RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > HF / MW / LW Monitoring > Shortwave Data Decoding


Shortwave Data Decoding - Discussions regarding decoding digital signals on the HF bands, including HFDL, ALE, RTTY, CW, and others.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 09-30-2007, 7:53 PM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jun 2004
Location: Gwinett, GA
Posts: 126
Default Drm

I am listening to the DRM signal from Sackville NB, Canada 9790 kHz - wow! Using a WiNRADiO G305 with M-Audio desktop speakers the sound is so good you wouldn't know it from FM.

So far I've only heard a few DRM stations and it is all or nothing but very impressive when it does come in.

Wondering who else is monitoring DRM and what results you've had?
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 10-01-2007, 2:05 PM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jun 2004
Location: Gwinett, GA
Posts: 126
Default DRM yawn...

I knew this would be a fascinating, wildly popular thread...
Reply With Quote
  #3 (permalink)  
Old 10-01-2007, 2:23 PM
Wiki Admin Emeritus
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jul 2002
Location: Bowie, Md.
Posts: 21,035
Default

Of course, it would help if you told them what you were talking about!

DRM stands for Digital Radio Mondiale. It is a mode that is somewhat similar to IBOC in intent - it provides more fidelity to a HF signal, giving it an almost FM type sound. It's being touted as the way to bring SW to the masses - we all know that under normal conditions, a HF signal, even if it's very strong, is limited in that department.

As such, a DRM signal tuned on a regular receiver is nothing but noise. Therein lies the problem for folks that tune for weaker stations that are sometimes nearby - the sidebands tend to completely clobber them. In addition, with the exception of the Winradio series, there are no mass-produced radios currently in North America that can receive this mode. RadioIntel has had news in the past of portables set up for this, but they are generally coming out of China, or one of the Euro markets. There's no market for DRM here in the States yet, and without some education and heavy marketing, it's not gonna happen.

To receive a DRM signal, you need to tap the detector output (sound familiar? Yes, it's not unlike tapping a discriminator off a scanner to run programs like UniTrunker). There are software packages available to copy this - one called DReaM has been floating around for some time, another used by the WinRadio folks (I believe there is more than 1 version...).
Some WinRadio receivers are already set up for this, and can run their software without modifications. Anyway, not all radios seem to have the ability to feed a signal correctly, even with a detector tap.

For more detailed information and descriptions, see the bottom of:

http://www.radiointel.com/radioinfo.htm

Look at the center of the page for the DRM resources. And pray it doesn't come to a station near you.....

73s Mike
__________________
co-author, HF Digital Decoding
HF Forum moderator, RadioReference
Friends don't let friends buy Scancat Lite Plus!
Reply With Quote
  #4 (permalink)  
Old 10-01-2007, 3:40 PM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jun 2004
Location: Gwinett, GA
Posts: 126
Default

I didn't realize there were no receivers with DRM other than going through all that.
It sounds good but I can see how badly it would affect other non-DRM signals. Lets hope it stays out of the US - looks like it will.

Next I plan to ask if anyone here has flown the space shuttle and how the stereo sounds...
Reply With Quote
  #5 (permalink)  
Old 10-01-2007, 6:39 PM
radio50's Avatar
Member
   
Join Date: Jul 2007
Location: Mequon, WI
Posts: 134
Default Yup, I'm listening to DRM

I've been using a WinRadio 313e USB external software-defined receiver for a few months to listen to DRM. It has pretty amazing sound quality, but, as with many types of digital signals, if it starts to fade, it just goes away completely.

I have found the best signals into the Midwest USA to be from Sackville in Canada, in the evening. Attached is an example from a few minutes ago. I just have the little antenna included in the radio box, and really need something better. As you can see, the signals are not bad, but could be better. My biggest problem is electronic noise from inside my house.

The DRM signal appears to extend about +/- 5 kHz from the assigned frequency, so as other posters have mentioned, if there's something 5 kHz away, it's going to have one of its sidebands clobbered. A synchronous demodulator could receive a normal AM SW station on its other sideband, perhaps.

