Re: LPF frequency curves #lpf
Daniel Ekman SA2KNG
On Wed, Dec 27, 2017 at 10:19 PM, Bob Sutton via Groups.Io <zl1rs@...> wrote:
The output from the synth is squarewave-ish, driving different PA designs in the qrp-labs product line, so not looking the same after amplification. on top of that we have coupling in the pcb, grounding and cables that leaks a bit more of the higher order harmonics past the filters.
That said, who knows what questions/problems may have arised if this optimized filter was the design in the qcx (:
If/when I rebuild my U3S to include the 5W PA, I may try these designs in the LPF modules as they're a lot easier and cheaper to mess with rather than on the qcx. Also ordering the latest design on the relay-switched board.