Re: HF DF Receiver

Adam Rong
 

Melvyn,

If you download the manual, you will see the modification to 40m. Following the same rule, you will need to modify the magnetic rod coil tank, the preselector, but you don't have to modify the oscillator as the default frequency is 1/2 of the working frequency.

R3500D English manual including part list, modification instruction to 40-meter band and photo of the PCB assembly

Thanks,
Adam

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