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 week, because I was not sure that data at such a low audio frequency would actually be pass through the WINB and WRMI transmitters. When I established that the data was transmitted by both stations, I publicized it in the @SWRadiogram Twitter account. A few listeners were able to decode the BPSK63F. The BPSK63F is not as robust as the MFSK modes we usually use, so it did sometimes fail during fades. But it could work on a local AM (medium wave) station, where fading is not generally an issue, coexisting inaudibly with the voice and music programming. We’ll try this again in future shows.
Thanks to those of you who stated your preference on the line breaks at 65 characters. There is now definitely a consensus in favor of the 65-character breaks rather than “natural” line wrapping.
This weekend’s show is in the usual MFSK32 and MFSK64. with nine MFSK images.
Here is the lineup for Shortwave Radiogram, program 112, 8-11 August 2019, in MFSK modes as noted:
1:47 MFSK32: Program preview
2:57 Czech restaurant’s 50-crown fine for not clearing plate
6:34 MFSK64: Radio waves from dead planets*
10:40 How the 5 riskiest U.S. cities are preparing for floods*
15:23 This week’s images*
27:18 MFSK32: Closing announcements
* with image(s)
Please send reception reports to firstname.lastname@example.org
The Mighty KBC transmits to North America Sundays at 0000-0200 UTC (Saturday 8-10 pm EDT) on 9925 kHz, via Germany. A minute of MFSK is at about 0130 UTC. Reports to Eric: email@example.com . See also http://www.kbcradio.eu/ and https://www.facebook.com/TheMightyKbc/.
“This is a Music Show” is the newest addition to digital modes via analog shortwave. Most of the show is a music show, but the host transmits some MFSK text and image near the end of the broadcast. It’s transmitted Thursday 0100-0200 UTC (Wednesday evening in the Americas) on 5850 kHz, and Thursday 0130-0230 UTC (Wednesday evening in the Americas) on 9395 kHz, both frequencies via WRMI Florida. Also look for a waterfall ID at the beginning of the show. firstname.lastname@example.org . www.instagram.com/thisisamusicshow/ www.twitter.com/ThisIsAMusicSho/
New York and Pennsylvania NBEMS nets. Most weekends, as KD9XB, I check in to the New York NBEMS (Narrow Band Emergency Messaging Software) net Saturday at 1200 UTC on 3584 kHz USB, and the Pennsylvania NBEMS net Sunday at 1200 UTC on 3583 kHz USB (with out-of-state check-ins now starting at 1130 UTC). Check-ins are usually in Thor 22, and messages are in MFSK32 (PA NBEMS is experimenting with Thor 50×1 for messages). Messages generally use the Flmsg add-on to Fldigi. If you are a radio amateur in eastern North America, feel free to check in. Outside the region, use an SDR in the eastern USA to tune in and decode. You do not need Flmsg to check in, and most of the messages can be read without Flmsg. If you can decode the net, send me an email to email@example.com , or tweet to @SWRadiogram , and I will let them know you are tuned in. USEast NBEMS Net: Please also note the USEast NBEMS Net, Wednesdays at 2300 UTC (7 pm EDT) on 3536 kHz USB. I will try to check in to this net more frequently.jjjj