[A-DX] Fwd: VOA Radiogram for the weekend of May 4-5

[Harald Denzel]

73 Harald

Von meinem iPhone gesendet

Anfang der weitergeleiteten E‑Mail:

> Von: VOA Radiogram <>
> Datum: 2. Mai 2013 21:29:29 MESZ
> An: VOA Radiogram <>
> Betreff: VOA Radiogram for the weekend of May 4-5
> 

> Hello friends,
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> Thanks to everyone who sent reception reports, screenshots, audio samples, and other supporting materials after the VOA Radiogram of April 27 and 28.
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> During the weekend, the MFSK modes continued to prevail. The PSK63F transmission had the largest number of errors, according to your reports. A few of you reported better decoding from the Thor50x1 and Thor50x2 modes, but most of you had more success with the MFSK modes. Thor50x2 did not appear to decode better than Thor50x1, despite the extra bandwidth of Thor50x2.
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> In the next few weeks, we will be transmitting more MFSK32 and MFSK64, and comparing these two speeds of MFSK. MFSK64 (240 wpm) would allow us to put more information into a broadcast, but MFSK32 (120 wpm) would perform better in difficult reception conditions.
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> Last weekend, after using Flamp to transmit a VOA news story twice, some of you successfully received more than 90% but not quite 100% of the blocks. This weekend, we will use Flamp to broadcast a VOA news story three times. Please use Flamp 1.0.x.; the experimental version Flamp 2.0 is not compatible with Flamp as currently transmitted on VOA Radiogram.
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> The question for us is whether it makes sense to use Flamp (or similar future app) to transmit a news story two or three times using a fast mode like MFSK125, or just send the story once using a slower but more robust mode, like MFSK32 or MFSK64.
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> Here is the schedule of modes for the May 4-5 VOA Radiogram:
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> MFSK16: Program preview
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> MFSK32: Two VOA news stories
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> MFSK32: Image to accompany story to follow
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> MFSK32: VOA news story in Flmsg* format
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> MFSK64: Same VOA news story in Flmsg* format
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> MFSK128: Same VOA news story in Flamp* X3 format (compressed**)
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> MFSK16: Closing announcements
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> MFSK32: Image
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> An MFSK16 mode ID will precede each mode transmission.
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> All modes (except for one surprise mode) will be centered on 1500 Hz.
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> *Download Flmsg, Flamp 1.0.01, and Fldigi from www.w1hkj.com
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> **Because it is compressed, you will not see recognizable words during this Flamp transmission
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> Two interesting suggestions sent by listeners:
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> John Hoskins WA5NJG runs two instances in Fldigi during VOA Radiogram. One is set permanently to MFSK16 (no RSID) to receive the mode IDs. The other instance follows the modes being tested.
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> Ralph Wallio W0RPK suggests turning off Fldigi's AFC during VOA Radiogram. This will help keep the audio frequency on 1500 Hz, rather than chasing a noise up or down in audio frequency as sometimes happens with the AFC on.
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> Please send reception reports to  Audio samples of digital text that is successfully decoded during difficult reception conditions are especially helpful.
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> And visit voaradiogram.net
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> Twitter: @VOARadiogram   
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> VOA Radiogram transmission schedule
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> (all days and times UTC)
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> Sat 1600-1630 17860 kHz
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> Sun 0230-0300 5745 kHz
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> Sun 1300-1330 6095 kHz
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> Sun 1930-2000 15670 kHz
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> All via the Edward R. Murrow transmitting station in North Carolina.
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> Wishing you good decoding whether reception is good or not,
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> Kim
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