Hi everyone,

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A quick little question: After receiving my fully assembled QDX, I noticed that it is not working correctly in the 20m band. As soon as it goes to TX in the 20m band, the LED flashes twice in quick succession. The QDX is then blocked and I cannot access it with wsjt-x (reports CAT error) or via a terminal program. Only after disconnecting the power supply and plugging it back in again is access possible.

The error does not occur on 40m. Everything works fine there.

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I have tried the following:

1. Laptop with Windows 10
2. Laptop with Windows 11
3. Various USB cables

4. Older Firmware Versions

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Unfortunately, everything was unsuccessful.

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I hope someone in this group has an idea of what I can do and look forward to your feedback.

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vy 73 de Andree, DG7DK

On Mon, May 5, 2025 at 06:59 PM, <dg7dk@...> wrote:

the LED flashes twice

From the manual (RTFM)

"2 flashes:
QDX is receiving audio from your PC. But the volume is insufficient to trigger the key-down
(transmit) action."

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73 Ludwig