mardi 30 août 2016

Roamio OTA signal strength readings-are they accurate?

I've been OTA (with a Tivo Roamio) since January when I ditched Comcast. Have had periodic issues (when the weather is bad) with pixellation and audio dropouts which I attribute in part to the trees between me and the towers and also due to the 45 year old twinlead from my antenna. Since I can do nothing about the trees, I decided to replace the twinlead with RG6. (The antenna is chimney mounted about 25' above grade.)

With twinlead, only 3 of the 8 channels (not including sub-channels) I receive would reach the max steady state Tivo reading of 72. With RG6, all 8 read 72 with three starting out about 85 before settling back to 72 (which I understand is the AGC kicking in.) I attached the antenna cable directly to the TV input and got signal strength readings from 95-98 and SNRs from 30-32 from the TV diagnostics menu. I had not done this with the twinlead.

If the Tivo reading is accurate, signal strength has definitely improved due to the RG6. What is the collective wisdom here? Is the Tivo signal strength output accurate enough to confirm that the RG6 is giving me a stronger signal at the signal? I have not had any lousy weather to see if it's more immune to interference.


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