Shortwave Radiogram listeners have kindly offered suggestions for experiments with our digital modes. Tobias in Germany suggests that eliminating the brief silence (about 0.6 second). between the text introduction of an MFSK image and the image transmission, can reduce or eliminate missed image headers. This is because there is no interval of silence that can result in random characters that might interfere with the header.
On this weekend’s Shortwave Radiogram, the silent gaps before the MFSK64 images will be eliminated. The gap will still exist between the text and the MFSK32 image near the beginning of the program.
Also, during most of the five-second delays after the RSID when modes change (to provide time for a manual mode change if necessary), 1500-Hz tones will be inserted instead of silence. This might eliminate the stray characters that can be annoying.
Here is the lineup for Shortwave Radiogram, program 211, 1-4 July 2021, in MFSK modes as noted:
1:41 MFSK32: Program preview
2:58 Christopher describes the heat wave in Oregon*
7:11 MFSK64: Hot nights hurt rice crop yields
10:51 This week’s images* **
28:35 MFSK32: Closing announcements
* with image(s)
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 | 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