Shortwave Radiogram, 2-5 April 2020: More strange radio experiments to pass the stay-at-home hours

Shortwave Radiogram

Last weekend’s experiment with Olivia 16-1000 produced results that were definitely indefinitive. In the few cases where I could find a signal bad enough to give the mode a real test, the Olivia 16-1000 did not seem any better than the MFSK32, and not much better than the MFSK64. It reminds us why we like the MFSK modes on Shortwave Radiogram. However, there was one example 
of improbable reception in South Australia of the Sunday 2330-2400 UTC broadcast on 7780 kHz. Despite a nearly inaudible signal, the Olivia 16-1000 decoded well.

Shortwave Radiogram listeners have produced videos of last weekend’s
reception (program 145), which include examples of Olivia 16-1000 versus
the MFSK modes: youngalientype in Ohio (I think) (Friday 1300 UTC Olivia 16-1000 excerpt, Ralf in Germany, Lolo sdr in Spain, and Scott in Ontario
(all Saturday 1330 UTC), and, amazingly for this far into spring,
reception in Europe, Sunday at 0800 UTC on 7730 kHz, captured by i0kte stafano in Italy (excerpt) and Lolo sdr in Spain. The audio archive is maintained by Mark in the UK. Analysis is prepared by Roger in Germany.

With most of us required to stay at home, this weekend we will try more experiments
with modes designed for especially bad reception. So let’s hope for at
least some bad reception. We will try two approaches: 1) Olivia 64-2000,
which spreads the data 2000 Hz wide, using most of the bandwidth we
have in a shortwave broadcast channel. 2) MFSK16, which concentrates all
the data in a narrow column of data 316 Hz wide. This will be in
addition to our usual MFSK32 and MFSK64, with six MFSK64 images this

Here is the lineup for Shortwave Radiogram, program 146, 2-5 April 2020, in modes as noted:

1:50  MFSK32: Program preview
3:07  Olivia 64-2000**: Seismic impact of stay-at-home
7:41  MFSK16: Seismic impact continued
10:24  MFSK64: Harvesting energy from Wi-Fi
16:14  This week’s images*
27:48  MFSK32: Closing announcements

* with images

** Turn off Fldigi squelch (SQL) and choose receiver bandwidth
that will accept the data at 500 to 2500 Hz above and/or below
the carrier frequency (i.e. not too narrow)

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 | 13690 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.


Matt in Denver received these images 29 April 2020, 0800-0830 UTC, 5850 kHz from WRMI Florida. “Reception of the redeye WRMI 5850 broadcast was excellent as always, and that of 7780 on Sunday 2330z was as reliably abysmal, however the Olivia mode came in 100% on that latter broadcast.”


Fuente: Shortwave Radiogram, 2-5 April 2020: More strange radio experiments to pass the stay-at-home hours


Etiquetas:, , , , , ,

Deja una respuesta

Introduce tus datos o haz clic en un icono para iniciar sesión:

Logo de

Estás comentando usando tu cuenta de Salir /  Cambiar )

Imagen de Twitter

Estás comentando usando tu cuenta de Twitter. Salir /  Cambiar )

Foto de Facebook

Estás comentando usando tu cuenta de Facebook. Salir /  Cambiar )

Conectando a %s

Este sitio usa Akismet para reducir el spam. Aprende cómo se procesan los datos de tus comentarios.

A %d blogueros les gusta esto: