Most digital packages, such as MixW, Digipan etc produce TX audio tones
on both the Left and Right audio channel, but fldigi has the option of
producing the TX audio on only one channel. This can cause some head
scratching when the package appears to be set up correctly, yet the
TS-590S does not transmit a digital signal.
The updated version of my digital HOWTO explains how the Left/Right
audio channels are handled by the TS-590S, and how to set up fldigi
correctly for operation with the TS-590S.
For the HOWTO, go to the TS-590S Resources Page:
Scroll down to the "HOWTOs" section, then click on the link:
"HOWTO set up the Kenwood TS-590S for Digital Data and Digital Voice
Pages 4 and 5 explain in detail how the Left/Right audio channels are
The TS-590S Resources Page: