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post #10321 of 10324 Old 01-24-2015, 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.

Larry

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 outside 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.

Chuck

Last edited by Calaveras; 01-24-2015 at 08:23 PM.
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post #10322 of 10324 Old Today, 12:22 PM
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KVIE has now added the previously mentioned fourth subchannel. KVIEWLD (PBS World) is now on 6.3 and KVIEVme has been bumped up to 6.4.

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post #10323 of 10324 Unread Today, 01:18 PM
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Originally Posted by Rory Boyce View Post
KVIE has now added the previously mentioned fourth subchannel. KVIEWLD (PBS World) is now on 6.3 and KVIEVme has been bumped up to 6.4.
6.2 and 6.3 are 16:9 full screen and look fine. 6.4 is letter boxed and therefore is horizontally stretched. I either have to zoom it to fill the screen or set it to "FULL" for 16:9 window box to get the correct aspect ratio. Looks like 6.4 has the lowest bit rate as I saw some motion artifacts.

Why is it so hard for these stations to get this right?

Chuck
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