Hi all - hopefully this is the right place to post this. A little background:
Dropped cable TV (ATT U-Verse, actually) a month or so ago. So far, so good - very happy with my decision.
I live in Orange County - Costa Mesa - and discovered that I can get very good reception overall with relatively little effort - i.e.: by literally just sticking a flat (Winegard FlatWave) antenna on the wall in my office. I have 3 devices connected to this antenna through a ChannelMaster distribution amplifier. The devices are 2 Sony TVs and a Home Theater PC (Hauppauge WinTV-2250 dual tuner card).
Here's my problem/question: the Sony TV and HTPC in my office (upstairs) both get excellent reception with very few to no glitches, dropouts, etc. The Sony TV downstairs in my primary viewing area, gets good reception, but with lots of random glitches & (mostly audio) dropouts on pretty much all channels with the exception of KTTV, channel 11.1 - it's solid/stable on both TVs.
I'm running the antenna through my home coax from upstairs, to drive the Sony TV downstairs, so my first thought was that this was the problem - bad wiring. So I took the wiring out of the equation by connecting an antenna directly to the TV downstairs and it still exhibits the same glitches/dropouts. So it's not the wiring.
I reconnected the antenna to all 3 devices, and using the signal diagnostics on both Sony TVs, I observed the following:
- Signal to noise (SNR) is almost identical on both TVs
- AGC is reading around 60% higher on the TV upstairs (closer to the antenna) than the one downstairs (ex.: channel 2.1 is 34 downstairs and 55 upstairs)
- Signal strength is also pretty much the same - slightly higher (as expected) upstairs, but very strong downstairs - ex.: channel 2.1 is 85 upstairs and 82 downstairs. All other channels are similar differences between upstairs and downstaris.
So to sum up, SNR and signal strength are basically the same - the only metric that's significantly different is AGC. And I really don't understand what impact that has on reception and whether a lower AGC number would cause the dropouts I'm experiencing. I thought SNR was the critical metric...
Sorry for the long post - would like to hear any/all thoughts on all this & if anyone has any ideas about what could be causing the glitches on my TV downstairs, and better yet, if anyone has any ideas on how to eliminate them!!
Thanks for your help!