram has been added. It is UTC Monday 0030-0100 UTC (Sunday evening in the Americas) on 5050 kHz from WRMI Florida. The 5050 frequency from WRMI is heard well in Florida and the Caribbean, but beyond those areas reception of 5050 is DX. This provides an opportunity to test our slower text modes. In fact, this time slot will eventually be taken over by «Extreme Shortwave,» which will be dedicated to the slow and robust modes — and usually no images.

Last week, in addition to our usual MFSK32 and MFSK64, we experimented with Olivia 64-2000, a slow (24 wpm) but robust mode, to demonstrate the ability of old analog shortwave broadcast transmitters to convey information in difficult reception conditions. Some transmissions provided several examples of challenging reception at SDR sites.

One example was during the Sunday 1430 UTC transmission, 9955 kHz from WRMI Florida, via an SDR in Michigan. Reception of 9955 in Michigan is typically difficult, but it was made even more so by wide-band interference that covered the upper 65% of the Olivia 64-2000 tones. Nevertheless, the Olivia 64-2000 decoded 100%. The screenshot below shows the mostly unsuccessful MFSK32 text, changing over to the 100% Olivia 64-2000 … 

This week Shortwave Radiogram will include Olivia 32-2000 between the MFSK32 and MFSK64 news items. With only 32 tones, it will be less slow (about 48 wpm) than the Olivia 64-2000, but it still might decode well in  difficult reception conditions. 

A video of last week’s Shortwave Radiogram (program 452) is provided by Scott in Ontario (Wednesday 1330 UTC). The audio archive is maintained by Mark in the UK. Analysis is provided by Roger in Germany.

Here is the lineup for Shortwave Radiogram, program 453, 11-18 June 2026, in MFSK and Olivia modes as noted:

 1:47  MFSK32: Program preview
 3:04  MFSK32: NASA’s X-59 jet breaks sound barrier
 6:23  Olivia 32-2000*: Another «Extreme Shortwave» announcement
 7:47  MFSK64: Like East India Company, SpaceX dominates market
12:54  MFSK64: This week’s images
28:05  MFSK32: Closing announcements

* Turn Fldigi SQL (squelch) off for Olivia 32-2000

Please send reception reports to radiogram@verizon.net

And visit http://swradiogram.net

Bluesky:swradiogram.bsky.social or  swradiogram.bsky.social

Twitter: @SWRadiogram or https://twitter.com/swradiogram

(visit during the weekend to see listeners’ results)

Facebook group: https://www.facebook.com/groups/567099476753304

Shortwave Radiogram Gateway Wiki: https://wiki.radioreference.com/index.php/Shortwave_Radiogram_Gateway

Shortwave Radiogram Transmission Schedule

Other Shortwave broadcast programs that include digital text and images include The Mighty KBC, Pop Shop Radio and Radio North Europe International (RNEI). Links to these fine broadcasts, with schedules, are posted here.

Thanks for your reception reports!

Kim

Kim Andrew Elliott, KD9XB
Producer and Presenter
Shortwave Radiogram
Reporting on international broadcasting at https://twitter.com/kaedotcom

Fuente: https://swradiogram.net/

Categorías:Broadcasting

Etiquetas:Digital Modes, Frecuencias, MSFK64, Onda Corta, Shortwave, SW, SWL