[A-DX] Fwd: VOA Radiogram, 19-20 November 2016

[Roger]

Wenn Nonsens-Daten einen Sinn haben...... ;-)

Hintergrund:  Intermodulationen von Audio-Frequenzen bzw. Tracks. Hier 
z.B. DigiDX#8   mit  1500 + 2200 Hz simultan:
http://www.rhci-online.net/radiogram/VoA_Radiogram_2016-04-09.htm#DIGIDX

Konkret:
http://www.rhci-online.net/files/2016-04-10_2132z_MFSK32_1500+2200Hz-start.gif

Gut zu sehen das Erscheinen der Mischfrequenzen bei  700  und  3700 Hz  
mit Beginn der Spur auf 2200 Hz.....

Der schmale BPSK63F-Track (beim morgigen VOA radiogram)  genau auf dem 
360Hz-Brumm soll nun eine "saubere" Intermodulation  verhindern.
Es sollen die "Geister-RSIDs"  auf +/- 360 Hz gestört werden. 
(hoffentlich war die Absenkung der Stördaten um -15 dB nicht zu viel)

roger



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-------- Weitergeleitete Nachricht --------
Betreff      VOA Radiogram, 19-20 November 2016
Datum:     Fri, 18 Nov 2016 17:36:21 +0000
Von:     VOA Radiogram <>


Happy to report that our listeners Chris and Lorne in New Zealand are OK 
after Monday’s earthquake. Here is Chris’s decode of the oil made from 
sludge, transmitted Saturday, 12 November (before the quake), 0930-1000 
UTC, 5865 kHz
(Hier ist das Bild natürlich nicht dabei)


Hello friends,
I forgot to mention last week that for listeners in most of North 
America, VOA Radiogram is now on one hour earlier by local time, now 
that Daylight time has reverted to Standard time. The UTC times are the 
same.
Last week’s broadcast Sunday at 1930-2000 UTC on 15670 kHz was again 
inaudible in Europe. But, again, it provided good text and images to the 
western USA.
Possible solutions to the poor 15670 kHz would be a change to a 13 or 
maybe 11 MHz frequency at the same 1930 UTC time.
Or a change of broadcast time to dawn in Europe, around 0500 or 0600 
UTC, probably on a frequency near 6 MHz.
I am also considering a change the Sunday 0230-0300 UTC frequency to 
dusk in North Carolina, around 2300 UTC, for maximum night-time 
propagation to the east.
Please let me know if you have any thoughts about changing VOA Radiogram 
times and frequencies.


This weekend, we will try an experiment suggested by Roger in Germany.
As you know, the transmitter hum, most pronounced at 360 Hz, has mixed 
with the RSID, resulting in the Fldigi RxID flipping the audio frequency 
to ~1140 Hz rather than the correct ~1500 Hz.
Roger suggested transmitting “nonsense data” at 360 Hz, in addition to 
the primary data at 1500 Hz, to see if it prevents the intermodulation 
that causes the incorrect audio frequency. Or maybe it will make it 
worse. In any case, this should be fun.

Please follow this procedure for this weekend’s VOA Radiogram:
1.     Configure > IDs > ID > RsID > select Searches passband
2.     At 1:45 into the show, observe if RxID changes center frequency 
to 1140 Hz rather than the correct 1500 Hz. Change it back to 1500 Hz if 
necessary
3.     At 2:30, during the program preview, BPSK63F (PSK63F) at 360 Hz, 
reduced by 15 dB, no RSID, with the VOA Radiogram transmission schedule, 
will begin.
4.     At 2:56, the mode changes to Olivia 64-2000, with RSID. Observe 
if the audio frequency stays at the correct 1500 Hz or changes to 1140 
Hz.  Change the frequency back to 1500 Hz if necessary.
5.     At 10:03, the mode changes back to MFSK32, with RSID. Observe if 
the audio frequency stays at the correct 1500 Hz or changes to 1140 Hz. 
Change the frequency back to 1500 Hz if necessary.
6.     At 13:02, the BPSK63F at 360 Hz will end.

Here is the lineup for VOA Radiogram, program 190, 19-20 November 2016, 
all in MFSK32 except where noted:

  1:45  Program preview
  2:56  Olivia 64-2000: FUNcube enters amateur service
10:03  MFSK32: China increases Internet control*
17:29  Freedom House global Internet freedom report*
26:34  Closing announcements*
  * With image

  ................................................

Kim Andrew Elliott
Producer and Presenter
VOA Radiogram
voaradiogram.net
Twitter: @voaradiogram  (especially active before, during, and after 
broadcasts)

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