DRM transmitter SPARK

[simone]

Hi all,
another interesting project at University of Kaiserslautern/ Germany:

DRM transmitter SPARK (http://www.drm-sender.de/)

Simone

[PP5AZF-Ataliba]

Estou procurando SPARK com DRM+ e não estou achando?
Alguém conhece algum outro software gratuito que eu possa fazer alguns testes de transmissão DRM e DRM+ (MW, SW e VHF)?

Translation portuguese - english "Google"

Looking for SPARK with DRM + and I am not thinking?
Does anyone know of any other free software that I can do some testing of transmission DRM and DRM + (MW, SW and VHF)?

[maxpower]

Hi!

I think spark is the only DRM & DRM+ Software Transmitter so far. But I think "only" the DRM version of the software is available. Does anybody got the + Version to test by now?

Apart from that you can use Dream in the Transmitter-Mode, but it can only encode DRM (SW/MW) FAAC.

Google Translation:

Penso que é a única faísca DRM & Software DRM + Transmissor tão longe. Mas penso que "apenas" o DRM versão do software está disponível. Alguém teve a + Versão para testar por agora?

Para além de que você pode utilizar o transmissor no Dream-Mode, mas ela só pode codificar DRM (SW / MW) FAAC.


Stephan

[PP5AZF-Ataliba]

Eu acho que não existe a versão DRM+ do SPARK. Eu soube que foram feitos alguns testes com FM e DRM+ em 87,6 mhz mas não sei qual foi o software utilizado:
"Positive Results From DRM+ Tests on FM - Kaiserslautern, Germany – Positive tests results using the DRM+ standard for a radio station broadcasting on FM have been unveiled at an international symposium today. "
http://www.drm.org/news/detail/news/positive-results-from-drm-tests-on-fm/

Translation portuguese - english "Google"

I think there is the version of DRM + SPARK. I learned that some tests were made with DRM and FM 87.6 MHz + in but I do not know what was the software used:
"Positive Results From DRM + Tests on FM - Kaiserslautern, Germany - Positive tests results using the DRM + standard for a radio station broadcasting on FM have been unveiled at an international symposium today."
http://www.drm.org/news/detail/news/positive-results-from-drm-tests-on-fm/

[dadalbinder]

Hallo,

I got a version from the TU Kaiserslautern.

After some tries it works. In this case: receiving AM6155 kHz and converting it by SPARK to a DRM-file.

One has to find 2 DLLs to work with the programm. All information is given in this thread.

Wolfgang Hartmann

[dadalbinder]

Hallo,

one has to find the 2 dlls necessary for full function of the programm:

F_aac.dll and mscvr711.dll

Who knows the best sources?

Wolfgang Hartmann, Nürnberg and 2 more screens

[dadalbinder]

Hallo,

SPARK is able to convert an audiostream (MONO) into a DRM-file or deliver the DRM-stream to a second soundcard output. You are able in a continous demonstration to engage DREAM for decoding from an audio signal from the computer. You can decode an AM-signal by receiving or to use an audio-stream (MONO) for generating DRM.

Very impressive programm. One has to read all the informations very clearly, You get a lot of hints.

There is no possiblity to get a dll by former Coding Technologies now Dolby Germany. Because of that, one is not able to generate a DRM-STEREO-file.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

if the signal at the marked line is to high, You will get as an example a text message but no working audio-modulation in the DRM-stream.

Have a look at: too_High_03

Wolfgang Hartmann

[dadalbinder]

Hallo,


Die AAC+ DLL ist nach Aussage des Autors, Michael Feilen, in keinem Programm enthalten.

Damit sind die Möglichkeiten DRM in Stereo zu generieren, erst einmal auf eine unbestimmte Zukunft verlagert.

Die Möglichkeiten von Mono-Arbeiten ist weiter gegeben.


Wolfgang Hartmann

[dadalbinder]

Hallo,

eine lustige Sache, REE direkt zu empfangen, umzusetzen auf WAV-File und durch SoDiRa mit Elektor_USB Empfänger umzusetzen.

REE02 im Appendix zeigt die Empfangssituation im normalen Betrieb.

REE01 die Situation beim Abspielen des WAV-Files.

Im letzten Screen kann sehr schön das Signal um die 0-Position der Soundkarte beobachtet werden. Der Bereich ist mehrere hundert Hertz breit.

