Originally posted by frankz1
My splitters say right on them that they attenuate the signal by 3dB, so the fact that removing a splitter would amp your signal by 3dB is hardly an experimental breakthrough.[/QUOTE}
If you have noise on the line it will also be increased 3dB when you remove the splitter. Hence, if the noise level on the line is significant with respect to the noise introduced by the box, you simply won't see the 3dB increase in SNR. If you do see the 3dB increase, it means almost all the noise is introduced by the box. Get it now ?
What would be fairly scientific would be if - say - Comcast came out when you were having problems and hooked up a signal meter to measure your SNR at the line and then comparing that to what the box was reporting. Hmmm...let me see...oh, yes. That's exactly what happened here! And the fact, your unscientific and wholly pointless experiment "not withstanding," is that they both showed the same reading when connected to the same feeder line, nephew.
This is exactly the outcome you would expect if the noise on the line is greater than the noise introduced by the box. Then the line SNR will equal the box SNR ( the noise introduced in the box is negligible compared to line noise. No wonder you were having problems). But, if the noise on the line is the negligible noise, the SNR will increase when you remove the splitter, and you will discover (perhaps to your horror) that it is the box introducing all the noise.