This is a WSJT-X feature called "Flatten", which is intended to compensate for the imperfect passband of some crystal filters etc (with suitable calibration). On QMX the passband is already flat, it's a DSP filter and very flat. You need to switch off "Flatten". It's a checkbox at the bottom of the waterfall display screen of WSJT-X.
On Sun, Feb 25, 2024, 9:14?AM Quentin VA4HSW/F4HSW via <qrp.le8b2=[email protected]> wrote:
Hi,
I build my QMX 1 week ago. The process run well and I'm able to use it.
However, I got some weird noise around 150Hz on WSJTX, as you can see in my screenshot. I trying both magnetic loop antenna and dummy load. It don't know were to search to find the reason on the noise. I tried a 9V battery and a USB-C PD set on 9V as power source but I still have the noise. I try with both ACG/VOX enabled/disabled.
I ran the sweep hardware test using the terminal access and all curve sounds good, according to the operator manual. I also verify my band settings on the menu and all correctly setup too.
Do you have any clue what can be the cause of that RX noise?
