[A-DX] LOG: 6070 kHz DigiDX#16, Multitrack 0530-0600z, O=3-4 (QRM mit Vatikan)

[Roger]

Am 05.06.2016 um 08:49 schrieb Roger:
> animierte GIF:
> https://app.box.com/s/8uizhjpnbpz789zypkoagpwml9239126
> (für Animation Download + externes Programm)



Hier die Olivia-16-500-Spur auf  2,2 kHz AF:
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<<2016-06-05T05:33Z OL 16-500 @ 6070000+2200>>


*DigiDX weekly schedule:*
Sunday 2130 - 15770kHz via WRMI (Okeechobee, FL, USA)
Sunday 2330 - 11580kHz via WRMI (Okeechobee, FL, USA)
Monday 2000 - 6070kHz via Channel 292 (Rohrbach Wall, DE)
Daily 0530/1830 - 6070kHz via Channel 292 (Rohrbach Wall, DE)

Any other extra broadcasts will be on http://www.digidx.uk

If you enjoy DigiDX and find the service useful please consider donating
via Paypal to 


*Latest Shortwave News:*

Radio Liberty in Russian (Radio Svoboda) to leave shortwave

After 63 years on the air, the Russian services of Radio Free Europe /
Radio Liberty is to stop broadcasting on shortwave on the 26th June. The
Radio Svoboda (meaning Freedom) programming will only remain on the
internet, satellite and on medium wave.

The last broadcast will probably be on 9540kHz from 21-22UTC on the 25th
or 26th of June.


*Extra broadcasts from IRIB Iran*

With the Islamic holy month of Ramadan starting on the 6th of June, IRIB
from Iran have added several extra broadcasts in Azeri, Arabic, Kurdish
and Turkish.

It is expected that some other broadcasters such as BSKSA Saudi Arabia,
Voice of Turkey and Radio Algeria will also add extra broadcasts between
June 6th and 5th July.


*Mighty KBC back to two hours*

While MightyKBC recently reduced its airtime to one hour on shortwave
every week at 0000 on Sunday, from Sunday the 12th June it will be back
to a two hour broadcast.

This will be on 9925kHz from the Nauen, Germany transmitter from 0000.


*VOA Burmese cuts*

 From the 4th of June many of the VOA Burmese shortwave broadcasts will
cease. 4 and half hours of broadcasts throughout the day will be
replaced by 2 hours on 2 frequencies.

Thank you for all the reception reports sent to  for
the usual broadcasts on WRMI and the extra broadcasts on Channel 292
every day. Please check out website www.digidx.uk and Facebook page
https://www.facebook.com/digidx/ for news of extra broadcasts.

The extra broadcasts on Channel 292 have given people in Europe (and
beyond) plenty of opportunity to experiment with decoding the text and
images using different equipment and methods. Merkouris (SV2HWM) in
Greece has emailed some of his observations about the image decoding.

Has anyone else noticed a difference between the size of the PNG image
file saved on their PC after two separate decodes of the same episode
and has the smaller file-size of the same image indicated a better
less-noisy decode?

On the extra broadcasts on 6070kHz at 0530, Fred Albertson in Virginia
USA emailed in to say that he managed to decode the May 31st broadcast.

This is Digidx signing off, please email 



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Zu den PNG-Bildern:

Generell kann man sagen:   Je kleiner die Dateigröße, desto geringer die 
Rausch-Anteile, desto besser das Bild.

PNG gehört zwar auch zur Gruppe der Rastergrafiken wie BMP, aber im 
Gegensatz zu Windows Bitmap gibt es hier Möglichkeiten der verlustlosen 
Datenkompression.

https://de.wikipedia.org/wiki/Portable_Network_Graphics

".....Komprimierung......................Die verlustfreie 
Datenkompression in PNG basiert auf mehreren, teils optionalen 
Verarbeitungsschritten. Zuerst können mit einem Vorfilter die Werte 
benachbarter Bildpunkte dekorreliert werden, um sie besser komprimierbar 
über eine Differenz zu Nachbarwerten beschreiben zu können. Dann kann 
mit einer Substitutionskompressionsmethode versucht werden, 
wiederkehrende Bildmuster zu erkennen und durch kürzere Rückverweise auf 
ein vorheriges Auftreten zu ersetzen. Abschließend wird eine 
Entropiekodierung angewendet, die Auftrittswahrscheinlichkeiten 
einzelner Werte ausnutzt, indem sie die Werte nach Wahrscheinlichkeit 
sortiert durch Codes variabler Länge ersetzt..."


Als Gleichnis:

unkomprimiert: WAV    -   BMP

verlustlosen Kompresssion.               FLAC   - PNG

verlustbehaftete Kompression            MP3     - JPG

Steuerdaten/Vektor-informationen:      MID     - SVG


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roger