Ich grüße, es folgt ein zweiter Teil mit der Möglichkeit die erzielten SNRs abzulesen.

Wolfgang Hartmann

[dadalbinder]

Hallo,

hier der zweite Teil mit Angabe der erzielten SNRs. Sie korrespondieren mit den Screens in der ersten Info.

REE sendet original in Mono. Deshalb ist die Übertragung in das WAV-File mit neuer Textmessage möglich.

Die DLL AAC+ bleibt weiter ein Desiderat, wünschenswert, um das Programm voll fahren zu können.


Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

Ergänzung: Empfang mit SoDiRa und Bearbeitung durch SPARK und Ausgabe direkt auf DREAM.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

the version 1.70, I got recently, includes the DRM+ mode.

It includes the modes A, B, C, D and the mode E (DRM+)

Have a look into the appendix.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

some examples of slideshow ability of Spark. Transverted into DREAM and its MM features.

It containes some screens of the programm while installing and running.

Because of the limitation of appendix files, I will send 2 ones and after that 2 more ones.

Wolfgang Hartmann

[dadalbinder]

Hallo,

two files in the appendix following

Wolfgang Hartmann

[30CB638E]

Hello!

I'm testing the SPARK software, but I'm blocked in one step:
When you're in the "Multiplexer" window and you want to set the FAAC (audio) settings , the program ask you what bitrate have to have the FACC. Then, I choose 22.14KBit/s, and the program closes.
How I can resolve this problem ?
Do I have to download any extra .dll ? I'm looking to download the F_AAC.dll, but i can't find it.
If I try the line out output, I've to connect it to the microphone input of the transmitter to broadcast in DRM ??

Thanks!

This is my first post in an english forum, so sorry if my English is not very good.

[dadalbinder]

Hallo,

You should have all the dlls. I am not so exeprienced, to know every detail.
I would think, stopping of the programm says, the programm is missing some dll.

In Deutsch: Zuerst muß man wohl die DLLS zusammen haben. Manchmal ein schwieriges Problem, wo man sich Rat holen bei anderen Computernutzern.

Wenn das Programm stoppt, scheint ihm eine DLL zu fehlen.

Wolfgang Hartmann, Nürnberg

[30CB638E]

Hello!

I've tested the SPARK software in an other computer (with WindowsXP , not with WindowsVista) , and it let me create a FAAC stream (or it seems like that).

When you unzip the program folder, there's (a part of the .exe ) two DLL ; one called fft and the other called faac. Why I have to download the f_aac.dll from internet if already I have it in the SPARK folder ?
Another thing is that you've to register a .dll called msvcr71, but when I try to register it, the system says me that : "msvcr71.dll has been downloaded, but the point of entry DllRegisterServer was not found . It is not possible to register this file."
What can I do ?
When I try the line out output, I've to connect it to the line-in of the transmitter ?

Thanks!!

[dadalbinder]

Hallo,

the software seems at the moment not to be running under Vista.

If You got DLLs, use them. If You have a dll on Your machine, You need not to download the same procedure.

I have the same behaviour with msvcr71,dll. The programm works under this circumstance.

The first step should be to work with Spark into a wave file and decode it later with SoDiRa or DREAM.

The last question I do not unterstand quite well. Please could You explain?
Do You receive the stream by DREAM? Do You see the spectrum on a spectrum analyzer programm?

I will try to get an explanation about msvcr71.dll and report, if I get an answer.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

the author, Michael Feilen, has given me a hint for a video giving an example of direct modulation and receiving it with a Morphy Richards receiver directly.

His notes are:

Weiterhin fände ich es nützlich, wenn im DRM-DX forum folgendes Video
verlinkt wäre:
http://www.youtube.com/watch?v=1BCYWH6b_N4
Es zeigt die Möglichkeit, mit der kostenlosen Version von Spark und
einer PCI-Karte von National Instruments (ca. 800 EUR) das RF-Signal
direkt per DAC auf bis zu 1,4 MHz zu modulieren (invertiert auf bis zu
2,8 MHz) und so Langwellenfunk ohne weitere Mischvorgänge zu
realisieren. Man benötigt lediglich einen Tiefpass-(bei invertiertem
Signal einen Bandpass)-Filter, einen linearen Verstärker und eine Antenne.

Very interesting video to look at.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

the author of SPARK gave some informations:

1. SPARK was developed by the author within his diploma at
FH-Kaiserslautern. And combined with DRM+ activities there was a
cooperation with TU-Kaiserslautern.

