VOA Radiogram, 21-22 December 2013, celebrates the holidays with an experiment

VOA Radiogram, 21-22 December 2013, celebrates the holidays with an experiment

Even though we are in the midst of the holiday season, our experiments continue.

Our MFSK64 mode centered on 1500 Hz has data from 1000 to 2000 Hz, with a second audio harmonic from 2000 to 4000 Hz.

Technically, there is no overlap, but there is also no “guard band” between the fundamental and the second harmonic. This can cause interference, especially with less selective, lower cost receivers.

To determine if a guard band would be helpful, we will first transmit an MFSK64 image on our usual center audio frequency of 1500 Hz.

Then we will move the center audio frequency up to 1700 Hz. The fundamental will be 1200 to 2200 Hz. The second harmonic from 2400 to 4400 Hz. The guard band will therefore be 200 Hz wide, between 2200 and 2400 Hz.

Here is the lineup for VOA Radiogram, program 38, 21-22 December 2013:

1.  1:33  MFSK16: Program preview (2:58)
2.  5:40  MFSK32: Introduction to experiment (1:21)
3.  7:36  MFSK64/1500 Hz: Image of Christmas tree (2:05) 
4. 10:17  MFSK64/1700 Hz: Same image of Christmas tree (2:05)
5. 12:22  MFSK64/1700 Hz: Collapse of universe (3:39)
6. 16:15  MFSK64/1700 Hz/Flmsg*: Electronic waste, with image (3:26)
7. 19:41  MFSK64/1700 Hz: Converting algae to oil, with image (4:19)
8. 24:41  MFSK64/1500 Hz: Same image (1:46)
9. 26:38  MFSK32/1500 Hz: Closing announcements (:35)

*Use Flmsg with Fldigi. *To make Flmsg work with Fldigi (both can be downloaded from w1hkj.com), in Fldigi: Configure > Misc > NBEMS — Under Reception of flmsg files, check both boxes, and under that indicate where your Flmsg.exe file is located.

Please send reception reports to radiogram@voanews.com


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.

VOA Radiogram, 21-22 dicembre 2013 celebra le feste con alcuni esperimenti

Anche se siamo nel bel mezzo della stagione delle vacanze, i nostri esperimenti continuano in MFSK64 centrato su 1500 Hz e 1700 Hz

Ricevitore  in AM  Modulazione di ampiezza. Usate il software  Fldigi   http://www.w1hkj.com

Ecco la scaletta per VOA Radiogram, programma 38, 21-22 dicembre 2013:

1.        MFSK16    01:33: Programma di anteprima (02:58)  05:40
2.        MFSK32:  Introduzione di sperimentare (1,21)  07:36
3.        MFSK64/1500 Hz: Immagine di albero di Natale (02:05) 10:17
4.        MFSK64/1700 Hz: Stessa immagine di albero di Natale (02:05) 12:22
5.        MFSK64/1700 Hz : Collapse dell'universo (03:39) 16:15
6.        MFSK64/1700 Hz / Flmsg *: I rifiuti elettronici, con l'immagine (03:26) 19:41
7.        MFSK64/1700 Hz: Conversione di alghe al petrolio, con l'immagine (4:19) 24:41
8.        MFSK64/1500 Hz: Stessa immagine (01:46) 26:38 
9.        MFSK32/1500 Hz: Chiusura annunci (: 35)

 * Utilizzare Flmsg con Fldigi To make Flmsg  in Fldigi : Configure > Misc > NBEMS -- Under Reception of flmsg files, check both boxes, and under that indicate where your Flmsg.exe file is located.    Salva e Chiudi.

Calendario di trasmissione - Stazione trasmittente Edward R. Murrow in North Carolina US

1.                 Sab  1600-1630 UTC  17860 kHz 

2.                 Dom 0230-0300 UTC   5745 kHz   

3.                 Dom 1300-1330 UTC   6095 kHz 

4.                 Dom 1930-2000 UTC 15670 kHz  

VOA RADIOGRAM è particolarmente interessata a ricevere rapporti di ascolto eseguiti con   apparati radio portatili comuni.

Si prega di inviare i rapporti di ricezione, registrazioni, schermate  a:  radiogram@voanews.com

SOCI A.I.R.  sul report specificate che siete soci dell'A.I.R.

Visitate il sito voaradiogram.net troverete tutte le informazioni per i test  

Kim Andrew Elliott

Producer and Presente