Last week (program 211), at the suggestion of Tobias in Germany, we eliminated the short (about 0.6 second) gap between the text introduction and the image itself. This seemed to result in fewer failed image due to missed headers. Why… Leer más ›

Shortwave Radiogram listeners have kindly offered suggestions for experiments with our digital modes. Tobias in Germany suggests that eliminating the brief silence (about 0.6 second). between the text introduction of an MFSK image and the image transmission, can reduce or… Leer más ›

If you are participating in amateur radio’s Field Day this weekend, enjoy the event and good luck in the contest. The only Shortwave Radiogram during Field Day operating hours is Sunday 0800-0830 UTC on 5850 and 7730 kHz. Tune in… Leer más ›

We can claim success with last week’s transmission of Russian, especially because it was received successfully via SDRs in Russia. This was during two transmissions, including Sunday 2330. Videos of last weekend’s Shortwave Radiogram (program 208) are provided by Scott in Ontario (Friday… Leer más ›

This week, after months of planning, preparation, and purchases, three new amateur radio antennas were installed on my roof. They are 1) a 10 and 6 meter vertical, 21 feet (6.4 M) tall, 2) a homebrew 10 and 6 meter… Leer más ›

Shortwave Radiogram received some publicity on the May 7th edition of Amateur Radio Newsline. The audio and text are available here and the video version here. Thanks to Benn Kobb, AK4AV, for presenting the report. Videos of last weekend’s Shortwave Radiogram (program 203)… Leer más ›

If you read this soon enough, you might be able to receive and decode SSTV (Robot36) transmissions on shortwave (HF) in the narrow FM mode from a site in Russia. These will take place May 7 at 0800-0900 and 1300-1400… Leer más ›

Our first round of experiments with HamDRM is now complete. Thanks to Daz Man in Australia for converting our program 200 to HamDRM. When it succeeded, the result was the text of the program in html, with perfect images embedded.  DRM is fussy about the quality… Leer más ›

Last week’s experiment with text in the Burmese languages went well. It seems the Burmese was decoded successfully just about everywhere – except Myanmar. But, then, we don’t have any transmitters with good reception in Southeast Asia. It was decoded in… Leer más ›

Did we survive the time changes and frequency changes of Spring 2021? The only new frequency this weekend is the Friday 1500-1530 UTC DRM transmission from WINB Pennsylvania, on new 15750 kHz, replacing 13655, for those of you who have… Leer más ›

 This Sunday, 28 March, begins the change of clocks to summer time in most of Europe. Because our transmissions on Sunday remain at the same UTC time, most European listeners will hear them one hour later by local time. Shortwave… Leer más ›

This weekend begins the dreaded seasonal changing of the clocks. Most of North America will move clocks forward one hour at 2:00 am local time on Sunday. On the frequencies used by WRMI for Shortwave Radiogram on Sunday, the UTC… Leer más ›

Reception was certainly variable last weekend, with successes and difficulties. Typical shortwave. See results at the Twitter account @SWRadiogram, or point your browser to https://twitter.com/swradiogram and scroll down. For listeners in Europe, there may be a few more chances to tune in… Leer más ›

Last weekend’s experiment with Khmer text was usually successful. There were examples in which the MFSK64 English decoded perfectly, but the Khmer followed it showed some errors. This is not too surprising given that printing the Khmer seems a rather… Leer más ›