So, there are a few of us out here listening to DRM, to answer your original question.
Attached Images
 

Last edited by radio50; 10-01-2007 at 6:44 PM..
Reply With Quote
Sponsored links
  #6 (permalink)  
Old 10-01-2007, 7:41 PM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jun 2004
Location: Gwinett, GA
Posts: 126
Default

Very nice! I'd like to step up to the G313e - looks like a great receiver.
Reply With Quote
  #7 (permalink)  
Old 10-03-2017, 9:10 AM
xe2kaf's Avatar
Member
   
Join Date: Jul 2010
Location: Playa del Carmen, Quintana Roo State, México.
Posts: 39
Default

Hello everyone,
I'm a beginner in decoding DRM with Dream software. I have downloaded it but it does not work correctly and when I detect a station (in 7.214.910 Mhz) it tells me that I do not have "codec available" I've been trying to search a lot about this program but every time I find it more complicated because according to what I read I need to make some compilations and modifications to the program. Anyone know anything about this?. I'm using Windows 10, SDRplay 1, SDRuno with VB cable. I detect but can not decode anything
Thank you in advance of Jesus
xe2kaf
Reply With Quote
  #8 (permalink)  
Old 10-03-2017, 10:25 AM
mcscanner's Avatar
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Dec 2002
Location: Lewisville, TX
Posts: 681
Default

Old thread...

Check the attached link if you have not already seen it. My quick scan of that webpage suggest you have all the pieces you need. I believe the complications and modifications you speak of are really just typical setup and configuration to get all the pieces to work with each other.

It will NOT auto configure and plug-and-play without your hands on selections.

A brief overview using DSD+ to decode digital Public Service & Business which likely is similar to your needs.

On the Air Signal <-- Tune SDR to correct frequency
SDR radio <-- Select bandwidth & radio's internal demodulation
SDR radio <-- redirect radio's demodulated audio to input of Virtual Audio Cable (VAC)
VAC <-- output of VAC redirected to DSD+ (this is the codec)
DSD+ <-- codec displays information in various windows (digital information)
DSD+ <-- decoded audio is redirected to your computer's speakers

Your setup will likely be similar, but I'm not familiar with Dream or DRM and your computer setup will impact which path the audio will take.

There is only one correct way to setup and maybe 10 places to make the wrong selection/setting and nothing heard.

Good Luck,
Mike

https://www.rtl-sdr.com/tutorial-drm...using-rtl-sdr/
__________________

The road goes on forever and the party never ends...
Reply With Quote
  #9 (permalink)  
Old 10-03-2017, 9:16 PM
Member
  RadioReference Database Admininstrator
Database Admin
Amateur Radio Operator
Amateur Radio
 
Join Date: Nov 2002
Location: Boston, Ma
Posts: 2,146
Default

Hello,

You need to get the right audio codec that can not be distributed with the Dream software. See this page for more info.
https://www.rtl-sdr.com/tutorial-drm...using-rtl-sdr/

73 Eric
Reply With Quote
  #10 (permalink)  
Old 10-04-2017, 9:29 AM
xe2kaf's Avatar
Member
   
Join Date: Jul 2010
Location: Playa del Carmen, Quintana Roo State, México.
Posts: 39
Default

Thank you very much for the tips mcscanner and EricCotrell.
I've installed faad2_drm.dll and added it to the Dream software folder.
In my Dowloads directory I have other folder called:
faad2-2.7 and this includes other folders as:
aacDECdrop
common
frontend
include
libfaad
plugins and files like: AUTHORS, bootstrap, ChangeLog, configure.in, COPYING, faad2.spec.in, in_mpeg4aac.nsi, Makefile.am, NEWS, README, README.linux, TODO.
What should I do with this program that apparently is the version 2.7? I must also included it in the Dreams folder or not ?. So far I have come to detect the broascast in 7.214.910 (TSR Tiganesti E2) as I said but now it don't appear "no codec available" any more, and it detects it well, but I do not have audio from the station yet , apparently I need a stronger signal. Anyway Thanks for the advice and tips of Jesus
xe2kaf

Last edited by xe2kaf; 10-04-2017 at 9:34 AM.. Reason: erros of language
Reply With Quote
  #11 (permalink)  
Old 10-04-2017, 9:41 AM
mcscanner's Avatar
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Dec 2002
Location: Lewisville, TX
Posts: 681
Default

Quote:
Originally Posted by xe2kaf View Post

...snip...
as I said but now it don't appear "no codec available" any more, and it detects it well, but I do not have audio from the station yet , apparently I need a stronger signal. Anyway Thanks for the advice and tips of Jesus
xe2kaf
Your post suggest the codec is in place and getting input with the "detects it well" comment. The output (audio) of the codec should be connected / routed to you computer sound card speakers.

