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Not familiar with your xmtr,does it have a jumper in it where you can choose high or low impedence? 10k into a 50 ohm mpx input is an obvious problem.You might contact your xmtr manufacturer…50 ohm mpx out into 50 ohm mpx in is perfect.Also most exciters with 10k input require 3.5 ppv for 100 per cent modulation.
[quote author=”iguman”]but with this resistans i use volume in my card is on maximum[/quote]
Then the exciter’s input is NOT a 50 ohm load. It’s probably more like 10,000 ohms… but this is something you still haven’t answered yet.Again, the outputs are designed to work with certain loads, but ARE NOT rated in resistance because they are not supposed to be loads. So please refer to them as "designed for a N ohm load" or something like that, where N = the load in ohms.
It’s not as annoying or stupid as people thinking that a polarity switch somehow "reverses" phase. I’ll give it that. 😉
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So, iguman, what adjustments do you have on your exciter, for audio gain? Try no additional load on the soundcard, soundcard cranked, and then adjust the exciter’s controls so it’s the modulation is correct?
iguman, state your transmitter / exciter make and model…
Also, does igu stand for Iguacu ?
The shorter the cable is, the less impedance mismatches will impact the frequency response. Thus, to keep it simple, all you really have to do is to go straight from 192k sound card to the transmitter (skip the external stereo coder, there is nothing to gain from using it), and adjust the input gain of the transmitter until you see enough modulation from what the sound card can output. Pro sound cards (such as ESI Juli@) have pretty stiff output sections and should be able to drive a 50 ohm load no problem.
///Leif
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