Shortwave Radiogram, 8-11 August 2019: Digital modes from dead planets

Shortwave Radiogram

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.

Videos of last weekend’s Shortwave Radiogram (program 111) are provided by Scott in Ontario (Friday 1300 UTC) and Ralf in Germany (Sunday 2330 UTC). The audio archive is maintained by Mark in the UK. Analysis is prepared by Roger in Germany (and includes a look at the BPSK63F at 50 Hz on the spectrum).

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

And visit

Twitter: @SWRadiogram or (visit during the weekend to see listeners’ results)

Facebook group:

|            Shortwave Radiogram Transmission Schedule           |
| UTC Day  | UTC Time      | Frequency     | Transmitter site    |
| Thursday | 2330-2400 UTC | 9265 kHz      | WINB Pennsylvania   |
| Friday   | 1300-1330 UTC | 15770 kHz     | WRMI Florida        |
| Friday   | 1500-1530 UTC | 15120 kHz DRM*| WINB Pennsylvania   |
| Saturday | 0230-0300 UTC | 9265 kHz      | WINB Pennsylvania   |
| Sunday   | 0800-0830 UTC | 5850 7730 kHz | WRMI Florida        |
| Sunday   | 2330-2400 UTC | 7780 kHz      | WRMI Florida        |


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: . See also and

“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. .

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 , 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.


@Hangar77Bob in Mississippi decoded these images 4 August 2019 at
2330-2400 UTC on 7780 kHz from WRMI Florida. His “you’re welcome” is in
response to the hidden message: Thank you for decoding the modes on
Shortwave Radiogram …

Fuente: Shortwave Radiogram, 8-11 August 2019: Digital modes from dead planets


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