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Line Level from SD 302 to Lectro UM400a problems?


Eric Toline

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With a properly wired cable for line input into the Lectro TX the TX cannot be attenuated enough to make it useable. The 302was set to factory default line output and the cable was wired as per Lectro with the line source feeding pin 5 on the TA5.

A call to Lectro tech support came up with a solution of adding a 10k ohm resistor in series with the positive feed which dropped the "0" level of .775vac to .395vac from the 302which should be fine.

Lectro tech thinks it's an impedence mismatch between the 302 & the 400a causing the problem. Anyone ever had the same type of issue with a 302 & a UM400a?

Thanks, Eric

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Thanks for the confirmation of the problem. Still not sure if it's caused by the 302 output circuit or the 400a input. In any event I added a 10k resistor in series with the positive feed and sent the cables off to the customer. I'll get his feedback later this week as to wether it solved his problem.

Eric

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