2. DLL f_aac.dll is the old version of faac.dll

3. DLL msvcr71.dll should be copied in the same directory as
Spark-Executable. In this case, there is no need of registration.

4. SPARK is running without problems under
Vista/XP/2000/Linux.

Thanks for Michael Feilen

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

I tested collecting all dlls and Spark.exe in a new directory.

And it works. You need not more than these parts, to get it working.

I recommend, to start SPARK with the Output-WAVe-File option.

In this - first case - You have the simpliest solution to beginn Your tests.

Then You have to read out this file with DREAM with a special parameter or with SoDiRa. This one least, is the simpliest way to hear the result.

You do not need the former type of F_ACC.dll but instead use FACC.dll.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hallo,

I wrote a text about starting with SPARK and a second file, which give some screens with comments. Michael Feilen had an eye on it.

It is written in German language.

If You send my a private Message, I will try to send You both DOCs to Your mentioned private EMail adress.

Both have a volumen of rd about 1,5 MByte.

Wolfgang Hartmann, Nürnberg

[30CB638E]

Hello!

Thank you very much for the information!!

I will use SPARK for Windows XP, so no problem.

I've downloaded the Sodira software.
I recorded the SPARK stream in a .wav . Then , I play it with the VLC player. Sodira recognise that it's a DRM stream, but it's unable to decode it, and show an error (you can see it in the Attached image).

The DRM stream that SPARK give is a sound. If you select the "line out" output instead of the ".wav file", you'll hear a sound into the speakers.
If I put this sound into the "microphone in" of a SW transmitter, I will be broadcasting DRM ? Or it's not possible to broadcast the sound that the SPARK software give ?

[dadalbinder]

Hallo,

I have seen the screen. You should fix the output frequency in SPARK to 12 kHz. In the screen, SoDiRa seems to be not able to decode because mid of signal lies at zero-point between left and right channel.

I think, You used FAAC. In this case give a little text-stream with the file, where You are able to see, wether SoDiRa sees the right WAV-File.

Modulation: I am not shure, wether it is possible to modulate the DRM signal with a just normal transceiver. The DRM-signal is very special signal. It is called DIGITAL but it is a collection of a lot of streams in AM!!!! Round about ca. 200 streams. Because of that, Your transceiver, if it is filtering the microphon signal could limit areas of the DRM-signal, which should pass without changing it.

Maybee there will be some people, they could build a little mixer capable of proper drm-signalling. I did not try till now, maybee I will try it in the next weeks.

Just for the moment, greetings

Wolfgang Hartmann, Nürnberg

[30CB638E]

I have seen the screen. You should fix the output frequency in SPARK to 12 kHz. In the screen, SoDiRa seems to be not able to decode because mid of signal lies at zero-point between left and right channel.

I think, You used FAAC. In this case give a little text-stream with the file, where You are able to see, wether SoDiRa sees the right WAV-File.

I didn't understand this very well... Could you please explain me that again??
I use the faac encoding (the faac.dll that was in the spark.zip).
Furthermore, I can't set the output frequency to 12KHz (you can see it in the attached photo). The IF frequency is already 12KHz.

Modulation: I am not shure, wether it is possible to modulate the DRM signal with a just normal transceiver. The DRM-signal is very special signal. It is called DIGITAL but it is a collection of a lot of streams in AM!!!! Round about ca. 200 streams. Because of that, Your transceiver, if it is filtering the microphon signal could limit areas of the DRM-signal, which should pass without changing it.


I've recently ordered an Himalaya DRM 2009 receiver to Thiecom. I suppose that it will arrive here in Spain in 3 weeks.
I wish tune the SPARK stream using the Himalaya, but if it's not possible... don't worry. :rolleyes:

Thanks again!

[PP5AZF-Ataliba]

Furthermore, I can't set the output frequency to 12KHz (you can see it in the attached photo). The IF frequency is already 12KHz.
Yes! It is possible. Try to change the Robustes "MODE A," OFDM bandwidth 20 kHz, ofdm IF 5,000 Hz (9,416 - 4,583 Hz). Change LPP and HPP protetion for "weak". This will be DRM 20 kHz which may reach 71.96 Kbps.
I use the DREAM for decoding between two computers (TX line out - RX line in) or a single computer (TX/RX internal) enabling "mono mix" or "stereo mix" in "recording control." Sodira not tested enough yet.


