I'm no RF guru, but had thought?a diode ring mixer would be fine with a square wave LO.
Would be interesting to hack the analog VFO to give a square wave at the same amplitude as the Si5351, see if that has similar rx noise. ?Might be other things going on here, like uC hash or a poor board layout.
Curious how the softrock guys found it necessary to have galvanic isolation for their Si570.
I assume nobody in the field yet has a Raduino equipped Bitx40 to experiment with.
What Si5351 board are you using?
Jerry, KE7ER
On Wed, Jan 4, 2017 at 8:26 PM, Joel Caulkins caulktel@...? wrote:? ?Mine was noisier too until I put a LPF inline with the Si5351.?
