Shortwave Radiogram, del 1 al 6 de Junio: programa 307

Shortwave Radiogram
Shortwave Radiogram

This weekend on Shortwave Radiogram, we will experiment with three flavors of
MFSK: MFSK16 (60 wpm), MFSK32 (120 wpm) and MFSK64. We use MFSK32 and MFSK64 most weeks. MFSK16 is slow, but it is often successful in poor reception conditions.

Bad reception can actually be useful this weekend, because it allows us to test
the limits of MFSK16. One caution about MFSK16 is that the audio frequency must be tuned precisely. Generally, the RSID will set your Fldigi or TIVAR/Andflmsg to the correct audio frequency. If that does not work, adjust the audio frequency until a successful decode is achieved.

In addition to comparing the text decoding performance of the three MFSK modes, we will also send the same image three times, once each in MFSK64, MFSK32 and MFSK16. You will notice that the image takes about the same amount of time to transmit in all the modes. The resolution of the images will differ, however: MFSK64 will be the most crisp, but also susceptible to interference lines. MFSK16 will be fuzzier but less degraded by interference.

Here is the image in “studio” quality …


Here is the lineup for Shortwave Radiogram, program 307, 1-6 June 2023,
in MFSK modes as noted:

  1:40 MFSK32: Program preview
  3:08 MFSK16: Batteries, EVs and the environment
  7:39 MFSK32: Batteries article continues
10:18 MFSK64: Batteries article continues
12:59 MFSK64: Image of Crimson Rosella (parrot)
14:40 MFSK32: Same image of Crimson Rosella
16:44 MFSK16: Same image of Crimson Rosella
19:16 MFSK64: This week’s images
28:35 MFSK32: Closing announcements

A video of last weekend’s Shortwave Radiogram (program 297)  is provided by Scott in Ontario (Friday 1300 UTC).

The audio archive is maintained by Mark in the UK

.Analysis is prepared by Roger in Germany.

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       |
| Friday   | 0030-0100 UTC | 9265 kHz         | WINB Pennsylvania |
| Friday   | 0530-0600 UTC | 7780 kHz         | WRMI Florida      |
| Friday   | 1300-1330 UTC | 15770 kHz        | WRMI Florida      |
| Friday   | 1500-1530 UTC | 15755 kHz DRM    | WINB Pennsylvania |
| Saturday | 0330-0400 UTC | 9265 kHz         | WINB Pennsylvania |
| Saturday | 2300-2330 UTC | 7570 kHz         | WRMI Florida      | 
| Monday   | 0800-0830 UTC | 5850 kHz         | WRMI Florida      |

The Mighty KBC transmits to Sundays at 2200-2400 UTC (5-7 pm EST) on 5950 kHz from WRMI Florida. A minute of MFSK64 is at about 2330 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 MFSK-64 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). Also look for a waterfall ID at the beginning of the show.    @ThisIsAMusicSho

Pop Shop Radio from British Columbia, Canada, includes “a whole variety of pop music, such as records from the 1960s and 1970s that were played on Top-40 radio stations not only in North America but also on offshore radio and stations like Radio Luxembourg.” The programs now include some MFSK text and an image. Website: Twitter: @popshopradio1  Email:

Thanks for your reception reports!


Kim Andrew Elliott, KD9XB

Producer and Presenter

Shortwave Radiogram




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