Portuguese: (translation Google)
Além disso, eu não posso definir a freqüência de saída a 12KHz (você pode vê-lo na foto anexa). O IF frequência já é 12KHz.
Sim! É possível. Experimente mudar a Robustes para "MODE A", OFDM Bandwidth 20 Khz, ofdm IF 5.000 Hz (9.416 - 4.583 Hz). Mudar LPP e HPP protetion para "weak". Isso será DRM 20 Khz que poderá chegar a 71,96 Kbps.
Eu utilizo o DREAM para decodificação entre dois computadores (line out TX - line in RX) ou um único computador (TX/RX interno) ativando "mono mix" ou "stereo mix" em "recording control". Sodira não testei o suficiente ainda.

[dadalbinder]

Hallo,

the difference could be the case of the installation of SoDiRa.

If You choose REAL COMMOn You get another screen as with COMMON IQ.

This could give an explanation.

I give You a screen of the implementation within SoDiRa.

Do You see a change by changing the receiver fixing?

Wolfgang Hartmann

[30CB638E]

Hello!!

Yes! It is possible. Try to change the Robustes "MODE A," OFDM bandwidth 20 kHz, ofdm IF 5,000 Hz (9,416 - 4,583 Hz). Change LPP and HPP protetion for "weak". This will be DRM 20 kHz which may reach 71.96 Kbps.

I've tested that you say, but I still can't set the output to 5KHz. (You can see the attached photo).


If You choose REAL COMMOn You get another screen as with COMMON IQ.

This could give an explanation.

I give You a screen of the implementation within SoDiRa.

Do You see a change by changing the receiver fixing?

Yes, Thanks!! I've changed RealCommon to CommonIQ and the program tunes my DRM stream :)
But I've a problem ; Sodira decodes the DRM audio, but it sounds accelerated. I've tried to change the DRM mode or the bitrate of the FAAC stream, but the sound is still going faster than normal...

Thanks!!

[dadalbinder]

Hello,

as far as I see, SoDiRa decodes in the middle between the I/Q channels at zero position. You should have an if, which should be chosen, to have the whole signal out of zero-position.

I had till now never a faster signal as it should be. New experience for me.

Wolfgang Hartmann

[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,

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 :cool:

[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.

[gccradioscience]

Hello, I have the free version of the software, it works good, but I am having some issues with it. When I turn the encoder on and set it to line out, the 12 kHz digital noise appears along in the headphones. How do i seperate the DRM digital signal from the monitoring analog signal? Do I need a second sound card? Is there a way to monitor the DRM transmission when it's live? I am very confused about this software. Do I need a second computer just for DRM encoding?

[dadalbinder]

Hello,

Spark does not produce an audio-signal in its output, maybee in a second soundcard, or a wave-file. It is producing a modulated signal, which You could give to some software to demodulate it. I am using SoDiRa-Software by Bernd Reiser. In this program You are able to PLAY this constructed file by SPARK and hear the result.

This way gives a first impression, what and how SPARK is working quite nice. In further special versions of SPARK there should be possibilities to "modulate" AM, SSB, FM and DRM A, B, C, D and even E. As far as I see, there is no possibility to generate a DRM E or + signal at the moment.

You could use a generated wav-file (modulated as I mentioned it) to give this signal to a mixer and transmit it. One could select a wide range of frequencies to do so.

Second soundcard: I personally use two soundcards and it is easy to switch to the output "soundcard". Within Spark, You have one soundcard, from which one takes the input signal for Spark and the second soundcard, to give this signal to a mixer or SoDiRa or other software. .. and transmit it.

You are able to construct a second audio-chanel even more by using the software VAC, virtual audio cable, and integrate it in Your computer. (But an audio-channel is not necessarily an audible audio-signal!!)

But: For first experiments, one could SPARK in another way: Take an input by a wav-file for the program and give it into the output of Your soundcard for mixing. In this possible solution, You are not able to decode the result in Your computer but at a nearby receiver, which is able to receive the mixed signal. You find a circuit on the page: www.sat-schneider.de even in english language. Such mixers are very practical.

A second soundcard could be usefull for specialized decoding programms as cw-decoders or for more specialised modulations. Take the output of the first card for audio-purpose, the next, You could give to a spezialised decoding programm. It es even possible with VAC.

