During last weekend’s Shortwave Radiogram, there were several examples of the MFSK16 text successfully decoding under difficult conditions. You can decode from this reception in Russia on 15770 kHz from WRMI Florida. See also my tweet about decoding the… Leer más ›

Typical summer weather here, but even more so. Many consecutive days of temperatures above 90F, or 32C. And several days above 95F, or 25C.These hot days are often capped in the late afternoon or early evening with a rollicking thunderstorm…. Leer más ›

In our part of the world, summer weather is here. We usually keep the air conditioning off as long as possible, but, finally, it was necessary today. Upstairs, where I produce Shortwave Radiogram, the effort of the AC is, at… Leer más ›

As a retired bureaucrat, I prefer to play radio. But occasionally I get involved in the debate about US international broadcasting, as in my recent opinion piece in The Hill. It’s a sequel to another piece in The Hill back… Leer más ›

Last weekend, there were a few examples of the Olivia modes, especially 64-2000, surviving conditions where MFSK32 showed errors. You can listen to and decode from one example posted here – WINB as received in South Australia. Videos of last… Leer más ›

For some of the Shortwave Radiogram transmissions last weekend,propagation was difficult. On other transmissions, reception was great. We can declare success if 90% of the MFSK32 text decodes correctly. That will often happen even under very difficult reception conditions. Videos… Leer más ›

I hope this finds you well and avoiding the COVID-19 and any other viruses that might be lurking. With most of us spending most of our time at home, radio and the various radio-associated hobbies and pastimes are a good… Leer más ›

Last weekend, it was, as usual, difficult to find a Shortwave Radiogram signal bad enough to provide a good test for our slow modes: Olivia 64-2000 and MFSK16. There were, however, a few instances of Olivia 64-2000 succeeding where the… Leer más ›

In this time of transition from winter to summer (or vice versa in the Southern Hemisphere), reception of Shortwave Radiograms good at some times on some frequencies, and marginal at other times and on other frequencies.  Because many of us… Leer más ›

Here in North America, now that the transition to Daylight Savings (summer) Time is complete, there are some additional changes to the Shortwave Radiogram schedule. The schedule for WINB on 9265 kHz stays with Eastern local time, so Shortwave Radiogram… Leer más ›

If you will be attending the Winter SWL Fest this weekend near Philadelphia, I look forward to seeing you there. Also a reminder about this very useful reference for new and experienced Shortwave Radiogram decoders: https://wiki.radioreference.com/index.php/Shortwave_Radiogram_Gateway Videos of last weekend’s… Leer más ›

Today (February 13) is UNESCO’s World Radio Day. The day is not so much for radio enthusiasts, but to promote the social goals of UNESCO by way of radio. Nevertheless, it’s good to have a day that acknowledges radio. So… Leer más ›

During the past week, WRMI was reported in 11580 kHz, replacing 15770 kHz. I was ready to change the Shortwave Radiogram transmission schedule (below), when listeners informed me that WRMI was back on 15770. In response to my email, WRMI… Leer más ›

I was afraid that eventually I would lose track of Shortwave Radio program numbers. Well, It happened in last weekend’s email. I wrote that the weekend’s show number was 133, but it was, of course, 134. And this weekend it… Leer más ›

The holidays have come and gone. Rather quickly, it seems. In any case, I hope you enjoyed the festive season. Thanks for your support and friendship in 2019, and best wishes for 2020. Listeners have alerted me to a new… Leer más ›

By way of a holiday card, above is last weekend’s painting of the fir tree, received by Michael in the UK, 15 December 2019, 2330-2400 UTC, 7780 kHz from WRMI Florida. Thanks to all who sent  reports last weekend, with… Leer más ›

Seasonal propagation – nearing the winter solstice in the northern hemisphere – has resulted in interesting reception in many parts of the world. The Sunday 0800-0830 broadcast is now almost routinely received in Europe, more likely on 5850 kHz which… Leer más ›

Thanks to those you who participated in last weekend’s test of the low-but-robust modes Olivia 32-2000 and MFSk16. There were some examples (see this example) of those two modes providing good decodes when the faster MFSK32 and MFSK64 showed errors…. Leer más ›

In the Northern Hemisphere, the shift back to winter time is complete. On our WRMI frequencies, Shortwave Radiogram stays at the same UTC times, so most of you will be tuning in those broadcasts one hour earlier by local time. On WINB’s… Leer más ›

Most of Europe moves its clocks forward this Sunday, 27 October. The WRMI transmissions will remain at their present UTC times, so they will be an hour earlier by local time in Europe. WINB usually keeps its analog 9265 kHz… Leer más ›

Thanks to Al in Florida, WD4AH, @WD4AK_Al , for moderating the @SWRadiogram Twitter account and helping with transmission tasks, 26 September-6 October, while my wife and I were in eastern Canada and Maine for a vacation. A video of program… Leer más ›

