hi, i have an unclear problem to me. I have sdr console running with RTL stick and receive eshail great. But to stabilize the lnb i made 25 MHz input. IT works fine with gpsdo from a local ham.
But when connecting dds or si5351 running 25mhz i get sideband spikes every 800hz. Check pict.. https://photos.app.goo.gl/84bAhVNahP8uwSdc7
Note the left waterfall is the NB cw beacon .
With xtal driven lnb its normal 1 spike and with dds or si5351 8 Spikes..
I tried raising and lowering 25mhz Signal strength and tried low and high Pass Filtering..
But the 8 spikes Stay..
Beacon signal is between 30 and 35 dB.. Noise floor is ok..
Any Idea beside buying other stuff is Welcome .