A big bunch of possibilities but one has to try and manage all these possiblities. If You are able to manage all these procedures, You will be grown as a deep specialist in SDR, software defined radios. It is a nice experience.

You could try to take a 455 kHz IF from a receiver, give it to a mixer-circuit and produce a transmitted signal, You are able to receive by a stand-by receiver.


Wolfgang Hartmann, Nürnberg

[gccradioscience]

Hello,

Spark does not produce an audio-signal in its output, maybee in a second soundcard, or a wave-file. It is producing a modulated signal, which You could give to some software to demodulate it. I am using SoDiRa-Software by Bernd Reiser. In this program You are able to PLAY this constructed file by SPARK and hear the result.

This way gives a first impression, what and how SPARK is working quite nice. In further special versions of SPARK there should be possibilities to "modulate" AM, SSB, FM and DRM A, B, C, D and even E. As far as I see, there is no possibility to generate a DRM E or + signal at the moment.

You could use a generated wav-file (modulated as I mentioned it) to give this signal to a mixer and transmit it. One could select a wide range of frequencies to do so.

Second soundcard: I personally use two soundcards and it is easy to switch to the output "soundcard". Within Spark, You have one soundcard, from which one takes the input signal for Spark and the second soundcard, to give this signal to a mixer or SoDiRa or other software. .. and transmit it.

You are able to construct a second audio-chanel even more by using the software VAC, virtual audio cable, and integrate it in Your computer. (But an audio-channel is not necessarily an audible audio-signal!!)

But: For first experiments, one could SPARK in another way: Take an input by a wav-file for the program and give it into the output of Your soundcard for mixing. In this possible solution, You are not able to decode the result in Your computer but at a nearby receiver, which is able to receive the mixed signal. You find a circuit on the page: www.sat-schneider.de even in english language. Such mixers are very practical.

A second soundcard could be usefull for specialized decoding programms as cw-decoders or for more specialised modulations. Take the output of the first card for audio-purpose, the next, You could give to a spezialised decoding programm. It es even possible with VAC.

A big bunch of possibilities but one has to try and manage all these possiblities. If You are able to manage all these procedures, You will be grown as a deep specialist in SDR, software defined radios. It is a nice experience.

You could try to take a 455 kHz IF from a receiver, give it to a mixer-circuit and produce a transmitted signal, You are able to receive by a stand-by receiver.


Wolfgang Hartmann, Nürnberg


I will try to study this, and look into the virtual audio cable software. I see why the free version is in mono, makes since, cause it would be far complicated to do a 2 channel stereo signal along with the noise. I will just study it more after I get a receiver.

Honestly, I have not got a receiver, yet, but I will let everyone know when I will get the receiver with the IF output. I am going to try to get the second receiver that already has a IF output jack for FM modifed and get the other side called AM modifed for DRM reception. I have to poke around the receiver for a good clear signal. Like I said I need a receiver to hear the other side of things cause my setup if deaf right now and I only have a Dream receiver not the actually AM receiver with DRM demodulation.

[dadalbinder]

Hello,

this version of SPARK is the published version for general use.

It is able to modulate DRM modi A, B, C, D.

Have a look into the appendix to see a screen of the program with remarks from the author, Michael Feilen.

There is the opportunity to go to mode E or DRM+. On my machine it does not work because of the restricted multiplex channel.

There are further versions of the program, which are not broadly published. They are able to modulate AM, SSB=LSB, USB, FMbroad with RDS, DRM A, B, C, D, E and in DRM-mode to generate some text, pictures as in a normal DRM-transmission. In the mode AM one is able to set AMSS-mode with text messages.

In all these cases You get a modulated wav-file or soundcard-output.

To decode, You need DREAM or SODIRA. FM-broad with RDS (radio data system) its only decoded by SoDiRa.

I will try to give some more informations later.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hello,

two screens while modulating.

You find one screen for DRM B and one for DRM E

Both with adapted values and parameters.

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hello,

two additional screens of the mentioned modes.

You are able to see fixed paramters in the screens

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hello,

2 screens schowing SoDiRa demodulating wav-file (AM).

Wolfgang Hartmann, Nürnberg

[dadalbinder]

Hello,

in some versions of SPARK one is able to choose the output format.

- Complex I/Q
- REAL (i-only)
- Envelope & Phase (E & P)

Have a look in the Appendix




Wolfgang Hartmann, Nürnberg