Not having any issues.....but after looking this morning to see if my Tivo rebooted last night (separate issue) from the DVR Diagnostics screen....I noticed all my my tuners had 100 signal level and generally a high 41-43 SNR.
Now after doing a bunch of reading online....seems Tivo recommends the following ranges:
Minimum SNR
QAM 64 - 23 dB
QAM 256 - 29 dB
Maximum SNR
QAM 64 - 30 dB
QAM 256 - 35 dB
Now, the only real reason I care is some people say those high levels of mine, not so much the SNR but the signal, can cause the Tivo problems over the long run. I've read somewhere that Tivo has protection built in that in extreme cases will cut the signal if it's too hot?
Most people I read say that Tivo is a little picky with the SNR numbers. Some say why would a high SNR be bad......only thing is that a high SNR could mean a high signal level (which I think is what I had).
My setup
For my house I have the cable that enters the house split once (-3.5dB each) to feed the cable modem on a clean run and the other to feed a 4 port amp that boosts (7dB) for each port. One of those ports feeds the Tivo (about a 26 foot run).
So first thing I did was take the split before the amp and split it again with a -3.5dB splitter. I fed the Tivo directly from this, and the amp with the other side. That was line into house -3.5dB, -3.5dB and then a run to the Tivo. This was OK....but overall I saw some issues with some channels having a real low SNR level of 26 and a low signal level. This caused severe pixelation and tons of errors.
So next I reverted everything back to the amp. From the amp port that feeds the Tivo....I ran a cable into a 3-way splitter and used one of the -7dB ports. This to me is basically using the amp to go +7dB and the splitter to go -7dB. This really didn't make much difference. All my signal levels stayed at 100 and the SNR levels stayed basically around 41-43dB. I read this as the signal was still to hot.
So I took that -7dB run and split it again with a -3.5dB splitter. Now, SNR levels down into the upper 30's (36-39dB)....but what I think is more important are the signal levels are now all under 100....most in the 96-99 range.
What's weird is by splitting this after the amp....I'm taking -10.5dB off the signal (while adding 7dB)....that technically is about the same as splitting the line before the amp....but for some reason splitting before the amp dropped the signals too much? No idea why.
Anyway.....I think I'll order some attenuators and replace my franken-splitter setup.
I'm assuming splitters do the same thing as an attenuator would correct? Just that the attenuator is a cleaner install?
Anyone know why the pre-amp split would cause the bad signal levels?
-Kevin
Now after doing a bunch of reading online....seems Tivo recommends the following ranges:
Minimum SNR
QAM 64 - 23 dB
QAM 256 - 29 dB
Maximum SNR
QAM 64 - 30 dB
QAM 256 - 35 dB
Now, the only real reason I care is some people say those high levels of mine, not so much the SNR but the signal, can cause the Tivo problems over the long run. I've read somewhere that Tivo has protection built in that in extreme cases will cut the signal if it's too hot?
Most people I read say that Tivo is a little picky with the SNR numbers. Some say why would a high SNR be bad......only thing is that a high SNR could mean a high signal level (which I think is what I had).
My setup
For my house I have the cable that enters the house split once (-3.5dB each) to feed the cable modem on a clean run and the other to feed a 4 port amp that boosts (7dB) for each port. One of those ports feeds the Tivo (about a 26 foot run).
So first thing I did was take the split before the amp and split it again with a -3.5dB splitter. I fed the Tivo directly from this, and the amp with the other side. That was line into house -3.5dB, -3.5dB and then a run to the Tivo. This was OK....but overall I saw some issues with some channels having a real low SNR level of 26 and a low signal level. This caused severe pixelation and tons of errors.
So next I reverted everything back to the amp. From the amp port that feeds the Tivo....I ran a cable into a 3-way splitter and used one of the -7dB ports. This to me is basically using the amp to go +7dB and the splitter to go -7dB. This really didn't make much difference. All my signal levels stayed at 100 and the SNR levels stayed basically around 41-43dB. I read this as the signal was still to hot.
So I took that -7dB run and split it again with a -3.5dB splitter. Now, SNR levels down into the upper 30's (36-39dB)....but what I think is more important are the signal levels are now all under 100....most in the 96-99 range.
What's weird is by splitting this after the amp....I'm taking -10.5dB off the signal (while adding 7dB)....that technically is about the same as splitting the line before the amp....but for some reason splitting before the amp dropped the signals too much? No idea why.
Anyway.....I think I'll order some attenuators and replace my franken-splitter setup.
I'm assuming splitters do the same thing as an attenuator would correct? Just that the attenuator is a cleaner install?
Anyone know why the pre-amp split would cause the bad signal levels?
-Kevin