The line-level radio "DATA" (really audio) output is almost certainly overdriving the default mic-level input of the DigiRig. The solution is to enable the Digirig's built-in 20db attenuator.
Here's a good video that show's how:
I've done it to 2 Digirigs for Winlink on an FT-817nd, an FT-897d, and an Icom IC-208h. Really brings the transmit audio into reasonable levels. I consider it essential for my puposes.
Here's a good link that explains line vs mic levels:
Hope this helps,
73 Jeff kn8a
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Jeff, KN8A
