Shortwave Radiogram, 16-19 April 2020: Digital modes to the asteroids (and beyond)

Shortwave Radiogram

Our only mishap last weekend was a late transmitter start at WRMI, resulting in the Friday 1300 UTC transmission on 15770 kHz not starting until about 1310 (in progress). Especially at WRMI, when a transmitter does not start on time, it’s worth staying tuned, because the engineers are usually aware of the problem, and often they are able to fix it before the half hour is over. In the meantime, we converse about the absence of the signal on Twitter @SWRadiogram, and probably also at the Facebook group listened below.

Last week’s exotic mode was Olivia 32-2000 (32 tones, 2000 Hz bandwidth). Listeners reported some instances of the 32-2000 decoding in difficult reception situations where the MFSK32 showed errors. The
speed of Olivia 32-2000, at 50 words per minute, is not too bad, so we might want to experiment more with this mode in the future.

Videos of last weekend’s Shortwave Radiogram (program 147) are provided by Lolo sdr in Spain (Friday 1310 UTC), Scott in Ontario (Saturday 1330 UTC), @K7al_L3afta in Morocco (Sunday 2330 UTC MFSK64 excerpt), and RIZ-LA Radio in (I think) North Carolina (Sunday 2330 UTC excerpt decoded with TIVAR).The audio archive is maintained by Mark in the UK. Analysis is prepared by Roger in Germany.

This weekend’s show is in the usual MFSK32 and MFSK64, with twelve MFSK  images.

Here is the lineup for Shortwave Radiogram, program 148, 16-19 April 2020, in MFSK modes as noted:

1:43  MFSK32: Program preview
2:53  Rehearsal of Virgin’s 747 “flying launchpad”*
7:33  MFSK64: Asteroid ‘Oumuamua might be planet shard*
11:28  This week’s images*
28:34  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 Gateway Wiki

| UTC Day  | UTC Time      | Frequency        | Transmitter       |
| Thursday | 2330-2400 UTC | 9265 kHz         | WINB Pennsylvania |
| Friday   | 1300-1330 UTC | 15770 kHz        | WRMI Florida      |
| Friday   | 1500-1530 UTC | 15750 kHz DRM    | WINB Pennsylvania |
| Saturday | 0230-0300 UTC | 9265 kHz         | WINB Pennsylvania |
| Saturday | 1330-1400 UTC | 15770 kHz        | WRMI Florida      |
| Sunday   | 0800-0830 UTC | 5850 and 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 EDT) on 5960 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 on WRMI, Thursdays at 0200-0300 UTC on 5850
kHz (Wednesday evening in the Americas) and a new time also on WRMI,
Wednesdays at 2100-2200 UTC on 7780 kHz (aimed towards Europe) . 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. 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 2300 UTC (7 pm EDT) on 3536 kHz USB.


Christopher, K6FIB, in Oregon, received these images 12 April 2020,
0800-0830 UTC, 5850 kHz from WRMI Florida. Christopher tracks news about
DRM shortwave broadcasting at his website and @drmna_info Twitter account.


Fuente: Shortwave Radiogram, 16-19 April 2020: Digital modes to the asteroids (and beyond)


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