Last weekend’s “hidden message” in BPSK63F at 70 Hz was fairly successful. Several listeners reported successful decodes. It looks like 70 Hz will be our standard frequency for text that is mostly inaudible but usually decodable. There will be no hidden message… Leer más ›

We are happy to know that WRMI in Okeechobee, Florida, was spared a direct hit by Hurricane Dorian. The Shortwave Radiogram schedule should, therefore, proceed as normal. WRMI was not entirely unscathed, having experienced some internet disruptions. Good luck to… Leer más ›

Our “hidden message” last week in the PSK125R mode was not as successful as the BPSK63F two weeks previously. Because the PSK125R is a wider mode, I had to put it as low as possible to prevent it from being… Leer más ›

Last weekend, Shortwave Radiogram included a brief “hidden message” during the closing music. It was in the BPSK63F mode, centered on 50 Hz. At that very low audio frequency, it was not audible. I did not publicize this message last… Leer más ›

Unless I am interrupted by some urgent task, this notice should be posted on time, i.e. before the first broadcast of Shortwave Radiogram Thursday at 2330 UTC. Which is an improvement over the late notices during the past two weeks…. Leer más ›

Sorry that I am late with this week’s notice. The first broadcast (Thursday, 11 July 2019, 2330 UTC) has already been transmitted. You can see some results below. Videos of last weekend’s Shortwave Radiogram (program 107) are provided by Scott… Leer más ›

Thanks to those of you who offered suggestions and assistance as I prepare a new guide to decoding the modes, especially making the audio connection between the radio and the computer or Android device.  If I have not responded directly… Leer más ›

This weekend our modes will again be MFSK32 and MFSK64. These modes work very well in shortwave broadcast conditions, with MFSK32 more successful, although slower, if reception is somewhat difficult. Now we need a simple, receive-only, decode-only software for PCs,… Leer más ›

The only mishap last week was the absence of 5850 kHz Sunday at 0800-0830 UTC. During that half hour, the other frequency from WRMI Florida, 7730 kHz, did transmit. Also this reminder of the new first transmission of the “weekend,”… Leer más ›

Last week’s ASCII art was largely successful, with several examples of a crisp SHORTWAVE RADIOGRAM even in difficult reception conditions. You can see examples below. Videos of last weekend’s Shortwave Radiogram (program 99) are provided by Scott in Ontario (Friday… Leer más ›

Last weekend’s Shortwave Radiogram was a reminder of the ability of MFSK16 to provide a correct decode even in difficult shortwave conditions. Thank you for your reception reports, especially listeners in Japan who decoded, or attempted to decode, the excerpt… Leer más ›

Too late for last weekend’s email, I was informed that the Friday 2030-2100 UTC broadcast of Shortwave Radiogram was replaced in the WRMI by a religious program. WRMI has provided this replacement time slot: Friday at 1300-1330 UTC on 15770… Leer más ›

Apologies for the missing transmission last weekend on 9400 kHz. I hope the Saturday’s 1400 UTC broadcast is heard this without mishap. During the broadcasts that were heard, our experiment with simultaneous  English and Spanish text, using side-by-side MFSK32 streams,… Leer más ›

Last week’s Shortwave Radiogram was very colorful, except for the two gray-scale (also known as grey-scale) images, which were very “blackandwhiteful”. See one example below and many more at https://twitter.com/swradiogram or @SWRadiogram on Twitter. However, apologies for the malfunction last… Leer más ›

In most of North America, clocks will move forward one hour on Sunday, 10 March. The WRMI schedule on frequencies used for Shortwave Radiogram stays with UTC, so the local time of the show will be one hour later. The… Leer más ›

Last call for the Winter SWL Fest, 28 February to 2 March in Plymouth Meeting, Pennsylvania (near Philadelphia). I will be there, weather permitting. And see information below about “This is a Music Show,” on WRMI, which includes some MFSK…. Leer más ›

A reminder that the Winter SWL Fest will be 28 February-2 March at Plymouth Meeting, Pennsylvania (near Philadelphia). Information at swlfest.com. I will be there to demonstrate Shortwave Radiogram. SSTV will be transmitted this weekend from the International Space Station,… Leer más ›

Last weekend was our second week of Shortwave Radiogram transmitted by DRM (Digital Radio Mondiale) from WINB in Pennsylvania. I was able to receive almost the entire half hour, and all of the images, using an SDR in Italy. DRM… Leer más ›

Sorry about the late start of the 1400-1430 UTC show last Saturday. Let’s hope the transmitter in Bulgaria on 9400 kHz gives us the full half hour this weekend. New this weekend is transmissions of Shortwave Radiogram from WINB in… Leer más ›

The humble municipal Christmas decorations featured in last weekend’s program resulted in many nice shortwave-enhanced MFSK64 images, submitted by listeners via email and Twitter (@SWRadiogram). Some examples are below. Videos of last weekend’s Shortwave Radiogram (program 79) are provided by… Leer más ›