@Martin_T - Martin,
I see some inconsistencies in how you’d use SDRAngel with the setup you have for HF. Here’s what I’m seeing wrong in the picture:
1.) You have NCO turned on, but you need to put the NCO frequency at 30 MHz, not 16.6 MHz as shown.
2.) The Lowpass Filter (LP) is tuned to something in the order of kHz. You really need to open it up to 130 MHz (wide open for HF) to get the gain of your receive up.
3.) Your sample rate is set WAY too high - it’s needs to be around 7,000,000 and not 35,000,000.
4.) Your H is set to ‘1’ and your S is set to ‘1’…they really should be set for 32 and 16 respectively.
Try those adjustments first and and then see how it plays. Please let me know your progress toward that, too.
73 de Marty, KN0CK