NRF-PA-LNA is such a popular module, and I'm now using it in my project. I bought a pair of small modules (with printed antenna) and a pair of modules with PA & LNA. However, while the small modules work perfectly with my program, the ones w/ PA LNA don't.
I've tried every possible solution I found on this forum, which includes
power the NRF-PA-LNA with 2 AA batteries;
connect a 10-uF capacitor between VCC and GND;
set power level to MAX or MIN; set the two modules far apart with no obstacle between;
demount the SMA antenna...
But none of them works out the problem.
I wonder if I've tried everything I could do. If so, I wonder if it's just becuase the modules were broken since the very beginning.
I also reviewed the user feedback for the Ebay seller, "nc-maker-shop", whom I bought the modules from. Buyer satisfaction was found to be 100%, which seems quite wierd. I wonder whether this seller offers reliable products, and if not, I'll be grateful if anyone could recommend a reliable seller.
Stay safe and healthy!