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post #10321 of 10322 Unread Today, 03:08 PM
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Originally Posted by Smoke_signal View Post

The KCRA/KMAX/KQCA broadcast antenna is the highest gain/narrowest beam antenna in all of California, easily affected by inversions and cut off by the foothills. It is also the only panel antenna in the Sacramento region. The panel design provides varying signal strength and beam width, varying for the 3 different transmission frequencies and varying with the horizontal angle from the antenna resulting in areas that lack reception for one or all 3 different stations as the antenna is circled. It is the worst possible broadcast antenna choice for the region served, and Hearst seems to have no cares about this issue.

Get used to watching NBC shows over the internet if you have DSL, or try KSBW channel 8 or KNTV channel 11 if the weather cooperates.
Thanks. I will record off the other NBC affiliates as a backup. I should go through the scheduled recordings on my HTPC anyway to make sure that priorities are set for each show.
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post #10322 of 10322 Unread Today, 05:07 PM
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Originally Posted by Larry Kenney View Post
It's interesting to point out that those three stations have the strongest signals into San Francisco, usually 3 or more dB stronger than KOVR and the two VHF channels.


Their antenna, like most broadcast antennas has a downward tilt to the main lobe. In this case 0.75°. That puts the center of the main lobe at the horizon 60 miles out where the most power is needed. You're about 60 miles from Walnut Grove and low elevation so it's working like they want. Those of us in the foothills at 2000' and higher are above the main lobe and get less ERP than you do. When the inversions set up and bend the signals down, we see less ERP as we're even farther out the main lobe. The only real solution for us is for the broadcasters to use lower gain antennas with broader vertical lobes so when the signal is bent down we don't see such a big drop in ERP. KVIE has the lowest gain antenna at Walnut Grove and I've never seen them drop out. They go up and down but a much smaller swing in strength than any of the UHF stations.

I have little trouble with Fremont Peak, Mt. Toro and the Fremont sites. Signals mostly go up from nominal and not down very often. Those transmitters are higher than I am. Sutro Tower is also hard here because it has to pass over the top of Mt. Diablo. Sutro transmitters also have a downward tilt. It's the same sort of problem since the top of Mt. Diablo is above the main lobe. Inversions set up and signals go down. Sutro goes down way more often than it goes up.

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