2012_07_21_great-blue-hill_21 : 無料・フリー素材/写真
2012_07_21_great-blue-hill_21 / Nfrastructure
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | The WGBH/89.7 transmitter site atop Great Blue Hill (after which the station is named), in the Blue Hills Reservation, Milton, Mass, overlooking Boston from the south. On top is WGBH's eight-bay, full-wave-spaced SHP-8AC antenna, putting out 100kw, with 98kw toward the horizon. It was replaced (story here in 2015 with a new ERI SHPX-8AC. Says that last link, "The eight-bay was chained to a 100-foot tapered pole mounted on a 130-foot Dresser self-supporting tower built for WGBH(TV) 2 in 1954. The pole diameter was more than 20 inches at the bottom and shrank to 6 inches at the top. Complex pattern distortions would result from pole and antenna flexing in moderate winds, especially the upper part of the taper." The pole was replaced by a 100-foot lambda tower also made by ERI. The 3-bay antenna below the 8-bay is WGBH's Shively 6810-3R-SS-PS. Below that is the 2-bay Shively antenna of WKAF/97.7fm. |
| 撮影日 | 2012-07-21 15:44:09 |
| 撮影者 | Nfrastructure |
| タグ | |
| 撮影地 | |
| カメラ | Canon EOS 5D , Canon |
| 露出 | 0.002 sec (1/500) |
| 開放F値 | f/13.0 |
| 焦点距離 | 85 mm |