Again I am making recommendation based on my DSD+ setup. I expecting it would have similar requirements to your.

Mike
__________________

The road goes on forever and the party never ends...
Reply With Quote
  #12 (permalink)  
Old 10-04-2017, 10:23 AM
xe2kaf's Avatar
Member
   
Join Date: Jul 2010
Location: Playa del Carmen, Quintana Roo State, México.
Posts: 39
Default

Sorry if I can not express myself well in English, but I will try to find the appropriate words:
Effectively the codec is already in place.
I mean that in the frequency I mentioned the program Dream detected the station I said but I no longer see the error message "no codec available" again, and the data of the broadcast data appeared (TSR Tiganesti E2) in Dream program (any data appeared before), but for the moment I do not hear the voices of the transmission (news or music etc) only the classic noise of the DRM carrier. In SDRuno I have VB cable and I have piped it to the settings of Dream in the sound card as it says in the web page that you sent me (https://www.rtl-sdr.com/tutorial-drm-radio-using-rtl -sdr /) sound card --- signal input ---- device --- VB Cable. And I have set the Audio Output --- device --- speakers (Conexant Smart Audio)
(msscanner thanks for the suggestion of DSP +
I expect Eric's advice about Dream as well.
de xe2kaf
Reply With Quote
  #13 (permalink)  
Old 10-04-2017, 10:55 AM
mcscanner's Avatar
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Dec 2002
Location: Lewisville, TX
Posts: 681
Default

Trust me that your English is way better than my Spanish.

Setting up Virtual Audio Cables can be a little confusing. You hear the sound of the raw audio and I draw two conclusions from that. SDR audio is connected to your speakers or the codec (Dream?) is connected but is not decoding the data stream for some reason. There might be two data streams, the text displayed and the audio not yet heard.

At this point I think with a little more work with the documentation you have and trying different configuration you will get it to work. For me Dream is a black box I know nothing about. Like is it the codec and if so is there something missing.

Take time to read over the link we supplied many time slowly and carefully. It is easy in technical writings to miss a significant point made, even for us primary English speaking person.

Mike
__________________

The road goes on forever and the party never ends...
Reply With Quote
  #14 (permalink)  
Old 10-05-2017, 4:25 PM
xe2kaf's Avatar
Member
   
Join Date: Jul 2010
Location: Playa del Carmen, Quintana Roo State, México.
Posts: 39
Default

EricCotrell
Do you have any other opinion of any setting in Dream? i piped the Audio in to VB cable but lety the Audio out to speakers is that right?
Thanks
Xe2kaf
Reply With Quote
  #15 (permalink)  
Old 10-07-2017, 8:07 AM
Member
   
Join Date: Jul 2016
Location: Bothell, WA
Posts: 250
Default

xe2k2af, here's my copy of Dream. Try using this one:

https://www.dropbox.com/s/q305o7enww...ream.zip?raw=1

Also, it's possible your SDR software doesn't have a "DRM" specific mode -- which most that support DRM -- do have one. DRM requires specific settings for it to be used correctly.

Lastly, DRM decoding requires near-perfect signals. If you have a lot of noise and/or not enough signal strength, then Dream will not decode very well -- if at all.
Reply With Quote
  #16 (permalink)  
Old 10-07-2017, 9:05 AM
xe2kaf's Avatar
Member
   
Join Date: Jul 2010
Location: Playa del Carmen, Quintana Roo State, México.
Posts: 39
Default

devicelab:
Thank you, I downloaded it, I'll try it. As I said the software I use is SDRuno and Console V3 (mainly) with SDRplay 1, they detect more or less well the signal because I do not have a good antenna for now (I'm using a small active indoor antenna mfj-1022 but in Norway!), but this next Monday I will be in Mexico with better equipment. I still thank you very much.
I'll let you know 73's of jesus
xe2kaf
Reply With Quote
  #17 (permalink)  
Old 10-07-2017, 1:53 PM
xe2kaf's Avatar
Member
   
Join Date: Jul 2010
Location: Playa del Carmen, Quintana Roo State, México.
Posts: 39
Default devicelab

I think the problem in Dream is in the settings, I am including 3 attachments files so you can see how it is configured, something wrong?. As you see Dream detect signal but I can not hear more than the noise of the signal carrier. Thanks and 73's de
xe2kaf
Attached Images
 
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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 12:26 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2015 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions