Jim,

Are you using PTT and VOX both?  If so, try only one.
With HRD, you can set PTT via command (no physical connection to the hardware PTT line). That has always worked well for me, but I have not tried it with the KX2.

73,
Don W3FPR

On 5/2/2017 2:26 PM, Jim Sr Sturges wrote:
First post. Connecting KX2 to HRD on Surface Pro 3 using provided ACC-USB
cable, and audio via cables to a USB sound dongle.

PSK-31 using USB mode on 20M: Receive works great. When I transmit, TX
light comes on, data is sent, but TX light stays on even though transmit
power drops to zero.

Would like to have transmitter stop!

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