Re: QCX and peaking BPF
You need to do the start-up mod if your board rev is 1 or 2 (number on lower right of board). http://qrp-labs.com/qcx/qcxmods.html#pwrup
BTW, there are a number (4 at least that I recall) recommended mods for any PCB prior to rev 3.
Hope this helps (think it will).