Shortwave Radiogram, 25-28 June 2020: Sending technosignatures to the far reaches of space.

Shortwave Radiogram

I’m not a fan of too much sunlight, such as what we are experiencing now in the Northern Hemisphere. Still, it might create some interesting propagation between our Northern Hemisphere transmitters and receivers in the Southern Hemisphere, where sunlight is at a minimum.

Also during our Northern Hemisphere summers is noise from lightning and other atmospheric phenomena. In addition to the usual sources caused by humans and  their devices.  There will be a long stretch of MFSK32 text at the beginning of the broadcast this weekend. Please note how well the
text survives noise, weak signals, and all the other degradations that make shortwave so much fun.

Videos of last weekend’s Shortwave Radiogram (program 157) are provided by Scott in Ontario (Friday 1300 UTC) and Ralf in Germany
(Sunday 2330 UTC – showing the MFSK32 text heroically prevailing amid
fading, noise, and a weak signal). 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 nine images (all MFSK64).

Here is the lineup for Shortwave Radiogram, program 158,  25-28 June 2020, in MFSK modes as noted:

1:41  MFSK32: Program preview
2:46  NASA funds SETI study to seek “technosignatures”
7:57  MFSK64: Rise and fall of automakers Dodge Brothers*
16:10  This week’s images*
28:28  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

Shortwave Radiogram Transmission Schedule

| 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 9925 kHz, via Germany. A minute of
MFSK is at about 0130 UTC.  Reports to Eric: . See also and

“This is a Music Show” Most of the show is a music
show, but the host transmits some text and images in various modes 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 US


An example of the solstice propagation from the Northern to Southern
Hemisphere: Frank in Perth, Western Australia, received these images
and text, 21 June 2020, 0800-0830 UTC, 7730 kHz from WRMI Florida (18300
km) …


Fuente: Shortwave Radiogram, 25-28 June 2020: Sending technosignatures to the far reaches of space.


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