DRM transmitter SPARK

[30CB638E]

Hello!!
I've resolved the audio speeding problem: I've changed the mono .wav input file for a stereo .wav file, and the audio now goes well

But when I play the stream in Sodira, the audio stops, continues, stops.. like when there's not enough signal. It's normal ?

[simone]

Hi 30CB638E,

Originally Posted by 30CB638E

But when I play the stream in Sodira, the audio stops, continues, stops.. like when there's not enough signal. It's normal ?

What´s your CPU load when this problem occurs?
Simone

[dadalbinder]

Hallo,

it is very convenient to transfer an actual AM-station to DRM-WAV-File by Spark.

The size is growing a lot but You are on this way able to send a WAV-File to a station to document the AM-receiving.

It seems to be practical to use WAV-Files, because is the simpliest and best procedure to use the programm quite well.

If You use SOUNDCARD there is the need of a lot of installations for the audio-streams in You computer. After You are on the safe side to manage WAV-Files You could have Your experiences with the Soundcard-option.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

receiving REE Noblejas in DRM-mono, and in DREAM and its SNRs.

Wolfgang Hartmann, Nürnberg

[30CB638E]

Hello!
Sorry for the post delay...

What´s your CPU load when this problem occurs?
Simone

As you can see in the attached photo, the CPU load is arround the 20-30%, with peaks of 50%.

Hallo,

it is very convenient to transfer an actual AM-station to DRM-WAV-File by Spark.

The size is growing a lot but You are on this way able to send a WAV-File to a station to document the AM-receiving.

It seems to be practical to use WAV-Files, because is the simpliest and best procedure to use the programm quite well.

If You use SOUNDCARD there is the need of a lot of installations for the audio-streams in You computer. After You are on the safe side to manage WAV-Files You could have Your experiences with the Soundcard-option.

I can transfer an AM Station to a DRM ? How ? Recording the AM audio into a .wav file and then converting it to DRM with Spark ?
There's no problem with .wav files, exept the "stop-play-stop-play..."
I hope that I will receive REE in DRM mode. In AM , I can tune REE with a power of 10/10 using a Sangean ATS909

[dadalbinder]

Hallo,

I had a view on the screen.

This shows a symmetrical constellation in SoDiRa.

My first question: Which receiver at CONFIG-menu in SoDiRa are You using?

It seems for me, You are using: COMMON REAL as receiver type in SoDiRa?

The zero-position of the sound is dominated by a big noise amount. And the left and right channel are symmetrical identical.

By which receiver are You receiving?
DRT1 , Elektor_USB, Common Real, Common IQ within SoDiRa or
from a receiver at Your desk, generating a wav-file for use in SPARK?

SPARK has the feature, to work from a Mono-file (FAAC) or from a signal from an audio-stream within Your computer, by receiving through SoDiRa.

This as first step.

Please give me the informations.

Wolfgang H.

[dadalbinder]

Hallo,

it seems, that there are a lot of problems combined with starting SPARK.

The author gives the recommendation of the following main steps in this order:


1.DRM-Systemkonfiguration = DRM configuration first

2.MSC-Konfiguration (Multiplexer und Services) = following Multiplexer and Services

3.Ausgabegerätekonfiguration = Output constellation

Using this advice will not force You to change parameters later.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

it is very impressive, to see the original SNRs while decoding REE Noblejas 9780 kHZ in DRM-MONO and in the generated WAV-file by SPARK 1.7.0.

Receiving the original transmission gives several SNRs. The quality of the audio stream is optimal but the SNRs could be a lot of varieties.

After taking this output by the normal transmission, one gets extremly better SNRs by the generated WAV-file.

Two screens show the situation.

Receiving and Playing by SoDiRa version 0.063

Wolfgang Hartmann, Nürnberg

[30CB638E]

Hello!

I'm sorry, I couldn't post because I was on holiday.

I've configured the Spark and Sodira and now it works perfectly

[30CB638E]

Hi!

Does anybody knows how to make a DRM transmitter ?

[maxpower]

Hi!

Do you have some experience with HF and pcb-layouting? Its not too difficult to build a small drm tx.

Where do you need it for? Inside your Home use or a real (Ham-)TX?

Simplest way should be a direct mixer (ne612 for example) and a crystal generating drm-hf direct from the soundcard output. But you'll have a image that you will produce also.

Better way would be a I/Q Mixer, but you ll have to generate a good I/Q signal to minimize Images.

Feel free to contact me via PM.

Stephan


Stephan

[30CB638E]

Have you received my PM?

[dadalbinder]

Hallo,

beim Einsatz von SPARK, das ich jetzt auch für die Generierung von DRM+ einsetzen möchte, irritiert mich eine Eigenschaft von SPARK, die ich noch nicht voll steuern kann:

Übernimmt man ein dekodiertes Signal einer Station, so kann das bei Benutzung von SoDiRa auch problemlos als WAV-File generiert werden.

Bei 2 vorhandenen Soundkarten auf meinem Rechner besteht aber die Eigenschaft, daß beim Versuch, Audiodateien in kleine Testfiles abzuspeichern, daß für den Eingang der Output einer anderen Soundkarte benutzt wird. Ergebnis ist, daß die Files leer sind bzw. nur Rauschgeräusche aufweisen.

SPARK selbst hat keine Steuerung bzw. Einstellmöglichkeit für die Audioströme, gibt es ein alternatives Verfahren?

Ich grüße

Wolfgang Hartmann

[dadalbinder]

Hallo,

in the meantime, there is the opportunity, to generate DRM+ or DRME signals into output to soundcard or wav-file.

As far as I know, there is no possibility to decode DRM+ by DREAM. But there is an opportunity to decode these streams by a special version of SoDiRa.

One has to write to Bernd Reiser, autor of SoDiRa to get an experimental first decoding special version of the programm.

With regards

Wolfgang Hartmann

[gccradioscience]

I have tried Spark before and its really good to use for computer to an mp3 player use. I am experimenting with the Spark software on a part 15 AM transmitter, but I might just build another kit. I think this is great, but I can only do mono audio, is it true that if you get a licensed version you can do stereo casting? The reception from another radio is not here yet, I have to get a C Crane SW with a DRM 455 kHz to 12 kHz down converter to connect to the computer in the next room to test it out more.