Our first round of experiments with HamDRM is now complete. Thanks to Daz Man in Australia for converting our program 200 to HamDRM. When it succeeded, the result was the text of the program in html, with perfect images embedded. DRM is fussy about the quality of reception and receiving equipment, so often it does not succeed. But our experiments continue.
We also had our full schedule of transmissions in our usual hybrid system of MFSK digital modes via analog carrier. This method of transmission is very forgiving of less than ideal reception conditions. A few characters of the text might be garbled, but the general meaning is conveyed. The images might be fuzzy, but the subject of the photo can still be discerned. If not, it is nevertheless a visually interesting exercise!
We encourage you to try to decode Shortwave Radiogram via low cost radios (these for example), perhaps in addition to your usual sophisticated receiving gear.
A video of last weekend’s Shortwave Radiogram (program 201) is provided by Scott in Ontario (Sunday 0800 UTC on 5850 kHz). The audio archive is maintained by Mark in the UK Analysis (including the HamDRM) is prepared by Roger in Germany.
Here is the lineup for Shortwave Radiogram, program 202, 29 April-2 May 2021, in MFSK modes as noted:
1:43 MFSK32: Program preview
2:54 Climate change and the North Pole drift
6:54 MFSK64: World’s most powerful tidal turbine*
11:33 This week’s images*
28:10 MFSK32: Shortwave Radiogram
Please send reception reports to email@example.com
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 | 0030-0100 UTC | 9265 kHz | WINB Pennsylvania | | Friday | 1300-1330 UTC | 15770 kHz | WRMI Florida | | Friday | 1500-1530 UTC | 13655 kHz DRM | WINB Pennsylvania | | Saturday | 0100-0130 UTC | 9955 kHz | WRMI Florida | | Saturday | 0330-0400 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 7-9 pm EST) on 5960 kHz, via Germany. A minute of MFSK is at about 0130 UTC. Reports to Eric: firstname.lastname@example.org . See also http://www.kbcradio.eu/ and https://www.facebook.com/TheMightyKbc/.
Also this weekend, Daz Man writes: “I have some Ham-DRM data. Needed: EasyPal or WinDRM plus 7zip (Windows) QSSTV or TRXAMADRM plus p7zip (Linux) Data is Mode E, QAM4, 3 passes – also with 3dB PAPR processing to boost SNR.”
“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. email@example.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 1300 UTC on 3584 kHz USB, and the Pennsylvania NBEMS net Sunday at 1230 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 firstname.lastname@example.org , or tweet to @SWRadiogram, and I will let them know you are tuned in. USEast NBEMS Net: Please also note the USEast NBEMS Net, Thursdays 0000 UTC (Wednesdays 7 pm EST) on 3536 kHz USB.
Thanks for your reception reports!
Kim Andrew Elliott, KD9XB
Producer and Presenter
From Merkouris in Greece (creator of our waterfall ID), this reminder that fuzzy images can be charming. And 98% of the text decoded. On 25 April 2021, 2330-2400 UTC, 7780 kHz from WRMI Florida …