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This weekend on VOA Radiogram, we will conduct one more experiment. We determined from last weekend's program that text in the MFSK64 mode centered on 1000 Hz, thus 500 to 1500 Hz, was not affected by the overlapping second harmonic at 1000 to 3000 Hz. The MFSK64 image that was centered on 1000 Hz showed some horizontal interference lines. Did the harmonic cause those lines? We'll find out by transmitting that same picture in MFSK64 centered on 1500 Hz, then 1000 Hz.
I think the problem with slant in the MFSK images has been solved. Nevertheless, at the beginning of the program, we will transmit a vertical line. In Fldigi, have the Configure > Sound Card > Settings box open to make any necessary adjustments while that line is transmitted.
There will be two VOA News stories in the robust MFSK32 mode this weekend. This will help cope with difficult reception, such as European listeners experience last weekend on 15670 kHz.
Here is the lineup for VOA Radiogram, program 36, 7-8 December 2013:
1:37 MFSK16: Program preview (2:32)
4:10 MFSK32: Slant alignment (1:34)
5:42 MFSK32: Capitol Christmas tree, with image (3:20)
8:48 MFSK32: Water on exoplanets, with image (5:50)
15:06 MFSK64: Image at 1500 vs 1000 Hz center frequencies (4:51)
20:06 MFSK64/Flmsg: Radio signals and space debris, with image
(5:01)
25:09 MFSK32: Closing announcements (:43)
Please send reception reports to radiogram@voanews.com
I will now get started answering your reports from last weekend's experiment-filled broadcast.
I hope to hear from you this weekend.
Kim
Kim Andrew Elliott
Producer and Presenter
VOA Radiogram
voaradiogram.net
VOA Radiogram transmission schedule
(all days and times UTC)
Sat 1600-1630 17860 kHz
Sun 0230-0300 5745 kHz
Sun 1300-1330 6095 kHz
Sun 1930-2000 15670 kHz
All via the Edward R. Murrow transmitting station in North Carolina.