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Old 20th December 2006, 06:44 PM   #1011
oettle is offline oettle  Germany
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Hi Andrew,

I would say the output impedance of the M1000 isn't 75 but about 100 + 75 ohms. With a 30 cm cable reflections aren't the big problem, but level. I had already dropouts with a 2V S/PDIF source, Jan too. Based on this experience this 300 mV value from Behringer seems to be very unrealistic.

Frank
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Old 20th December 2006, 07:39 PM   #1012
Ryssen is offline Ryssen  Sweden
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Quote:
Between DEQ and DCX is a 30cm cable with XLR in the ends,one wire to each of the 3 pins.I´ve tried to ground 1 pin inthe cable between DEQ and DCX,no DIFFERENCE..
Thanks for the aswers,but I think you guys are forgetting that I have a DEQ after the M-1000..the DCX is after the DEQ.
Quote:
1. DCX XLR 1 with M1000 GND (D)
Quote:
2. DCX XLR 2 with M1000 pin 2 (hot)
Quote:
3. DCX XLR 3 with M1000 pin 1 (cold)
If I make this:
1. DEQ XLR 1 with M1000 GND (D)
2. DEQ XLR 2 with M1000 pin 2 (hot)
3. DEQ XLR 3 with M1000 pin 1 (cold)
instead,without a resistor?
And I don´t have a schema of DEQ digital out,but if not wrong,it should output AES/EBU,110r, and that´s what the DCX will recive?
Quote:
The DCX2496 is set for an AES signal which is expecting 110r loading.
So I should be fine with:
XLR 1 to XLR 1
XLR 2 to XLR 2
XLR 3 to XLR 3

Right?
The DEQ works absolutely fine with M-1000...
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Old 21st December 2006, 07:42 PM   #1013
Ryssen is offline Ryssen  Sweden
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Sorry,tried every one off the tricks again!It must have sommething to do with the input/SRC in DCX to do.
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Old 23rd December 2006, 12:02 AM   #1014
mige0 is offline mige0  Austria
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Default OFF topic

hi

for those who are interestet in the jitter ropic, I updated my page withsome nice measuremants.

"http://www.kinotechnik.edis.at/pages/dcx2496/DCX2496/DCX2496_analog_digital_input.htmll"
http://www.kinotechnik.edis.at/pages...tal_input.html


Ryssen
did you ever measure voltage and current flow (over a resistor) from ground (DEQ) to ground (DCX)?

I connected XLR-PIN1 (DCX) only to the shield and didn't connect the shield on the other end but I think that is what you already tried.

greetings
Michael
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Old 23rd December 2006, 09:59 AM   #1015
mige0 is offline mige0  Austria
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Ryssen,

did you try to avoid DC current flow by soldering around 10n-100nF to XLR-PIN1 and XLR-PIN3 at the DCX.
The DCX has an tiny and much less then ideal input transformer that easily can be satturated even by very little DC currents flowing from some minor offset voltages of the output stage of the source device.

Greetings
Michael
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Old 23rd December 2006, 01:46 PM   #1016
Ryssen is offline Ryssen  Sweden
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Quote:
I connected XLR-PIN1 (DCX) only to the shield and didn't connect the shield on the other end but I think that is what you already tried.
Tried it now,no difference..
Quote:
did you try to avoid DC current flow by soldering around 10n-100nF to XLR-PIN1 and XLR-PIN3 at the DCX.
Tried it now,no difference..
Quote:
The DCX has an tiny and much less then ideal input transformer
Could it be the transformer that´s the bottleneck?Att 48khz I can crank up the input signal so that ALL leds light up like a christmastree and my ears start to bleed,and NO distortion,can the transformer handle 96Khz in?
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Old 23rd December 2006, 01:52 PM   #1017
AndrewT is offline AndrewT  Scotland
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Hi,
the input led monitors work differently when using a digital input.

It is common/normal for the "reds" to be "on" and for the digital signal to be undistorted.

The trick would be to listen for drop outs as the digital signal is lowered and then read off the LED indicators for your low voltage input that causes drop out of the digits.
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Old 23rd December 2006, 02:09 PM   #1018
Ryssen is offline Ryssen  Sweden
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Well,there is NO LOW voltage dropouts.I can can go all the way down to ZERO digital input,it is when,at 96khz,I start to raise the the digital signal,at -10 it starts to sparkle like newyears firworks.Switch SRC to 48khz and ,I can raise how much you want.
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Old 24th December 2006, 06:36 PM   #1019
Ryssen is offline Ryssen  Sweden
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Those of you who have modded the DCX digital input,are you using the input transformer or have you removed it?Can I messaure the signal before and after the transformer with a scope?After all there is one transformer in DEQ and one in DCX,that makes 2 in series...

Merry X mas.
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Old 24th December 2006, 10:11 PM   #1020
mige0 is offline mige0  Austria
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ryssen,

you may download the CS8416 datasheet from

http://www.cirrus.com/en/pubs/proDat.../CS8416_F2.pdf

there you also find transformerless interfacing wich you can try.
I don't think you have an interface problem either due to the fact that that it comes and goes with volume.

Yes, you can measure the digital sgnal with your scope - at least the peak to peak value gives you some basic information.

Did you check for DC and AC ground currents and voltages between your devices?

greetings
michael

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"About the JITTER issue with the Behringer DCX2496 Ultra-Drive PRO"
http://www.kinotechnik.edis.at/pages...tal_input.html
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