DRM Software Radio Forums  

Go Back   DRM Software Radio Forums > DRM Software Radio - User Forums > General Topics
User Name
Password
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 29-11-2018, 11:03   #1
tpreitzel
Registered User
 
tpreitzel's Avatar
 
Join Date: Apr 2012
Posts: 2,543
Digital and Analog SSTV, Digital Voice

Since there is a dearth of DRM broadcasts worldwide currently, I'll expand the potential list of digital transmissions from mediocre broadcasters to amateur radio operators.

I've been experimenting with DSSTV quite a bit lately. I do NOT like the hybrid mode since it seems to be replacing strictly digital transmissions. I don't have ANY need for an URL on the Spynet. DSSTV should allow the use of steganography which is an important capability in today's world. Here's a link to a paper on steganographic communication over radio:

https://link.springer.com/chapter/10...540-74124-4_14

Currently, I've been experimenting primarily with analog SSTV via MMSSTV and digital SSTV via EasyPal. QSSTV 9.2.6 seems to have problems decoding analog SSTV, but it seems to work alright for decoding digital SSTV transmissions. This problem with analog SSTV via QSSTV is probably due to the rather bizarre method of calibrating the sound-card. I'm also experimenting with DigTRX and FreeDV.

Primary DSSTV frequency in the USA is 14.233 MHz
Primary ASSTV frequency in the USA is 14.230 MHz
Primary DV frequency in the USA is 14.236 MHz, I think.

I've been monitoring lower frequencies as well, but traffic seems much to be significantly less at night. I wonder why.

DSSTV 7.173 MHz
ASSTV 7.170 MHz
DV 7.176 MHz

If you live outside the USA, feel free to post those usable frequencies as well and keep them updated if you can.

P.S. Yes, I'm running the Windows' programs via WINE, http://www.winehq.org, on GNU/Linux. WINE is pretty fabulous software today due to A. Julliard and the rest of the contributors.

Last edited by tpreitzel : 29-11-2018 at 16:03.
tpreitzel is offline   Reply With Quote
Old 03-12-2018, 16:55   #2
DRM-OM
Registered User
 
Join Date: Mar 2006
Location: SW Germany
Posts: 310
Did you ever have a look at this: http://voaradiogram.net/
__________________
greetings ...

some german language info pages on DRM

Last edited by DRM-OM : 18-03-2019 at 17:21.
DRM-OM is offline   Reply With Quote
Old 03-12-2018, 20:04   #3
tpreitzel
Registered User
 
tpreitzel's Avatar
 
Join Date: Apr 2012
Posts: 2,543
Quote:
Originally Posted by DRM-OM
Did you ever have a look at this: http://voaradiogram.net/

Yep. This project is now hosted primarily on http://swradiogram.net. Functionally, it's "analog" SSTV with text. The results are similar too. I don't really know if an acceptable "digital" mode can be found for this project and still use it over analog shortwave. Personally, I'd love to see the day as the DRM standard is also slightly revised to eventually include automatic digital fallback modulation along with the addition of 4 QAM modulation, i.e. 64, 16, 4 QAM and then silence. Personally, I'd like to see the radiogram project effectively compete with DRM, but to do so would almost transform the radiogram project into an already existing digital standard like DRM.

Last edited by tpreitzel : 04-12-2018 at 00:00.
tpreitzel is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is On
Forum Jump


All times are GMT. The time now is 02:37.


Powered by vBulletin Version 3.5.3
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.