Limesdr USB How to output hf 1~35MHz

I am debugging with GnuRadio,
When setting the RF frequency to 35MHz,
The frequency meter shows a frequency of 40.23245MHz.
The same is true for the 20MHz frequency.
How to use limesdr usb to output HF?
Such as: TX1 1MHz ~ 35MHz

I have the same question, I am unable to generate frequencies below 30 MHz. Dont know what to do.

For HF below 30MHz use NCO, downconverter for transmit and upconverter for receive. Also, dont forget to set LPF high enough.

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