Hello friends,
The Shortwave Radiogram transmission Fridays at 0530-0600 UTC on 7780 kHz from WRMI Florida has been discontinued. WRMI is now signing off 7780 at 0400 UTC. The 0530 UTC broadcast never did attract many listeners, no doubt due to the inconvenient hour in the Americas. The unique feature of this broadcast is that it was almost always heard well in New Zealand. This is because of the 222Āŗ beam heading and the time of day. I should have done a better job of publicizing this transmission among New Zealand amateur radio circles.
Digital Radio Mondiale is a system that has been in existence since around the turn of the 21st Century. It provides Ā«FM qualityĀ» audio via shortwave — conditions permitting — as well as text and Ā«slideĀ» images. Our second news story this week is a DRM Consortium press release about a DRM shortwave teaching broadcast from the transmitter at Woofferton, England, to a school in The Gambia.Ā
I heard the broadcast using a KiwiSDR in southern Spain. The voice audio was good, with a couple of brief dropouts. The Journaline content was Ā«Error: expected NML Code 0x01, got 0x1aĀ». I don’t know if this was a problem in the transmission chain, or a quirk of the SDR. In any case, the press release is vague about how the teaching materials, other than the voices of the instructors, reached the students in The Gambia.
A shortcoming of DRM is that it voice and other content drop out when signal drop below a certain level, or when interference rises about a certain level. I.e., typical shortwave conditions.
The Shortwave Radiogram system of digital modes on an analog carrier has more survivability than DRM. SWRG does not do voice, but we can do text and images. The question is whether the images are clear enough to be useful to students in those distant, isolated places.
Ā
The DRM lesson was about triangles, so will also transmit two short paragraphs and an image of a triangle.
A video of last week’s Shortwave Radiogram (program 397) is provided by Scott in Ontario (Wednesday 1330 UTC). The audio archive is maintained by Mark in the UK. H0b0_Radio offers this IQ file. Analysis is provided by Roger in Germany.
Here is the lineup for Shortwave Radiogram, program 398, 17-23 April 2025, in MFSK modes as noted:
Ā 1:43Ā MFSK32: Program preview
Ā 2:57Ā MFSK32: State Dept closes anti-disinformation office
Ā 7:15Ā MFSK64: Digital Radio Mondiale shortwave learning event*
11:55Ā MFSK64: This week’s images*
27:58Ā MFSK32: Closing announcements
* with images
Please send reception reports to radiogram@verizon.net
And visit http://swradiogram.net
Bluesky: swradiogram.bsky.social
Twitter: @SWRadiogram or https://twitter.com/swradiogram
(visit during the weekend to see listenersā 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
Other Shortwave broadcast programs that include digital text and images include The Mighty KBC, Pop Shop Radio and Radio North Europe International (RNEI). Links to these fine broadcasts, with schedules, are posted here.
Thanks for your reception reports!
Kim
Kim Andrew Elliott, KD9XB
Producer and Presenter
Shortwave Radiogram
Reporting on international broadcasting at https://twitter.com/kaedotcom
Fuente: https://swradiogram.net/
CategorĆas:Broadcasting
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