Kenwood TS-590S - Manual (Page 21)

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5.3. Program Limitations
CW operations are possible, but keying using normal e-keys is not possible. Strings
entered using the keyboard are collated for transmit operations.
5.4. Limitations if Using USB Audio Functions
If the PC and TS-590S are connected via a USB cable, audio transmissions can be
transmitted using the USB audio function. In principle, however, there is a delay with USB
audio, so sound may be lost depending on the PC performance and load status. If using a
USB connection for transmitting audio on the host station, the delay due to network traffic
to the remote station is also added, so the delay is further increased.
If audio transmissions are connected via USB terminals, and if playing warning sounds
from the OS or music and video on the PC, the sounds may not emit from the speakers.
Furthermore, depending on the OS sound and properties, the transceiver DATA VOX
function settings, and the modulation path, the audio may be modulated from the
transceiver, so be careful during PC operations and when playing these files.
Depending on the combination of PC and sound functions, normal operations may be
disabled.
Kenwood does not offer support for customer computers.
We recommend using audio cables without using USB audio functions for KNS operations.
(See "4.2. Connecting Audio Cables".)