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| Mpx cable maximum length https://forums.stereotool.com/viewtopic.php?t=5691 |
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| Author: | bumm [ Fri Oct 17, 2014 4:25 am ] |
| Post subject: | Mpx cable maximum length |
hello, I have a distance of 50 meters from the pc to the transmitter. have unbalanced input and output mpx. I have to use a special cable or it will not work? Thanks!! |
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| Author: | Clipper [ Fri Oct 17, 2014 4:42 am ] |
| Post subject: | Re: Mpx cable maximum length |
That is a long cable run to be running a low level baseband signal through. I would think you need to find another solution to get your PC closer to the exciter. RG-62 is about 30 pF/m so after 5 metres you're in trouble and forget RG58 after about 2 metres. You could try RG-114 but I think the real solution is move the exciter closer to the PC or PC closer to the exciter. C. |
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| Author: | bumm [ Fri Oct 17, 2014 4:55 am ] |
| Post subject: | Re: Mpx cable maximum length |
I can make it closer to 30 meters. And I can not bring more because I think using the same pc studio I have no other. it can work? |
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| Author: | weskeene [ Fri Oct 17, 2014 6:06 am ] |
| Post subject: | Re: Mpx cable maximum length |
Work? Yes. Be flat? Unlikely. That's the problem with baseband, it's extremely delicate. Any small amount of nonlinearity (phase or amplitude) you introduce will result in overshoots. Be warned that you may need to undermodulate a few percent so that your peaks don't put you over the line. But yes, you'll get audio, and even stereo. |
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| Author: | bumm [ Fri Oct 17, 2014 6:20 am ] |
| Post subject: | Re: Mpx cable maximum length |
I found that my transmitter has balanced mpx input , so could do with a balanced cable 30 meters of mpx signal without problem? |
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| Author: | Bojcha [ Fri Oct 17, 2014 11:54 am ] |
| Post subject: | Re: Mpx cable maximum length |
Quote: I found that my transmitter has balanced mpx input , so could do with a balanced cable 30 meters of mpx signal without problem?
First make sure that inside transmitter all 3 wires are used. Sometimes they put balanced and it's just not.
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| Author: | nunoserra [ Fri Oct 17, 2014 12:34 pm ] |
| Post subject: | Re: Mpx cable maximum length |
Shortest possible |
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| Author: | bumm [ Sat Oct 18, 2014 5:40 am ] |
| Post subject: | Re: Mpx cable maximum length |
yes i have 10kw elenos whit mpx+ and mpx- input for balanced mpx...i try this and i tell you. |
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| Author: | hvz [ Sat Oct 18, 2014 6:08 am ] |
| Post subject: | Re: Mpx cable maximum length |
You might be able to correct a lot of issues with the calibration settings. But it's always better to not need those (although, if you have enough headroom on your sound card, there will be no difference to your listeners). Without calibration I have noticed a clear difference in stereo separation (this was years ago, before I had measurement equipment, but it must also have caused overshoots and tilt) when I added just 5 meters of cable. |
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| Author: | Clipper [ Sat Oct 18, 2014 6:20 am ] |
| Post subject: | Re: Mpx cable maximum length |
Another alternative could be to move your exciter close to your PC and use a run of heliax from the exciter to the power amplifier. |
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