Recently, I measured and compared the spectrum of the output signal of LNB using different REF modes.
First measure the TCXO installed inside the LNB.The signal looks clean.Low base noise, good signal-to-noise ratio
The measurement then provides a REF signal to the LNB through a diplexer.
The output signal becomes very noisy.The signal-to-noise ratio is significantly lower.Has anyone done the same measurement?
I hope everyone can see what I post with translation software 73 DE BG0AUB