Shortwave Radiogram, 22-25 October 2020: Fun with Forward Error Correction

 

Apologies for the missing transmission Sunday, 18 October, 2330-2400 UTC on 7780 kHz. It’s an old WRMI transmitter, and such interruptions occur occasionally. The transmitter is back on the air now, and let’s hope it’s still operating this Sunday.

The B20 HF/shortwave frequency season begins 25 October. Many shortwave broadcast stations will change some of their frequencies on that date.As far as I know, the only Shortwave Radiogram frequency that will change is for the WINB DRM transmission Friday 1500-1530 UTC. As of
Friday 30 October, it will be on 13655 kHz.

Sunday, October 25 is also the day that most clocks in Europe are turned back one hour for winter time. WRMI stays with UTC, so from 25 October,Shortwave Radiogram will be one hour earlier by local time. The North American time change is not until 1 November.

Videos of last weekend’s Shortwave Radiogram (program 174) are provided by Scott in Ontario (Friday 1300) and by 2010DFS in Japan (Sunday 0800 UTC on 7730 kHz). The audio archive is maintained by Mark in the UK. (see also Mark’s video of his recently acquired vintage Panasonic RF-1405L receiver.) Analysis is prepared by Roger in Germany.

DominoEX22 experiment.
Roger in Germany has also suggested the experiment that will be
included in this weekend’s Shortwave Radiogram. Roger has decoded the
DominoEX22 featured on recent editions of This Is A Music Show (TIAMS),
but it is DominoEX22 without forward error correction (FEC). This
weekend’s DominoEX22 on Shortwave Radiogram will be divided into two
parts: the first without FEC, and the second with FEC. Will the presence
of FEC improve your decode in difficult reception conditions? You do
not need to make any adjustments to Fldigi between the non-FEC and FEC
segments. Just make sure the mode has been changed to DominoEX22. (For some listeners, the RSIDs transmitted by WINB do not work. Manually change to DominoEX22 and: Configure > Config Dialog > Modems > Domino EX > select FEC for the FEC segment.)

Here is the lineup for Shortwave Radiogram, program 175, 22-25 October 2020, in modes as noted:

1:41  MFSK32: Program preview
3:15  DominoEX22: Lesotho proposes social media limits**
9:30  MFSK64: Shortest event ever measured
11:44  This week’s images*
28:34  MFSK32: Closing announcements

* with image(s)

** The first 2:40 of the DominoEX22 is without forward error
correction (FEC). The final 3:32 of the DominoEX22 is with FEC.
You do not need to make any adjustments to Fldigi other than
changing the mode to DominoEX22 if the RSID did not change the
mode automatically.
(For some listeners, the RSIDs transmitted by WINB do not work. Manually
change to DominoEX22 and: Configure > Config Dialog > Modems >
Domino EX > select FEC for the FEC segment.)

* with image(s)

Please send reception reports to radiogram@verizon.net

And visit http://swradiogram.net

Twitter: @SWRadiogram or https://twitter.com/swradiogram (visit during the weekend to see listeners’ results)

Facebook group: https://www.facebook.com/groups/567099476753304

Shortwave Radiogram Gateway Wiki https://wiki.radioreference.com/index.php/Shortwave_Radiogram_Gateway

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 5960 kHz, via Germany. A minute of
MFSK is at about 0130 UTC.  Reports to Eric: themightykbc@gmail.com . See also http://www.kbcradio.eu/ and https://www.facebook.com/TheMightyKbc/.

“This is a Music Show” 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.
thisisamusicshow@gmail.com .  www.twitter.com/ThisIsAMusicSho/
@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. 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 radiogram@verizon.net , 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.

Andrew M0NRD in the UK received these images 16 October 2020, 1300-1330 UTC, 15770 kHz from WRMI Florida ...

 

Fuente: Shortwave Radiogram, 22-25 October 2020: Fun with Forward Error Correction



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