3 flashes
If the status LEDis flashing three times, this means that QDX is being correctly commanded to go
to transmit mode (the host application activates the PTT CAT command), QDX is detecting and
measuring the audio from the PC, and furthermore, the audio is of sufficient level to activate the
QDX transmit.
If you are STILL not getting power output then this indicates a hardware problem, either with QDX,
or with the connections to your power meter.
QDX transmitter hardware problems are often the result of failure to properly remove the enamel
from the enameled copper wire on the toroids and/or binocular core, resulting in no electrical
connection.
6. Resources
For updates and tips relating to this kit please visit the QRP Labs QDX kit page
For any questions regarding the assembly and operation of this kit please join the QRP
Labs group, see
7. Document Revision History
1_03 23-Dec-2021
First version, for firmware 1_03
1_04 20-Jul-2022
Firmware 1_04 changes
QDX operating manual; firmware 1_04
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