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Re: QDX: Anyone else having a problem with image rejection? #qdx


 

Hi Evan-

Thanks for the reply.... right after building it, my scan looked great. Today, not so.

I also noticed that the image rejection looked like it went to more normal after I unplugged the USB and re-connected it.... but no power cycle.

No explanation?for that (yet).

73
Andy
WM8Q


On Sun, Dec 19, 2021 at 2:12 PM Evan Hand <elhandjr@...> wrote:
Hello Andy,

I am not aware of an adjustment for image rejection, as that is in the software unlike in the QCX line of transceivers where it is analog.??

What is the Audio Sweep showing as far as image rejection?? When I do my scans with a dummy load connected I am seeing better than 60db rejection.

I would also make sure you are on the latest version of firmware 1_02.

One last point, I remember one of the changes of version 1 to version 2 of the hardware was adding bias resistors to the BPF switch to help with strong signal rejection.? Here is the message link:
/g/QRPLabs/message/74675

73
Evan
AC9TU

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