Digital MPX Forum

[yorkie98]

Stelios, A Juli@ gives 192Khz out on the electrical output, did you test this?
Which card do you intend to use for the optical DMPX test?

Yorkie.

[djscooby]

Hello i have a simple question for you..

Lets suppose that we buy the exciter you build..
How are we going to broadcast the signal from the studio to the mountain digitaly with no loss cause the links currently having are analog only and need mpx signal to work?

Greetings from greece

Sakis d.

[sigmacom]

@djscooby:
If you have analog MPX signal from your radio link receiver, you can send it to Port C of the Exciter, and enable the External BB mode.
This exciter is capable to accept any source (see here), but of course you will have lower audio quality comparing to a digital source.
To have perfect results, you need to send digital audio (or D-MPX) signal. You can find some cheap solutions for this, like Barix with a 5.8GHz WiFi link (like Ubiquiti Bullet5).
In the future there will be a digital radio STL (ricardogerassi I didn’t forgot you). Also, I think Leif has plans for an IP STL.

@yorkie98:
Xonar D2/PM will be tested for optical D-MPX, I will have one soon.
Later I will edit this post to upload some pics of coaxial D-MPX test.
Until then guys, I can offer you the following video by George:

http://www.youtube.com/watch?v=jynddnxgbi0

[Boki]

Really nice Video !
I must agree with Leif about modulation/deviation setting.

[quote author=”Leif”]How about letting the user choose what dB input level will equal 75 kHz deviation, and leave it at that?[/quote]

[George]

To:yorkie98:

To be honest, Xonar was the only card at my hands (Emu0404pci,Esi-Julia,Esi-Maya44,XonarD2) that
gave 192Khz at optical out from the first audio test of DDS-Exciter.
Also, for another one time I have to remind you and agree with Leif that this card (Xonar) works very bad at ASIO mode with BBP (didn’t trye’d anothing else at ASIO).

To:Stelios

I hope soon to have again this amazing box at my hands,at my place, to create a new
video with the results and the audio from my Technics ST-G90 tuner with the
well known applications as RTA,Audition,maybe MPXtool etc..

Regards,
George

[Boki]

Hi George,

Why only Optical?
What about Digital coaxial output with Juli@? Can you try that?

[George]

Hi Boki,

as "Tech-Freaks" 😯 optical audio connection was a nice plan for me.
As I know Stelios has to do some test at the lab next days regarding analog & digital MPX
input at DDS-exciter that include coaxial connection also.

Next video from me will cover all type of connections with Emu0404/Esi Juli@/Xonar audio cards.

In case that you need something special to try please let me know.

Regards,
George

[JesseG]

[quote author=”George”]In case that you need something special to try please let me know.[/quote]
Dancing girls in the background.

[George]

Easy!!!
I’ll create a "special edition" video for you….

I hope all of us to agree with you Jesse and nobody ask me
to replace girls with something….else 😆

[Joop Krauthausen]

HEY !!

The girls holding a can of beer would me nice… 🙂

or Ouzo.. ehm. or Metaxa… damn..just let ‘m dance..

Joop 🙂

[camclone]

( about digital 5 GHz STL using IP… : )

5 GHz STL over IP ? ,,,Wifi.,,, ? no no no no no…. at my RF mountain…we have one MILITARY RADAR… and everytime i open a wi-fi 5 GHz link …Boooooooooooooom 🙂

any 200 KHz deviation digital STL availabe ( 1,7 GHz radiolink band ) ?

..Radar compatible ? ( Dancing girls will be at the top of the radar.. 😳 😳 😳

[yorkie98]

George, I totally concur with JesseG, Dancing girls would be great, if they could also be holding drinking beer as per Joop’s idea or Jagermeister also, this would truly be a visual treat.

For the technical test, I think it’s just really a case of testing all of the input modes, if remember correctly these are:

1. Analog L/R input using built in DSP coder.
2. Digital optical L/R input using build in DSP coder.
3. Digital electrical L/R input using built in DSP coder.
4. Analog MPX input.
5. Digital optical MPX input.
6. Digital electrical MPX input.

Most of our interest lies primarily with 5 and 6 as these are where the quantum leap in quality can be gained with a fully digital airchain and BBP providing a digital MPX straight to the DDS carrier.

Yorkie.

[Boki]

[quote author=”camclone”]5 GHz STL over IP ? ,,,Wifi.,,, ? no no no no no…. at my RF mountain…we have one MILITARY RADAR… and everytime i open a wi-fi 5 GHz link …Boooooooooooooom 🙂[/quote]

What "booooooom:" mean ?
What if there is radar (any radar) ? 5GHz iz non-licensed band, afaik in every part od world.

My link works great almost 3 years with in first time RB133c, and now NS5 with external dish antennas. with audio latency under 100ms. 6.5km.

[camclone]

Boooom : means …a small dot on the millitary radar screens up to the mountain!!

Some 5 GHz wifi access points have a radar protection but not all of them.

Don’t try this at home 🙂

[Boki]

Camclone,
Do you think this ?

MikroTik (dfs)

NS5 (dfs)

😀 This has nothing to do with "radars"

Set Two NS5s (if you wish with external antennas) and all will be good 😉

[Author]

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